The principle and use of a pattern generation the real time power control of an RF station are described. This station is situated just behind the extraction line of an accelerator ring. The RF signal depends on the bundle. During injection, the power swi...
National Technical Information Service (NTIS)
All Accelerator-Driven Transmutation applications require very large amounts of RF Power. For example, one version of a Plutonium burning system requires an 800-MeV, 80-mA, proton accelerator running at 100% duty factor. This accelerator requires approximately 110-MW of continuous RF power if ...
Energy Citations Database
The LHC RF station-beam interaction strongly influences the longitudinal beam dynamics, both single bunch and collective effects. Non-linearities and noise generated within the Radio Frequency (RF) accelerating system interact with the beam and contribute to beam motion and longitudinal emittance blowup. Thus, the ...
DOE Information Bridge
This report discusses the analysis and design of rf cavities and rf power sources in accelerators. (LSP).
In the X-band accelerator system for the Next Linear Collider Test Accelerator (NLCTA), the Low Level RF (LLRF) drive system must be very phase stable, but concurrently, be very phase agile. Phase agility is needed to make the Stanford Linear Doubler (SLED) power multiplier systems Energy work and to shape the RF ...
An experimental station for an X-band Next Linear Collider has been constructed at SLAC. This station consists of a klystron and modulator, a low-loss waveguide system for rf power distribution, a SLED II pulse-compression and peak-power multiplication system, acceleration sections and beam-line components (gun, ...
The ever present demands for high efficiency in the RF power stations for particle accelerators have caused increased interest in longer RF pulses (ten's of microseconds) for linacs such as the Pion Generator for Medical Irradiation (PIGMI) and Free Electron Laser (FEL). For either RF ...
The 476 MHz accelerating cavities currently used at SLAC are those installed on the PEP-II B-Factory collider accelerator. They are designed to operate at a maximum accelerating voltage of 1 MV and are routinely utilized on PEP-II at voltages up to 750 kV. During the summer of 2003, SPEAR3 will undergo a substantial upgrade, part of ...
... CHARGING IN RF MEMS CAPACITIVE SWITCHES (PREPRINT) ... Page 4. Acceleration of Dielectric Charging in RF MEMS Capacitive Switches ...
DTIC Science & Technology
Design and discussion are given on the complete radiofrequency system for the Princeton synchrotron and also on the drift tube system, cavity system, cavity bias system, phase detectors, accelerating station, and the master oscillator. The synchrotron floor plan is given along with a block diagram of the complete r-f system. ...
Beam Control Electronics for the Low Energy Booster (LEB) should provide a fine reference phase and frequency for the High Power RF System. Corrections applied on the frequency of the rf signal will reduce dipole synchrotron oscillations due to power supply regulation errors, errors in frequency source or errors in the cavity voltage. It will allow ...
A system for canceling varying phase changes introduced by connecting cables and control equipment in an alternating gradient synchrotron is presented. In a specific synchrotron embodiment twelve spaced accelerating stations for the proton bunches are utilized. In order to ensure that the protons receive their boost or kick at the exact instant ...
DOEpatents
The longitudinal beam dynamics in circular accelerators is mainly defined by the interaction of the beam current with the accelerating Radio Frequency (RF) stations. For stable operation, Low Level RF (LLRF) feedback systems are employed to reduce coherent instabilities and regulate the ...
The RF control system for a charged-particle accelerator must maintain the correct amplitude and phase of RF field inside the accelerator cavity in the presence of perturbations, noises, and time varying system components. For an accelerator with heavy be...
In support of X-band photoinjector development efforts at LLNL, a 50 MW test station is being constructed to investigate structure and photocathode optimization for future upgrades. A SLAC XL-4 klystron capable of generating 50 MW, 1.5 microsecond pulses will be the high power RF source for the system. Timing of the laser pulse on the photocathode with the ...
The research into advanced acceleration concepts for electron linear accelerators being pursued at SLAC is reviewed. This research includes experiments in laser acceleration, plasma wakefield acceleration, and mmwavelength RF driven accelerators.
