A brief introduction of the microtron, a newcomer among high-energy X-ray units, and a comparison of the radiographic features of a microtron and a linear accelerator are reported. (Atomindex citation 08:310875)

... Title : INVESTIGATION OF THE ENERGY SPECTRA OF ELECTRONS ACCELERATED BY THE ELECTRIC FIELD OF A MICROTRON ...

In a microtron, the path length change from pass to pass is a fixed multiple of the RF wavelength, and the accelerating system can be reasonably well approximated as a single cavity. Under such circumstances it is possible to derive an analytical formula ...

The phase stability of bunches accelerated by a magnetron-driven microtron-injector of a terahertz Free Electron Laser (FEL) has been studied to optimize the microtron regimes providing good operation of the FEL. The study is based on a simulation of the ...

A comprehensive account of developments in the field of recirculating electron accelerators is presented. Chapters are included in the role of recirculation in electron acceleration, the conventional microtron, linear accelerators and recirculation, race-track microtrons, representative ...

By this modified version the RF generator and the accelerating cavity can be integrated and put, with the magnets and extractor, into an evacuated vessel cooled to superconductivity.

The phase stability of bunches accelerated by a magnetron-driven microtron-injector of a terahertz Free Electron Laser (FEL) has been studied to optimize the microtron regimes providing good operation of the FEL. The study is based on a simulation of the beam dynamics in the microtron considering 2-D motion of the ...

Superconducting cavities allow one to consider the c.w. operation of a microtron-type accelerator. Some of the theoretical results obtained are discussed. These results deal with the losses, the refrigeration energy, and the orbit current. (auth)

A variable energy (20-100 MeV) racetrack microtron (RTM) is under construction at ENEA (Italian Commission for Alternative Energy Sources) Accelerator Laboratories, Frascati, Italy. This machine, designed to serve as a driver for a free electron laser (FE...

A discussion of the desirable characteristics of an electron accelerator for radiotherapy is given, based on personal interviews with a number of radiotherapists and radiological physicists in the United States. It is quite possible that the racetrack microtron, in its fully-developed form, will meet these requirements at a price that is not ...

For radiation therapy at medium and high energies the circular and the racetract microtron are ideally suited electron accelerators. The fine energy definition of the electron beam from a microtron allows the use of beam transport from one accelerator to several treatment units. This possibility makes an ...

Three prototypes of the sector magnets for GeV Electon Microtron accelerators have been designed. One has been built and two are being constructed. The first is a full scale, 168 ton prototype for one-half of a 2 GeV Double Sided Microtron (DSM) sector ma...

A now method of generating high-energy x-rays using a microtron is described. The performance of a prototype machine for industrial radiography, which has an energy of 8 MeV with a radiation output of 1,500 rad/min at 1 meter from a 2 mm diameter focus is described. The microtron has special advantages of compactness and simplicity. (auth)

This paper describes a higher-order variant of the microtron which offers an attractive option for furnishing cw electron beams at 4 GeV. The accelerator is a six-sided microtron consisting of three dispersive straight sections and three dispersion-free straight sections of constant length where three linacs are located.

This paper describes a higher-order variant of the microtron which offers an attractive option for furnishing cw electron beams at 4 GeV. The accelerator is a six-sided microtron consisting of three dispersive straight sections and three dispersion-free s...

Electrons are accelerated to 185 MeV by a microtron. Then, they are injected into another microtron to boost the net energy up to a few GeV. Between the two microtrons both longitudinal and transverse phase-space matching are required. In this paper, we consider a longitudinal phase-ellipse matching which utilizes ...

Central axis depth absorbed dose distributions of the electron beam from a medical microtron accelerator have been measured. The measured distributions differ from those of existing betatrons and linear accelerators. A larger absorbed dose build-up and a sharper dose fall-off are obtained in close agreement with theoretical calcuations ...

The article describes the design of the mathematical model and automatic control system of the microtron (high frequency cyclic electron accelerator). This type of accelerator was controlled manually till now. The critical values have been set up empirically on the basis of the previous operational experiences. The designed automatic ...

The article describes the design of the mathematical model and automatic control system of the microtron (high frequency cyclic electron accelerator). This type of accelerator was controlled manually till now. The critical values have been set up empirically on the basis of the previous operational experiences. The designed automatic ...

Design objectives are proposed for a continuous beam 2 GeV electron accelerator. Various accelerator concepts are examined in light of these requirements. A double-sided microtron shows promise for yielding major savings in capital cost and excellent beam characteristics.

The collaboration between the Los Alamos National Laboratory and the National Bureau of Standards (NBS), started in 1979, has led to the development of an advanced c-w microtron accelerator design. The four 2380-MHz NBS accelerating structures, containing...

Longitudinal bunching properties of a classical microtron have been investigated by the numerical simulation of the longitudinal motion of accelerated electrons. The simulations were performed for the 12-turn microtron that has been used as an injector for the KAERI far infrared free electron laser. Based on the bunching properties of ...

This report presents highlights of major projects in the Accelerator Technology (AT) Division of the Los Alamos National Laboratory. Radio-frequency and microwave technology are dealt with. The p-bar gravity experiment, accelerator theory and simulation activities, the Proton Storage Ring, and the Fusion Materials Irradiation Test ...

In a microtron, the path length change from pass to pass is a fixed multiple of the RF wavelength, and the accelerating system can be reasonably well approximated as a single cavity. Under such circumstances it is possible to derive an analytical formula for the multipass beam breakup threshold current. The threshold current determined by numerical ...

A 100 MeV pulsed race-track microtron (RTM) has been in operation at the University of Lund since 1979/sup 1/. The RTM will now be used as an injector for a storage-ring/pulse-stretcher currently being built. The RTM with its injection, acceleration and extraction systems are described and the beam characteristics are discussed.