The AWA is a new facility primarily designed for wakefield acceleration experiments at the 100 MV/m scale, which incorporates a high current linac and rf photocathode electron source, a low emittance rf electron gun for witness beam generation, and associated beamlines and diagnostics. The control system is based on VME and CA-MAC ...
We seek to develop accelerator-driven subcritical (ADS) nuclear power stations operating at more than 5 to 10 GW in an inherently safe region below criticality, generating no greenhouse gases, producing minimal nuclear waste and no byproducts that are useful to rogue nations or terrorists, incinerating waste from conventional nuclear reactors, and ...
NASA Astrophysics Data System (ADS)
An active tuning method for rf cavities for accelerators is investigated. First tests of the method at low power levels are reported.
... DIELECTRIC-CHARGING EFFECTS IN RF MEMS CAPACITIVE SWITCHES (PREPRINT) ... Charging Effects in RF MEMS Capacitive Switches ...
This thesis deals with the transport and acceleration of intense ion beams in single-ended Van de Graaff accelerators and the multiple beam rf accelerator MEQALAC (Multiple Electrostatic Quadrupole Array Linear Accelerator). Ch. 2 discusses several beam-e...
Fundamental power couplers for RF particle accelerators are the most important components that interface with the accelerating structures. In the case of superconducting cavities, the main function of providing the appropriate amount of power to the cavit...
The properties of rf power manifolds for use in a radio frequency quadrupole accelerator are discussed in the context of a coupled-circuit model. (GHT)
Project status of the 3He^++ 10.5 MeV RFQ Linear Accelerator for the production of PET isotopes will be presented. The accelerator design began in September of 1995 with a goal of completion and delivery of the accelerator to BRF in Shreveport, Louisiana by the summer of 1997. The design effort and construction is concentrated in Lab G ...
... Accelerator Technology II, RF, Power Supplies, Operations; Linear Accelerators and Pulsed Power Devices; Linear Colliders; and CERN plans for ...
In linear accelerators the particles are accelerated by either electrostatic fields or oscillating Radio Frequency (RF) fields. Accordingly the linear accelerators are divided in three large groups: electrostatic, induction and RF accelerators. Overview of the different ...
In the linear accelerators the particles are accelerated by either electrostatic fields or oscillating radio frequency (RF) fields. Accordingly the linear accelerators are divided by three large groups: electrostatic, induction and RF accelerators. Overview of different ...
A free electron laser system and electron beam system for a free electron laser which use rf feedback to enhance efficiency. Rf energy is extracted from an electron beam by decelerating cavities and returned to accelerating cavities using rf returns such as rf waveguides, ...
The growth rates of the longitudinal higher-order impedance-driven beam modes have greatly increased since the initial PEP-II design and commissioning. This increase is attributed to the addition of 6 1.2MW RF stations with 8 accelerating cavities in the ...
This report is the third in a series that describes the results of tests on full-scale pavements at the Richmond Field Station (RFS) which were designed and constructed according to Caltrans procedures. The report contains a summary of the results and int...
A radio-frequency quadrupole (RFQ) linear accelerator has been constructed and placed in operation on the Los Alamos National Laboratory accelerator test stand (ATS). This accelerator uses an evacuated rf manifold to distribute rf excitation from the 425-...
... ACCELERATION, RESISTANCE, ENERGY, NUMERICAL ANALYSIS, CAVITIES, FREE ELECTRONS, ELECTRON ENERGY, PUMPING ...
... joint planning, national and international ... I. FARAD: Faraday Accelerator with RF ... PROPULSION, *ELECTROSTATIC ACCELERATORS, *PLASMA ...
Detailed results of estimations and simulations for the RF kick caused by input and HOM couplers of the ILC acceleration structure are presented. Results of possible beam emittance dilution caused by RF kick are discussed for the main LINAC acceleration structure, and the RF structures of the ...
The principle and use of a pattern generation the real time power control of an RF station are described. This station is situated just behind the extraction line of an accelerator ring. The RF signal depends on the bundle. During injection, the power switches three times stepwise from zero to ...
A stand-alone 200 MW rf test station is needed for carrying out development of accelerator structures and components for a future high-gradient multi-TeV collider, such as CLIC. A high-power rf window is needed to isolate the test station from a structure element under test. This project ...
The Beam Experiments Aboard Rockets (BEAR) accelerator experiment imposes several nonstandard requirements on the rf control system. The experiment is entirely hands-off and must operate under local computer control. The rf control system must be extremel...
... was for use in designing telemetry equipment for buoys at sea and for command receiving stations on shore. The receiving site was located in ...
orbits & clocks to check for any abnormal behavior of the stations. .... how different strategies in handling constraints on RF defining stations ...
NASA Website
This paper describes the performance of the RF systems on the Ground Test Accelerator (GTA). The RF system architecture is briefly described. Among the RF performance results presented are RF field flatness and stability, amplitude and phase control resolution, and control system bandwidth and ...
RF facility (MOLC) of the Manned Spacecraft Operations Building. .... station at MOLC as well as being observed at the GMIL monitor ...
... Wave Generation Via a Free Electron Laser. ... Wave Gain; Solenoid; Accelerator; Harmonic ... FREE ELECTRON LASERS, ACCELERATED TESTING ...
Increasing the power handling capabilities of rf components is an important issue for the design of rf accelerators and rf sources. RF breakdown is a phenomena that limit the high power performance. A major concern is the damage that can occur in rf components from ...
The TESLA project proposed by the TESLA collaboration in 2001 is a 500 to 800GeV e+/e- linear collider with integrated free electron laser facility. The accelerator is based on superconducting cavity technology. Approximately 20000 superconducting cavities operated at 1.3GHz with a gradient of 23.4MV/m or 35MV/m will be required to achieve the energy of 500GeV or 800GeV ...
The PHERMEX accelerator is a standing wave, 50 MHz rf linear accelerator. The rf fields in three cavities are pulsed for a period of 3 ms. The experiments described are directed toward studying injection and trapping of electron rings at modes field stren...
Several practical aspects of rf acceleration (by a MEQALAC accelerator, for example) of positive and negative ions for MFE neutral injection were considered. The beam transport, gas flow, differential pumping, and compatibility with MFE beam lines were ex...
In the past, linear accelerators at frequencies below 3 GHz have been driven by klystrons or gridded tubes, with most of the small electron accelerators using conventional magnetrons. During the past few years, there have been several new rf amplifier dev...
Funnels are a key component of accelerator structures proposed for transmutation technologies. In addition to conventional accelerator elements, specialized rf-cavities are needed for these structures. Simulations were done to obtain their electromagnetic...
The Low Energy Demonstration Accelerator (LEDA) being constructed at Los Alamos will serve as the prototype for the low energy section of the Accelerator Production of Tritium (APT) accelerator. The APT accelerator requires over 200 RF systems each with a continuous wave output power of 1 MW. ...
A coupled cavity accelerator (CCA) accelerates a charged particle beam with rf energy from a rf source. An input accelerating cavity receives the charged particle beam and an output accelerating cavity outputs the charged particle beam at an increased energy. Intermediate ...
Results of experimental studies of the effect of an external RF field on the excitation of oscillations in a magnetoplasmadynamic plasma accelerator are presented. It is found that applying an RF field can suppress the drift component of low-frequency oscillations in the ejected plasma flow. The experimental data agree with the concept ...
The new low level rf system for the light ion acceleration program features direct digital control of a phase continuous rf synthesizer clocked by finite changes in the B field. The system, its operation and testing are described. The system covers the complete rf frequency range and switches over from single ...
The use of present Digital Signal Processing (DSP) techniques can drastically reduce the residual rf amplitude and phase error in an accelerating rf cavity. Accelerator beam loading contributes greatly to this residual error, and the low-level rf field control loops cannot completely absorb the ...
The scope of accelerator applications of rf superconducting devices is briefly discussed from a historical perspective. Current projects and development activity are outlined. 56 refs., 4 figs.
Although RF accelerated life testing of the RF devices would be optimal, it is quite ..... and compound semiconductor devices such as Gallium Nitride (GaN) FETs ...
As the space-charge limit is approached, the current that can be accelerated in an rf linac and the output emittance that can be expected are discussed. The role of the envelope equations to estimate limits is outlined. The results of numerical experiment...