A six-sided hexagonal microtron has been chosen as the accelerator to generate the beams required to pursue a national research program at a CW 4 GeV electron laboratory. This option has the advantage of superior beam quality, low capital and operating cost, and promise of furnishing beams of several electron energies simultaneously. Only moderate rf power ...

The design and construction progress of a prototype rf system to drive the Los Alamos-NBS racetrack microtron (RTM) electron accelerator is described. The rf system requires 450-kW cw at 2380 MHz from a single klystron. The output from the klystron is split three ways to drive a capture section, a preaccelerator section, and the main ...

Accelerators used for medicine include synchrotrons, cyclotrons, betatrons, microtrons, and electron, proton, and light ion linacs. Some accelerators which were formerly found only at physics laboratories are now being considered for use in hospital-based treatment and diagnostic facilities. This paper presents typical operating ...

A brief overview of particle production facilities available in Czech Republic is given. In particular are described the facilities at the Nuclear Physics Institute in Rez near Prague, namely: an isochronous cyclotron, an electrostatic accelerator tandetron and a microtron. An outline of the main research projects carried out is included.

A brief overview of particle production facilities available in Czech Republic is given. In particular are described the facilities at the Nuclear Physics Institute in Rez near Prague, namely: an isochronous cyclotron, an electrostatic accelerator tandetron and a microtron. An outline of the main research projects carried out is included.

In the 15 to 100 GeV position electron Colliding Beam Machine (LEP) under study by the European Committee for Future Accelerators it is intended to use a 460 MeV accumulation ring (ACR) to collect a previously bunched beam of electrons or positrons before...

Rising interest in the nuclear physics community in a GeV C.W. electron accelerator reflects the growing importance of high-resolution short-range nuclear physics to future advances in the field. In this report major current problems are reviewed and the details of prospective measurements which could be made with a GeV C.W. electron facility are discussed, together with their ...

The FELs based on the RF accelerator-recuperator and the electron outcoupling is promising for obtaining average output power of hundreds of kilowatts. We present basic considerations for the system stability and performance optimization for this scheme.

Activities of the racetrack-microtron development programs are highlighted, one of which is being done in collaboration with the National Bureau of Standards and the other with the University of Illinois; the BEAR (Beam Experiment Aboard Rocket) project; ...

In connection with the assertions repeatedly appearing in the literature that electrons emitted during BETA decay or even accelerated in a microtron exert different effects on mirror isomers (antipodes), a detailed experimental investigation of the effect of electron irradiation of solid racemates and separated forms of optical isomers on their ...

Three prototypes of the sector magnets for GeV Electron Microtron accelerators have been designed. One has been built and two are under construction. The first is a full-scale 168-ton prototype for one-half of a 2 GeV Double Sided Microtron sector magnet. The successful fabrication and testing of the pole pieces for this prototype have ...

A microtron-injector (Proceedings of the 2001 Particle Accelerator Conference, USA, 2001, 2739) for the KAERI compact far infrared free electron laser (FIR FEL) facility has been upgraded to provide tuning of the FEL wavelength from 100?m to more than 300?m. The wide-band tunability of the radiation has been achieved by changing the kinetic energy of the ...

A magnetron-driven microtron injector has been developed for a terahertz free electron laser (FEL). An internal injection system was chosen for the microtron to achieve a compact and inexpensive design. The system provides acceleration of electrons with low emittance and energy spread that is highly important for the FEL. However, the ...

A miniature 12 MeV race-track microtron for medical applications is under construction at the Technical University of Catalonia in collaboration with several Spanish centers and companies and the Skobeltsyn Institute of Nuclear Physics of the Moscow State University. As a source of electrons a compact 3D on-axis electron gun with an off-axis cathode has been designed to allow ...

A method for compensating the effects of misalignment between deflecting magnetic fields and a linear accelerator in a race track microtron where properly injected and accelerated electrons travel along successive complete orbits numbered in sequence comprises the steps of generating on both sides of the linear ...

This report presents highlights of the major projects in the Accelerator Technology (AT) Division of the Los Alamos National Laboratory. The first section details progress associated with the accelerator test stand. Following sections cover achievements in accelerator theory and simulation, LAMPF II accomplishments, and updates on ...

Three prototypes of the sector magnets for GeV Electon Microtron accelerators have been designed. One has been built and two are being constructed. The first is a full scale, 168 ton prototype for one-half of a 2 GeV Double Sided Microtron (DSM) sector magnet. The successful fabrication and testing of the pole pieces for this prototype ...

Current trends in research in medium energy physics with electromagnetic probes are reviewed briefly and design objectives are proposed for a continuous beam 2 GeV electron accelerator. Various types of accelerator systems are discussed and exploratory designs developed for two concepts, the linac-stretcher ring and a double-sided ...

Current trends in research in medium energy physics with electromagnetic probes are reviewed briefly and design objectives are proposed for a national continuous beam 2 GeV electron accelerator. Various types of accelerator systems are discussed and exploratory designs developed for two concepts, the linac-stretcher ring and a modified ...

The design of high-intensity accelerators is described, using examples of machines being built at the Los Alamos National Laboratory. The major design problem with these accelerators is associated with control of beam loss when accelerator intensity is increased. Beam dynamics, beam loss, and the radio-frequency quadrupole structure ...

The collaboration between the Los Alamos National Laboratory and the National Bureau of Standards (NBS), started in 1979, has led to the development of an advanced c-w microtron accelerator design. The four 2380-MHz NBS accelerating structures, containing a total of 184 accelerating cavities, have been fabricated ...

A reliable injection system of the widely tunable microtron-based terahertz Free Electron Laser (FEL) has been developed and during last few years provides stable operation of the FEL for users. The system is based on the long-life thermionic cathode assembly using 2.5 mm-in diameter monocrystalline LaB{sub 6} emitter, heated by the tungsten cylindrical filament with the power ...