An active tuning method for rf cavities for accelerators is investigated. First tests of the method at low power levels are reported. (ERA citation 08:021527)
The UV Free-Electron Laser (UVFEL) and The TeV-Energy Superconducting Linear Accelerator (TESLA) projects will require phase synchronization of 0.1 ps short term (millisecond), 1 ps short term (minutes) and 10 ps long term (days). The stringent synchronization requirement of 10fs was given for the X-Ray Free- Electron Laser (XFEL). To fufill this requirement the XFEL may use a ...
The Advanced Photon Source (APS) injector includes an S-band linac with the capability to accelerate beams to 650 MeV. The linac has recently been upgraded with the installation of an rf thermionic gun in addition to the standard DC thermionic gun. The rf gun is predicted to have lower emittance (5{pi}mm mrad) and may be used to ...
The Gap Voltage Feed-Forward (GVFF) Module produces adaptively generated inphase (I) and quadrature (Q) reference signals for a single RF station. This module measures the periodic (1-turn) beam induced cavity transients caused by the presence of an ion clearing gap in the beam. A reference waveform is generated to minimize the direct feedback error signal ...
This invention is comprised of an RF transport system which delivers a phase-stable RF signal to a load, such as an RF cavity of a charged particle accelerator. A circuit generates a calibration signal at an odd multiple frequency of the RF signal where the calibration signal is superimposed ...
An RF transport system delivers a phase-stable RF signal to a load, such as an RF cavity of a charged particle accelerator. A circuit generates a calibration signal at an odd multiple frequency of the RF signal where the calibration signal is superimposed with the RF signal ...
Stations (EPGS). The RF interfaces between the EOS-PM1 Spacecraft and the EPGS are defined in a separate RF Interface Control Document (ICD) referenced ...
Two rf coaxial couplers that are particularly suitable for intertank connection of the disk-and-washer accelerating structure for use in high-intensity linear accelerators have been developed. These devices have very high coupling to the accelerating structure and very low rf power loss at the ...
This paper covers RF power sources for accelerator applications. The approach has been with particular customers in mind. These customers are high energy physicists who use accelerators as experimental tools in the study of the nucleus of the atom, and synchrotron light sources derived from electron or positron storage rings. This ...
Cost considerations in the design of high energy (TeV) accelerators have lead to the development of linear supercollider technology which is based upon higher rf (GHz) systems which can increase the accelerating gradient and reduce the size of the accelerating structure. Scaling of GHz rf ...
The growth rates of the longitudinal higher-order impedance-driven beam modes have greatly increased since the initial PEP-II design and commissioning. This increase is attributed to the addition of 6 1.2MW RF stations with 8 accelerating cavities in the HER and 2 1.2MW RF stations with 4 ...
EMMA is an experiment to study beam dynamics in fixed field alternating gradient accelerators (FFAGs). It accelerates the beam in about 10 turns using 1.3 GHz cavities in a mode like that used for muon accelerators. Many applications of FFAGs prefer to have slower acceleration, typically thousands of turns. To do ...
An accelerator facility dedicated to ion beam materials analysis and modification has been completed at the Environmental Molecular Sciences Laboratory (EMSL), a United States Department of Energy collaborative scientific user facility located at the Pacific Northwest National Laboratory in Richland, WA. The EMSL accelerator facility is based on a Model ...
Bunch length and energy-z correlation measurements were performed on the high energy (28.5 GeV) electron test beam of the A-line and End Station A (ESA) facilities at the SLAC National Accelerator Laboratory. The longitudinal profile of each bunch was measured by imaging the synchrotron light emitted as the electrons traversed a highly dispersive bend ...
The authors discuss tolerances and correction schemes needed to control single- and multi-bunch emittance in the NLC main linacs. Specifications and design of emittance diagnostic stations will be presented. Trajectory correction schemes appropriate to simultaneously controlling the emittance of a multibunch train and the emittance of individual bunches within the train will ...
Radio frequency (RF) quantities in and around an HVDC converter station were measured in the 0.1 to 5 MHz frequency range to provide baseline data for the formulation of a means to predict the RF performance of such stations. Spectral records were taken at selected points and traverses in the ...
Magnetic loop type input couplers are used for coupling rf power from waveguides to the storage ring cavities: In a high rf power and high beam current accelerating cavity, the change in beam loading results in high reflected power due to input rf mismatc...
A 600 MHz rf cavity has been mounted on a 40 keV beam line. Preliminary experiments showed that multipactor occurs. Rf processing could suppress this perturbation. It has been established that the beam induces the multipactor effect.
For an rf coupler of an rf system in high-quality transmission an analytical method may be applied to treat the design problem, if a coupling hole between cavities or waveguides is small enough. However, in most cases of accelerator engineering the dimens...
A limiting factor in the performance of the Los Alamos Advanced Free Electron Laser (AFEL) is the stability of the RF accelerating field. A high-performance low-level RF control system has been implemented that uses analog feedback and digital feed forwar...
The lasertron rf generator uses an rf-modulated laser beam to generate a tightly bunched electron beam that is accelerated by a dc power supply to the fractional megawatt region. The tightly bunched beam then crosses an output cavity where most of the kin...
Fast rf phase shifters may be needed, in powering a superconducting linac, between rf generators and accelerating cavities when one klystron feeds more than one cavity. The configuration with one klystron for many cavities needs orthogonal controls of mag...
Two reliability options, redundancy and operating margin, are examined to determine their effect on power system configurations using RF tube technology (klystron and klystrode) powered neutral particle beam (NPB) weapons. Redundancy is addressed by providing an additional RF tube identical to the tubes required to power an accelerator ...
The condition that r-f buckets of radio frequency accelerations in synchrotrons always have no empty space by virtue of the adiabatic damping of phase oscillations, is obtained by calculating the action integral of phase oscillations. This analysis is applied to make r-f voltage programming which minimizes the maximum ...
The next linear collider will require 200 MW of rf power per meter of linac structure at relatively high frequency to produce an accelerating gradient of about 100 MV/m. The higher frequencies result in a higher breakdown threshold in the accelerating structure hence permit higher accelerating gradients per meter ...
In order to determine the shielding structure around the Advanced Photon Source (APS) synchrotron and storage ring RF stations, the X-ray radiation has been measured in the near field and far field regions of the RF cavities during the normal conditioning...
... § 80.83 Protection from potentially hazardous RF radiation. Any license or renewal application...station that will cause exposure to radiofrequency (RF) radiation in excess of the RF exposure guidelines specified in §...
Code of Federal Regulations, 2010
One of the requirements of the HISTRAP RF accelerating system is that the frequency of the accelerating voltage for the cavity must keep in step with the change in the magnetic field. As the energy of the particle increases, the magnetic field is increase...
In a very general prospect we have analysed the practical performances of a RF linac having in mind a double purpose: a usual heavy ion accelerator running in a large range of masses for nuclear physics and a pulsed high current heavy ion accelerator whic...
The SSC will have a linear accelerator (Linac) and five synchrotron systems (three booster synchrotrons plus two main synchrotron rings which constitute the collider). The Linac consists of three major accelerating systems an rf Quadrupole (RFQ), a Drift ...
During the past several years, there has been tremendous progress on the development of the RF system and accelerating structures for a Next Linear Collider (NLC). Developments include high-power klystrons, RF pulse-compression systems and damped/detuned ...
A prototype of a superconducting focusing solenoid for use in an RF linac has been built and tested at Fermi National Accelerator Laboratory (FNAL). The solenoid is comprised of the main coil, two bucking coils, two dipole corrector windings, and a low ca...
This book contains the following topics: The LEP project, Superconducting RF cavities for accelerator application, Commissioning of super-ACO, Pulsed high-power beams, RF Power sources, Astrid, A storage ring for ions and electrons, Linear collider studies in Europe.
The AWA is a new facility primarily designed for wakefield acceleration experiments at the 100 MV/m scale, which incorporates a high current linac and rf photocathode electron source, a low emittance rf electron gun for witness beam generation, and associ...
The CEBAF accelerator is designed in a multipass racetrack configuration, with two 1497 MHz linear accelerator sections joined by independent magnetic transport arcs. Room temperature subharmonic rf separator cavities will be used on each independent arc ...