A magnetron-driven microtron injector has been developed for a terahertz free electron laser (FEL). An internal injection system was chosen for the microtron to achieve a compact and inexpensive design. The system provides acceleration of electrons with low emittance and energy spread that is highly important for the FEL. However, the ...

The Linear Accelerator Laboratory (LAL) of the Instituto de Fisica da Universidade de Sao Paulo (IFUSP) is building a two-stage racetrack microtron, which will generate continuous wave electron beams with energies up to 38 MeV. This paper describes the characteristics of the accelerator, and reports on the experimental equipment that ...

As various subsystems of the National Bureau of Standards/Los Alamos racetrack microtron accelerator are being brought on-line, we are gaining experience with some of the innovations implemented in the control system. Foremost among these are the joystick-based operator controls, the hierarchical distribution of control system intelligence, and the ...

A 2.7-m side-coupled linac has been built as part of the 5-MeV injector for the cw room-temperature racetrack microtron (RTM) being constructed in collaboration with the National Bureau of Standards (NBS). The linac is designed to accelerate the electron beam from 1 to 5 MeV with an accelerating gradient of 1.5 MeV/m. Fabrication of ...

A 2.7-m side-coupled linac has been built as part of the 5-MeV injector for the cw room-temperature racetrack microtron (RTM) being constructed in collaboration with the National Bureau of Standards (NBS). The linac is designed to accelerate the electron beam from 1 to 5 MeV with an accelerating gradient of 1.5 MeV/m. Fabrication of ...

Beginning in 1979, Los Alamos entered into a collaboration with the National Bureau of Standards (NBS) to develop an advanced cw microtron accelerator. The accelerating structures (one 0.9-m-long, one 2.7-m-long, and two 4.0-m-long) containing a total of 184 accelerating cavities have been fabricated and tuned to ...

The high power RF system of the NIST-LANL RTM has been tested at nominal full power levels and has accelerated electron beams successfully. RF stability and calibration measurements have been made using the accelerated electron beam. These measurements have been used to calculate the effective shunt impedance of the side- coupled ...

Activities of the racetrack-microtron development programs are highlighted, one of which is being done in collaboration with the National Bureau of Standards and the other with the University of Illinois; the BEAR (Beam Experiment Aboard Rocket) project; work in beam dynamics; the proposed LAMPF II accelerator; and the Proton Storage Ring. Discussed next ...

Highlights in beam dynamics, accelerator inertial fusion, radio frequency structure development, the racetrack microtron, CERN high energy physics experiment NA-12, and high flux radiographic linac study are reported. Selected proton Storage Ring activities and an update on the free electron laser are discussed. The fusion materials irradiation test ...

This report covers major projects in the Accelerator Technology (AT) Division of the Los Alamos National Laboratory. The first sections highlight activities related to beam dynamics, inertial fusion, structure development, the racetrack microtron, and the CERN high-energy physics experiment NA-12. Discussed next is the Fusion Materials Irradiation Test ...

A pilot experiment in the search for light gauge bosons at the spectrometer setup of the A1 collaboration at MAMI is presented. Light gauge bosons arise naturally in a wide range of theoretical approaches beyond the standard model and are in accordance with several pieces of experimental evidence not yet understood in the standard model. A first test measurement at MAMI showed that existing limits ...

In order to increase accessibility to the {mu}SR spectroscopy for people in various fields of science and engineering, a conceptual design study was made to realize a compact and inexpensive muon source by using 300-MeV electron microtron and a large-acceptance muon-capture. Advanced radiography imaging with muon spin probes will become possible for bio-medical studies, ...

The rf system for the National Bureau of Standards (NBS)/Los Alamos cw racetrack microtron is described. The low-power portion consists of five 75-W amplifers that drive two input ports in each of two chopper deflection cavities and one port in the prebuncher cavity. A single 500-kW klystron drives four separate 2380-MHz cavity sections: the two main ...

The high-power rf system for the National Bureau of Standards (NBS)-Los Alamos racetrack microtron (RTM) uses waveguide power splitters and waveguide phase shifters to distribute rf power from a single 500-kw cw klystron to four side-coupled accelerating structures. The amplitude and phase of each structure is controlled by a feedback system that uses the ...

The rf system for the National Bureau of Standards (NBS)/Los Alamos cw racetrack microtron is described. The low-power portion consists of five 75-W amplifiers that drive two input ports in each of two chopper deflection cavities and one port in the prebuncher cavity. A single 500-kW klystron drives four separate 2380-MHz cavity sections: the two main ...

The NBS-LASL racetrack microtron (RTM) is a joint project of the National Bureau of Standards (NBS) and the Los Alamos Scientific Laboratory (LASL). This is a new accelerator research project whose goal is to determine the feasibility of building a high-energy, high-current, cw electron accelerator using beam recirculation and ...

The facility for neutron-rich nuclei production, as a specific part of the project DRIBS - phase II, based on the use of photofission and the characteristics of microtron MT-25 as a source of bremsstrahlung photons are described. Target selection with regard to maximum yield production of strong neutron-rich fission products and with respect to its safety and availability is ...

... a microtron with a nonuniform magnetic field; Measurement of the magnetic field nonuniformity in a microtron with 30 orbits; Phase oscillations in a ...

The features of a new type accelerator with a magnetic system consisting of several sectors separated by weak intermedate fields are described. The magnetic system has two mutually perpendicular synmetric planes but does not possess either axial or central symmetry. All orbits of the particles cross at the same point in which is found the ...