Use of fast electron beams (EB) for excitation of RF fields in slow-wave structures (SWS) of ion linear accelerators with cyclotron instability on the anomalous and normal Doppler effect is discussed. For realization of this procedure along SWS axis the e...
The operation of the Fermilab Main Ring and Tevatron rf systems for colliding beams physics is discussed. The changes in the rf feedback system required for the accelration of antiprotons, and the methods for achieving proper transfer of both protons and antiprotons are described. Data on acceleration and transfer efficiencies are ...
The laser acceleration of plasmoids is investigated theoretically. Preliminary studies suggest that this configuration, which is based on the forced oscillations of finite pieces of plasma contained in moving or vibrating r.f. wells, has very much simplif...
Theoretical foundation for a Wakefield Accelerator using rf cavities has been completed. Thus experiments are in the planning to test the numerical and analytical results determined. The computational work and the experiments being planned are discussed in this presentation. (AIP)
Experiments are planned at ANL to study a new accelerating concept that has been developed during the last few years named the WAKEATRON. This requires a very special, simple configuration of the beams and of the rf structure involved. The basic concepts ...
A measuring system at the table-top scale was developed for RF measurements of a muffin-tin accelerating structure operating at 32 times the SLAC frequency (2.856 GHz). Both perturbation and non-perturbation methods are employed to characterize the RF properties of a muffin-tin structure. Conventional bead pull measurements are ...
The fundamental aspects of high-brightness rf linacs are outlined, showing the breadth and complexity of the technology and indicating that synergism with advancements in other areas is important. Areas of technology reviewed include ion sources, injectors, rf accelerator structures, beam dynamics, rf power, and ...
Project status of the 3He{sup +}{sup +} 10.5 MeV RFQ Linear Accelerator for the production of PET isotopes will be presented. The accelerator design was begun in September of 1995 with a goal of completion and delivery of the accelerator to BRF in Shreveport, Louisiana by the summer of 1997. The design effort and construction is ...
High electric fields are obviously advantageous in powerful electron accelerators: for a given energy gain per particle, the device length is inversely proportional to the maximum field; and the maximum current is roughly proportional to the field. The tr...
... Accession Number : ADD342747. Title : Radio Frequency Linear Accelerators for NDT Applications: Basic Overview Of RF Linacs,. ...
Similar to the power leads of accelerator superconducting magnets, the power couplers of accelerator superconducting cavities are components that link room temperature to superfluid helium temperature for the purpose of energy transfer. Instead of conduct...
... Theoretical and Experimental Investigation of Electron Beam ... nature of the helical electron beam generated by ... RF accelerator, all electrons can be ...
Experimental work is now under way by collaborators at LLNL, SLAC, and LBL to investigate relativistic klystrons as a possible rf power source for future high-gradient accelerators. We have learned how to overcome our previously reported problem of high-power rf pulse shortening and have achieved peak rf power ...
Experimental work is now under way by collaborators at LLNL, SLAC, and LBL to investigate relativistic klystrons as a possible RF power source for future high-gradient accelerators. How to overcome the previously reported problem of high-power RF pulse shortening was solved and peak RF power levels of 290 MW were ...
. The bonding and brazing of the cells into structures were done in a hydrogen furnace for the NLC structures
E-print Network
... inch Berkeley cyclotron. Descriptors : *FREQUENCY MODULATION, *MODEL TESTS, *RADIOFREQUENCY, *CYCLOTRONS, ACCELERATION ...
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.
... ACCUMULATORS, CHARGED PARTICLES, CAVITY RESONATORS. Subject Categories : PARTICLE ACCELERATORS NUCLEAR PHYSICS & ...
... not contained in a pure He-Ne discharge, the ... is accelerated by the electric field of the RF ... in radio frequency excitation, mirror displacement, and the ...
technology. Current areas of work include advanced accelerators for industrial and medical applications, novel radio frequency (RF) structures, and instrumentation and...
Science.gov Websites
This report discusses work on advanced accelerators and beam dynamics at ANL, BNL, SLAC, UCLA and Pulse Sciences Incorporated. Discussed in this report are the following concepts: Wakefield acceleration studies; plasma lens research; high gradient rf cavities and beam dynamics studies at the Brookhaven accelerator ...