A laboratory-size Free Electron Laser (FEL) driven by a classical S-band microtron fed by a 2.5 MW magnetron generates terahertz radiation tunable in a wide range. The FEL provides output pulse power of �50 W in the wavelength range of 100�300 ?m with a pulse duration of 2�4 ?s. The FEL parameters are available due to stabilization of the accelerated ...

Highlights of major projects in the Accelerator Technology Division of the Los Alamos National Laboratory are presented. The first section deals with the Fusion Materials Irradiation Test Facility's 2-MeV accelerator on which tests began in May, as scheduled. Then, activities are reported on beam dynamics, inertial fusion, structure development, the ...

The NIST-Los Alamos Racetrack Microtron (RTM) is designed to deliver a low-emittance electron beam of up to 0.5 mA cw over an energy range of 17 MeV to 185 MeV. Fed by a 5 MeV injector, the RTM contains two 180/degree/ end magnets that recirculate the beam up to 15 times through a 12 MeV RF linac. The linac, which operates in a standing-wave mode at 2380 MHz, has been tested ...

Implementation of low-energy injection schemes in race-track microtron (RTM) designs requires a better understanding of the longitudinal beam dynamics. Unlike the high-energy case a low-energy beam slips in phase with respect to the accelerating field phase so that the standard notion of synchronous particle is not applicable. In the article, we generalize ...

Electron accelerators for the frontiers of nuclear physics must provide high duty factor (gte 80) for coincidence measurements; few-hundred-MeV through few-GeV energy for work in the nucleonic, hadronic, and confinement regimes; energy resolution of ~ 10^-4; and high current (gte 100 zA). To fulfill these requirements new machines and upgrades of existing ...

The results of a testing program on the disk-and-washer (DAW) structure with tee supports are presented. These results have led to the design of a 2.4-m DAW linac for use as the preaccelerator section of the National Bureau of Standards (NBS)/Los Alamos racetrack microtron (RTM). This structure uses two tee supports for each pair of washers, instead of four, and the structure ...

Problems of development of microtron equipment and construction of microtrons at scientific centers of JINR country-members are discussed. Results of experimental conducted in microtron beams are presented in the directions of photonuclear reactions, fiss...

The first 22 MeV micron installation for radiation therapy is described with regard to the general design, the beam transport and the gantry. The first measurements of the electron depth dose curves indicate that the distributions obtained are superior to those of most betatrons and linear accelerators. For the same electron beam energy the depth of dose maximum and the 90 or ...

In this report the results of investigation of extremely low frequency(ELF) secondary electromagnetic radiation(SER) generated by beams of electrons of microtron MT-22S (E=13 MeV,average current I=1-10 mkA,t=2,5 mks, f=386 Hz) in residual gas in dielectric electronpipe(glass,diametr d=50mm,length 120m) have been expounded. Measurements ...

It is proposed that the conventional electron microtron may be converted into a high-energy accelerator for protons or electrons in the Bev range, and capable of very high currents. It would require a high-energy injector, e.g., an FFAG cyclotron, capable of supplying protons of energy above 500 Mev in a beam of high intensity and high quality. ...

MAMI (Mainz Microtron) is an electron accelerator consisting of a cascade of three race-track microtrons, with an output electron beam of 855 MeV and 100 ?A cw [1]. The first two stages (output energy 180 MeV) were operative for nuclear-physics experiments from 1983 to 1987 and have since been transferred to a new building. They will ...

As part of a joint accelerator research project with the Los Alamos National Laboratory, NBS is now building a 200 MeV, high current, CW racetrack microtron (RTM). Upon its completion, scheduled for 1984, the authors propose to use this machine to provide CW electron beams to nuclear physics experimenters, and also as the injector for a second stage RTM to ...

The high-power rf system for the National Bureau of Standards (NBS)-Los Alamos racetrack microtron (RTM) uses waveguide power splitters and waveguide phase shifters to distribute rf power from a single 500-kW cw klystron to four side-coupled accelerating structures. The amplitude and phase of each structure is controlled by a feedback system that uses the ...

Synchrotron radiation in the sector magnets of the 4-GeV microtron designed at the Argonne National Laboratory produces a small but noticeable distortion of the closed orbits of the system and a very-significant growth of the horizontal and longitudinal phase-space emittances. Because of the small apertures in the three 25-meter linacs, it is important that the expected growth ...

The ZGS was a facility, as well as an organization, where people got together to pursue a common goal of doing exciting science of the day. In this note, the authors describe notable events related to accelerators and accelerator people since the closing of the ZGS program some 15 years ago. Many of the same ZGS people have been carrying out the ...

The activities of Los Alamos Scientific Laboratory's (LASL) Accelerator Technology (AT) Division during the first six months of calendar 1980 are discussed. This report is organized around major projects of the Division, reflecting a wide variety of applications and sponsors. The first section summarizes progress on the Proton Storage Ring to be located between LAMPF ...

Depth doses of the scanning electron beams from the Saturne Therac-20 linear accelerator at nominal energies of 6,9,13,17, and 20 MeV were measured in polystyrene using a thin window parallel plate ionization chamber. Central axis depth dose curves are derived and are analyzed according to the method of Brahme and Svensson. For each of the five electron energies, values are ...

The NBS-LASL racetrack microtron (RIM) is a joint research project of the National Bureau of Standards and the Los Alamos Scientific Laboratory. The project goals are to determine the feasibility of, and develop the necessary technology for building high-energy, high-current, continuous-beam (cw) electron accelerators using beam recirculation and ...

To know how much misalignment is tolerable for a particle accelerator is an important input for the design of these machines. In particle accelerators the beam must be guided and focused using bending magnets and magnetic lenses, respectively. The alignment of the lenses along a transport line aims to ensure that the beam passes through their optical axes ...

The International Committee supported the proposal of the Chairman of the XVIII International Linac Conference to issue a new Compendium of linear accelerators. The last one was published in 1976. The Local Organizing Committee of Linac96 decided to set up a sub-committee for this purpose. Contrary to the catalogues of the High Energy Accelerators which ...

This report presents highlights of major projects in the Accelerator Technology Division of the Los Alamos National Laboratory. The first section deals with the Fusion Materials Irradiation Test Facility's 2-MeV accelerator on which tests began in May, as scheduled. Then, activities are reported on beam dynamics, inertial fusion, structure ...

Major projects of the Los Alamos National Laboratory's Accelerator Technology Division are discussed, covering activities that occurred during the last six months of calendar 1982. The first sections report highlights in beam dynamics, accelerator inertial fusion, radio-frequency structure development, the racetrack microtron, ...

The activities of Los Alamos National Laboratory's Accelerator Technology Division are discussed. This report covers the last six months of calendar 1980 and is organized around the Division's major projects. These projects reflect a wide variety of applications and sponsors. The major technological innovations promoted by the Pion Generator for Medical ...

The activities of Los Alamos Scientific Laboratory's (LASL) Accelerator Technology (AT) Division during the calendar year 1979 are highlighted, with references to more detailed reports. This report is organized around the major projects of the Division, reflecting a wide variety of applications and sponsors. The first section covers the Fusion Materials Irradiation ...

We present the analysis of experiment-specific measurements of the efficiency of the Glasgow Photon Tagging Spectrometer in the A2 Hall at the Mainz Microtron (MAMI C). The photon tagger is being used for Crystal Ball and TAPS experiments. MAMI C is a particle accelerator capable of producing energies of up to 1.604 GeV. Photons are produced from the MAMI ...

Reported in this article is the generation of unique polarized x-rays in the sub-MeV region by means of the Thomson backscattering of the Nd:YAG laser photon with a wavelength of 1064 nm on the 150 MeV electron from the microtron accelerator. The maximum energy of the x-ray photons is estimated to be about 400 keV. The total energy of the backscattered ...

Reported in this article is the generation of unique polarized x-rays in the sub-MeV region by means of the Thomson backscattering of the Nd:YAG laser photon with a wavelength of 1064 nm on the 150 MeV electron from the microtron accelerator. The maximum energy of the x-ray photons is estimated to be about 400 keV. The total energy of the backscattered ...

The use of high-energy electrons in radiation therapy has expanded and linear accelerators and microtrons have come into more frequent use beside the previously dominating betatrons. The properties of the clinical electron beams in present use are, therefore, greatly diversified and new characterizations are needed to describe the beam qualities for ...

A highly sensitive method based on the reaction ^{232}Th(\\gamma, n)^{231}Th (T_{1/2} = 25.5 h) is developed for determining thorium in soil and environmental samples with a thorium content at a level of 3x10^{-7} g/g. Samples were irradiated for 4 hours with a maximum photon energy of 24.5 MeV at a compact electron accelerator - the MT-25 microtron of ...

We have developed a Mott electron polarimeter for the Mainzer microtron (MAMI) accelerator in Mainz, Germany. At beam energies ranging between 1.0 and 3.5 MeV two double focusing magnet spectrometers collect elastically backscattered electrons from gold targets. In spite of the small spectrometer acceptance, a sufficient statistical efficiency is achieved ...

We have developed a Mott electron polarimeter for the Mainzer microtron (MAMI) accelerator in Mainz, Germany. At beam energies ranging between 1.0 and 3.5 MeV two double focusing magnet spectrometers collect elastically backscattered electrons from gold targets. In spite of the small spectrometer acceptance, a sufficient statistical efficiency is achieved ...

The possibility to develop multielemental activation analysis and production of some radionuclides widely used for the nuclear medicine, radiobiology and ecology monitoring at the linear electron accelerator (E{sub e}- = 75 MeV) of the facility IREN (FLNP, JINR) are considered. Based on the experimental data obtained at low energy (E{sub e}-<30 MeV) electron ...

Utilization of a microtron for multielement photon activation analysis of ferruginous laterites, soil and geological standards, iron-manganese nodules, meteorites and samples from superdeep drilled holes (h >= 7 Kms) was investigated. Interferences, cause...

The distributed intelligence control system for the NBS/LANL racetrack microtron (RTM) is now nearing completion with all major subsystems implemented and tested, thus providing some operating experience with most of the control system innovations. These ...

Application of bremsstrahlung and photoneutrons from a microtron for determining the chemical composition of stone and iron meteorites was investigated. Nearly 20 elements have been determined mostly by instrumental photon activation analysis, but instrum...

The design study of a double-sided microtron is presented. The result of beam-optic calculations in several sector-magnet configurations is described. Current limitation by beam backup is discussed.

The application of a photoneutron microtron for a nondestructive activation determination of uranium has been investigated in samples of the compound chemical composition. The resonance neutron flux density is 2x10 exp 7 n/cm exp -2 xs exp -1 in the activ...

A possibility to determine nearly 30 rock-forming and rare earth elements in tektites-Australites, Philippinites, Moldavites and glasses from Zhamanshin crater and an some basic rock types using microtron gamma-quanta and photoneutrons with the 10 exp -6 ...

This report covers the activities of Los Alamos National Laboratory's Accelerator Technology Division during the first 6 months of calendar 1981. We discuss the Division's major projects, which reflect a variety of applications and sponsors. The varied technologies concerned with the Proton Storage ring are concerned with the Proton Storage Ring are ...

Page 1. UNCLASSIFIED AD214 0+60 ARMED SERVICES TECHNICAL' INFORMIAION AGENCY ARLINGTON HALL STATION ...

... Accession Number : ADA163227. Title : Proposal for FEL Experiments Driven by the National Bureau of Standards' CW Microtron. ...

A series of tests was conducted on the 50-MeV-racetrack microtron at the Royal Institute of Technology in Stockholm, Sweden for the purpose of determining the quality of industrial radiographs generated by the bremsstrahlung beam of the machine. The results of the experiments indicate that radiographs with a spatial sensitivity better than those produced by more conventional ...

... MELEKHIN,VN ; SERGEEV,VA. Report Date : MAR 1980. Pagination or Media Count : 4. Abstract : THE ARTICLE DISCUSSES ...

The principal characteristics of a microtron or electron cyclotron are briefly reviewed. The construction of the magnet, vacuum chamber, and the radiofrequency installation is described. (J.S.R.)

At the Kansai Photon Science Institute of the Japan Atomic Energy Agency, we have developed a Compton backscattered X-ray source in the energy region of a few hundred keV. The X-ray source consists of a 150-MeV electron beam, with a pulse duration of 10 ps (rms), accelerated by a Microtron accelerator and an Nd:YAG laser, with a pulse ...

We report on the major projects of the Los Alamos National Laboratory's Accelerator Technology Division during the last 6 months of calendar year 1981. We have continued work on the radio-frequency quadrupole linear accelerator; we are doing studies of octupole focusing. We have completed the design study on an unusual electron-linear radiographic ...

A prototype rf beam monitor has been tested on the Racetrack Microtron's (RTM) 100 kV injector beam line at the National Bureau of Standards (NBS). This beam monitor is capable of measuring the current, the relative phase, and the position of the beam. The beam is bunched at 2380 MHz for acceleration by the linac in the injector beam line. This ...

Optical systems have been designed to contain the electrons during the acceleration from 0.185 to 4.0 GeV. These systems are located in the dispersive straight sections and maintain a matched dispersion-free beam with ..beta..* = 15.0 m in the linac centers, and transverse beam waists in the centers of the dispersive straight sections. A thin-lens code has been developed to ...

We have determined the isomeric ratios in photonuclear reactions 116Cd(?, n)115 m, g Cd, 138Ce(?, n)137 m, g Ce, 153Eu(?, n)152 m, g Eu, 96Mo(?, p)95 m, g Nb, 118Sn(?, p)117 m, g In, 89Y(?, 2 n)87 m, g Y, 106Cd(?, np)104 m, g Ag, and 112Sn(?, np)110 m, g In induced by bremsstrahlungs with end-point energies in the Giant Dipole Resonance (GDR) region. The targets were irradiated at electron ...

The scientific program at the Mainz Microtron (MAMI) is based on polarized electron and photon beams from the MAMI A-B-C accelerator complex with energies up to 1500 MeV. In order to deal with the energy increase, the photon tagger system has been extended and refurbished by the Glasgow University Nuclear Physics Group. It is now available for real photon ...

Polarization transfer in quasi-elastic nucleon knockout is sensitive to dynamical relativistic effects and to possible modification of the nucleon electromagnetic form factors in the nuclear medium. Although proper interpretation of the results requires accounting for effects such as final state interactions and meson exchange currents, their effect on polarization transfer is expected to be ...

The possibility of producing exotic 6He nuclei in the 7Li(?, p) reaction with 22 MeV electron beam at the MT-25 microtron in the Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research (FLNR JINR), is studied. The 6He yield from the Li2CO3 target made up 6 � 105 s?1 per 1 ?A of the electron beam current. The obtained result is quite promising, taking ...

Results are presented that were obtained by measuring the independent yields of Kr (A = 89 - 93) and Xe (A = 135 - 142) appearing as fragments in the photofission of {sup 237}Np and {sup 243}Am odd nuclei. The respective experiments were performed in a beam of bremsstrahlung photons from electrons accelerated to an energy of 25 MeV at the microtron of the ...

The effect of an 8 MeV electron-beam on the structural, optical and dielectric properties of polystyrene films has been investigated respectively by means of Fourier transform infrared (FTIR) spectroscopy, ultraviolet-visible (UV-VIS) spectroscopy and electrical impedance (LCR) analysis over a radiation dose in the range of 50-250 kGy using a Microtron ...

The proposed 4 GeV Electron Microtron (GEM) is designed to fill the existing buildings left vacant by the demise of the Zero Gradient Synchrotron (ZGS) accelerator. One of the six large dipole magnets is shown as well as the first 10 electron orbits. A 3-orbit prototype magnet has been built. The stepped edge of the magnet is to keep the beam exiting ...

Topics discussed include replacement of betatron with a racetrack microtron, development of tomography, cineradiography, and flash x ray, and new applications of flash x ray.

... Accession Number : ADA201170. Title : Free-Electron Laser Driven by the NBS (National Bureau of Standards) CW Microtron. ...

A scaled version of a typical disk loaded structure is compared with a proposed version of the disk and washer strucutre for the CW race track microtron application. (GHT)

... current and cancelled), Joint Staff and other US Military (ie, Army, Navy, Air ... sections, a beam current of 100 microamps at unity duty cycle is feasible ...

The neutron dose was measured in X-ray beams with a limiting energy of 8 to 45 MeV and in 42 MeV electrons (10 X 10 cm2) from several electron accelerators (betatrons, linear accelerators, microtron). The measurements were taken with activation probes and nuclear films of polycarbonate coated with 0,5 mm Cd. On a 42 MeV betatron, the ...

In the last year an upgrade of the Mainz electron accelerator MAMI has been started to reach a beam energy of 1.5GeV. Therefore a fourth stage (MAMI C), a harmonic double sided microtron (HDSM) with four normal conducting dipole magnets and two antiparallel linear accelerators is under construction. The A2-Glasgow-Mainz tagger can ...

The UMass group has concentrated on using electromagnetic probes, particularly the electron in high-energy scattering experiments at the Stanford Liner Accelerator Center (SLAC). Plans are also being made for high energy work at the Continuous Beam Accelerator Facility (CEBAF). The properties of this accelerator should permit a whole ...

The UMass group has concentrated on using electromagnetic probes, particularly the electron in high-energy scattering experiments at the Stanford Liner Accelerator Center (SLAC). Plans are also being made for high energy work at the Continuous Beam Accelerator Facility (CEBAF). The properties of this accelerator should permit a whole ...

Uranium analysis has been investigated by activation with 16 MeV bremsstrahlung from a microtron in samples of compound chemical composition (geological objects). The sensitivity of uranium determination is 1x10 exp -7 g/g in (30-60) min measurements by a...

Methods for a gamma-ray spectroscopy determination of natural radioactive elements and U and Th instrumental determination using bremstrahlung and photoneutrons generated at a microtron are described. The limit of the detection for U and Th is obtained to...

A prototype rf beam-position, current, and phase monitor has been used on the 100-keV injector beamline of the racetrack microtron (RTM) where performance was measured with the chopped and bunched beam. This monitor works with both a pulsed beam and a cw ...

The NIST-Los Alamos Racetrack Microtron (RTM) is designed to deliver a low-emittance electron beam of up to 0.5 mA cw over an energy range of 17 MeV to 185 MeV. Fed by a 5 MeV injector, the RTM contains two 180 degree end magnets that recirculate the beam...

A method of multielemental instrumental gamma activation analysis (IGAA) of copper-molybdenum ores and its production of processing using microtron bremsstrahlung is described. Activities of irradiated samples were measured by means of Ge(Li) and HP Ge-de...

An instrumental gamma-activation analysis of products of the current chemical source production was carried out on microtrons (Esub( gamma sub(max))=13.6 MeV) of the Saratov State University and Kiev Institute for Nuclear Research. An anode and cathode ma...

An electron microtron of the a = 3, b = l model has been built and its essential parts are described. Ten orbits have been obtained and the final energy of the particles is 2.5 Mev. The machine is at present without an extractor and therefore only gamma rays are available. The average intensity on the last orbits is some 10/sup -7/ A. (auth)

Raja Ramanna Centre for Advanced Technology (RRCAT, formerly called Centre for Advanced Technology) is a prime R and D laboratory of Indian Department of Atomic Energy devoted to developing technologies related to accelerators and lasers as well as their applications. RRCAT is home to 2 synchrotron radiation sources (SRS): Indus-1 (a 100 mA, 450 MeV storage ring) and Indus-2 ...

Raja Ramanna Centre for Advanced Technology (RRCAT, formerly called Centre for Advanced Technology) is a prime R&D laboratory of Indian Department of Atomic Energy devoted to developing technologies related to accelerators and lasers as well as their applications. RRCAT is home to 2 synchrotron radiation sources (SRS): Indus-1 (a 100 mA, 450 MeV storage ring) & Indus-2 ...

Compton backscattered x-ray source is developed in the energy region of a few hundred keV at Kansai Photon Science Institute of Japan Atomic Energy Agency (KPSI-JAEA). A remarkable feature of the Compton backscattered x-ray source is that the generated x-ray beam is a well-collimated and has a definite polarization property. The Compton backscattered x-ray source at KPSI-JAEA consists of the ...

Photon activation analysis (PAA) was introduced about contemporarily with the other activation analysis methods (neutron, NAA, and charged particle activation, CPAA). Nonetheless, for different reasons, PAA has been applied less frequently than the other techniques mentioned. The incident photon energy should exceed about 12 MeV (except in some special rare applications) so as to obtain ...

Photon activation analysis (PAA) was introduced about contemporarily with the other activation analysis methods (neutron, NAA, and charged particle activation, CPAA). Nonetheless, for different reasons, PAA has been applied less frequently than the other techniques mentioned. The incident photon energy should exceed about 12 MeV (except in some special rare applications) so as to obtain ...

The scientific program at the Mainz Microton (MAMI) is based on polarized electron and photon beams from the MAMI A-B-C accelerator complex. The scientific program at the Mainz Microtron (MAMI) is based on polarized electron and photon beams from the MAMI A-B-C accelerator complex with energies up to 1.5GeV. In order to deal with the ...

Since the conduction of the pioneering experiments concerning the free electron laser (FEL), new and more efficient FEL devices have been proposed, taking into consideration the relation between laser beam characteristics and electron beam sources. Electron beam sources can be divided into two categories, including single pass machines and devices in which the beam is recirculated. The design of a ...

The Twente Eindhoven microtron, a 25 MeV electron source for a 10 ?m free electron laser has inhomogeneous magnetic fields to improve the focusing properties of the microtron. In order to design the shape of the magnets, the fringe field properties like the effective field boundary and the defocusing force in the vertical plane, have been determined. In ...

The injector starts with a 5 MeV preinjector followed by an 18 MeV S-band linac. The 23 MeV electrons are transported and injected into a Racetrack Microtron via a 10/sup 0/ achromatic bend system. Twenty-seven turns are used to boost the energy to 185 MeV. Reverse-field stripes on the 180/sup 0/ end magnets and quadrupole focussing on the return paths maintain a ...

In the Cerenkov free-electron laser experiments, dielectric-loaded quasi-optic resonators were used to couple the electron beam to the electromagnetic field. Three types of electron beam generators were employed: a pulse-transformer-based modulator (which operates in the 50 to 250 KV range), a Marx generator (which operated in the 500 kv to 1.1 MV range), and a circular RF ...

The only available tabletop electron storage rings are the machines from the MIRRORCLE series. The electrons are accelerated in a microtron and injected into the storage ring. During its circulation, each electron passes through a tiny target many times, emitting a photon beam. Both the spectrum and the angular distribution of the radiation depend on the ...

A feasibility study of a CW positron source for the 12 GeV upgrade at Jefferson Lab (JLAB) is provided. The proposed � 100 nA Continuous Wave (CW) positron source at JLAB has several unique and challenging characteristics: high current incident electron beam at 126 MeV with a high beam power (up to a MW); CW e� beam and CW e+ production. The multiple scattering is a dominant process when ...

A feasibility study of a CW positron source for the 12 GeV upgrade at Jefferson Lab (JLAB) is provided. The proposed ? 100 nA Continuous Wave (CW) positron source at JLAB has several unique and challenging characteristics: high current incident electron beam at 126 MeV with a high beam power (up to a MW); CW e? beam and CW e+ production. The multiple scattering is a dominant process when ...

The micronucleus assay in human peripheral blood lymphocytes is a sensitive indicator of radiation damage and could serve as a biological dosimeter in evaluating suspected overexposure to ionising radiation. Micronucleus (MN) frequency as a measure of chromosomal damage has also extensively been employed to quantify the effects of radiation dose rate on biological systems. Here we studied the ...

Any technique that can detect nitrogen concentrations can screen for concealed explosives. However, such a technique would have to be insensitive to metal, both encasing and incidental. If images of the nitrogen concentrations could be captured, then, since form follows function, a robust screening technology could be developed. However these images would have to be sensitive to the surface ...

Lawrence's invention of the cyclotron, whose 80th anniversary we have just celebrated, not only revolutionized nuclear physics, but proved the starting point for a whole variety of recirculating accelerators, from the smallest microtron to the largest synchrotron, that have had an enormous impact in almost every branch of science and in several areas of ...

We describe an experiment to search for a new vector boson A' with weak coupling ?' ? 6 � 10-8 ? to electrons ( ? = e 2/4 ?) in the mass range 65 MeV < m A' < 550 MeV. New vector bosons with such small couplings arise naturally from a small kinetic mixing of the "dark photon" A' with the photon � one of the very few ways in which new forces can couple to the Standard Model � and have ...

The development over the last twenty years of the physics program and the experimental facilities at the Mainz Microtron MAMI will be reviewed. Ground-breaking contributions have been made to the development of experimental techniques and to our understanding of the structure of nucleons and nuclei.

The high-energy microtrons studied at Argonne National Laboratory (ANL) require complicated magnetic field shapes. A three-dimensional infinite-permeability magnetic field program was written to show that poles and coils can be devised to produce these fi...

The rf power system and its closed-loop feedback control for the racetrack microtron (RTM) chopper/ buncher system are described. Measurements made on the response of the feedback system to external perturbations are also reported.

& Applications, P.O. Box 17214, 10024 Athens, Greece H. Herminghaus, MAMI, Mainz, Germany A. Zolfaghari, MIT, attached in a "L" pattern to small ceramic standoffs on a metal frame [5]. Current from the wires (due

The rf power system and its closed-loop feedback control for the racetrack microtron (RTM) chopper/buncher system are described. Measurements made on the response of the feedback system to external perturbations will also be reported.

A prototype rf beam monitor has been tested on the Racetrack Microtron's (RTM) 100 kV injector beam line at the National Bureau of Standards (NBS). This beam monitor is capable of measuring the current, the relative phase, and the position of the beam. Th...

A free-electron laser (FEL) which will be driven by the cw racetrack microtron (RTM), will be operated as an oscillator with the fundamental wavelength variable from approximately 200 nm to 10 micrometers. The presence of harmonics should allow for operat...

The high power electron alaser (FEL) is under construction in the Novosibirst. The goal of this project is to provide the user facility for photochemical researches. 15 refs. (Atomindex citation 25:055675)

The photoproduction of mesons on light nuclei was studied intensively with the calorimeter TAPS at the tagged photon facility of the Mainzer Microtron MAMI. Threshold enhancements for ? production on light nuclei are summarized. Furthermore, the evidence of ?-mesic 3He is discussed.

Here we correct a factor of 2 missed in one of figures and the corresponding sentence in the text. It does not change any conclusions.

The question of the use of a reflector (water) in addition to a graphite moderator for the increase of the thermal neutron flux is considered. The diffusion method with four energy groups is used for the solution of the problem. The distribution of therma...

Application of bremsstrahlung and photoneutrons from a microtron for multielement activation analysis of samples of the Earth ancient crystallized rocks was investigated. Nearly 30 elements have been determined mostly by the instrumental photon activation...

At present, the first two stages (175 MeV) of the three-stage c.w. microtron cascade MAMI have been completed. The report concentrates on the design of the 2nd stage, which had been completed by the end of 1982 and which, so far, has not yet been described in detail elsewhere. First beam had been obtained by Feb. 1983, best beam transmission obtained so far is in excess of ...

A prototype rf beam-position, current, and phase monitor has been used on the 100-keV injector beamline of the racetrack microtron (RTM) where performance was measured with the chopped and bunched beam. This monitor works with both a pulsed beam and a cw beam. The pulsed beam consists of beam pulses with a FWHM of 40 ns. The rf beam monitor was tested with beam currents from ...

The feasibility of using bremsstrahlung and photoneutrons from a microtron to measure the chemical composition of stony and iron meteorites is demonstrated. Conditions are established for the activation determination of approximately 20 elements in meteorite samples without their destruction. The optimal geometry and mode of irradiation are established; the contribution of ...

Two end magnets have been designed and constructed for the 185 MeV NBS-Los Alamos racetrack microtron. The field has been measured in the first magnet and is uniform over a 0.62 m/sup 2/ area to within + or - 2 X 10/sup -4/ at 1 T. The magnet meets all performance specifications. Field measurements are underway on the second magnet. In this paper, design and construction ...

... Descriptors : *Linear accelerators, *Ion accelerators, *Particle accelerator components, *Electron accelerators, *Proton accelerators, Electron beams ...