The Next Linear Collider Test Accelerator (NLCTA) being built at SLAC will integrate the new technologies of X-band accelerator structures and RF systems for the Next Linear Collider, demonstrate multibunch beam-loading energy compensation and suppression of higher-order deflecting modes, measure transverse components of the ...
At the Continuous Electron Beam Accelerator Facility (CEBAF), under construction in Newport News, Virginia, a superconducting, recirculating, cw linac will provide a nominal 4 GeV, 200 ¿A electron beam for distribution to simultaneous nuclear physics experiments in three end stations. As of August 1992, the 45 MeV injector with 18 supeconducting cavities ...
At the Continuous Electron Beam Accelerator Facility (CEBAF), under construction in Newport News, Virginia, a superconducting, recirculating, cw linac will provide a nominal 4 GeV, 200 �A electron beam for distribution to simultaneous nuclear physics experiments in three end stations. As of August 1992, the 45 MeV injector with 18 supeconducting cavities ...
The Relativistic Heavy Ion Collider (RHIC) requires a low noise rf source to ensure that beam lifetime during a store is not limited by the rf system. The beam is particularly sensitive to noise from power line harmonics. Additionally, the rf source must be flexible enough to handle the frequency jump required for rebucketing ...
More than 15 Japanese laboratories are dedicated to the advanced and compact accelerator development. Some use ultra-intense lasers and others use microwave concepts. As for the laser electron acceleration, the topics are the capillary acceleration and the mono-energetic acceleration. The laser ion ...
The Low Level RF (LLRF) system is the source of all of the rf signals required for an rf linear accelerator. These signals are amplified to drive accelerator and buncher cavities. It can even provide the synchronizing signal for the rf power for a synchrotron. The use of ...
The RF control system for a charged-particle accelerator must maintain the correct amplitude and phase of the RF field inside the accelerator cavity in the presence of perturbations, noises, and time varying system components. For an accelerator with heavy beam-loading, fluctuations in the beam ...
The RF control system for a charged-particle accelerator must maintain the correct amplitude and phase of RF field inside the accelerator cavity in the presence of perturbations, noises, and time varying system components. For an accelerator with heavy beam-loading, fluctuations in the beam ...
Some aspects of r-f acceleration of particles to above 10 Bev are briefly discussed; and technical problems such as the generation of very high r-f power in the uhf range, design and fabrication of high Q accclerating units, and beam control and loading are examined. (D.C.W.)
Protection of the accelerator RF system against break-downs is described. The protection operates in two modes: 1) locking the modulator till the end of the accelerating cycle immediately after the first break-down in the RF system to prevent avalanche br...
The Fusion Materials Irradiation Test (FMIT) accelerator requires several 600-kW rf systems to simultaneously supply rf power to a single accelerator tank. Each rf-system output must be carefully phase and amplitude controlled to achieve the proper system...
Funnels are a key component of accelerator structures proposed for transmutation technologies. In addition to conventional accelerator elements, specialized rf-cavities are needed for these structures. Simulations were done to obtain their electromagnetic field distribution and to minimize the rf-induced heat ...
The proposed arrangement of accelerator structures, waveguide feeds and klystrons is shown. A 50 MW klystron at 20-3C will provide power for the high-field capture section immediately following the target. About 1 meter downstream of this section there will be a standard girder of four 3.05-meter SLAC constant gradient accelerator sections. These will be ...
A feasibility study of a spallation neutron source based on a rapid-cycling synchrotron which delivers a proton beam of 2 GeV in energy and 0.5 mA time-averaged current at a 30 Hz repetition rate is presented. The lattice consists of 90-degree phase advance FODO cells with dispersion-free straight sections, and has a three-fold symmetry. The ring magnet system will be energized by 20 Hz and 60 Hz ...
The feasibility study of a spallation neutron source based on a rapid cycling synchrotron which delivers a proton beam of 2 GeV in energy and 0.5mA time-average current at a 30-Hz repetition rate is presented. The lattice consists of 90-degree phase advanced FODO cells with dispersion-free straight sections, and has a three-fold symmetry. The ring magnet system will be energized by 20-Hz and 60-Hz ...
Page 1. UNCLASSIFIED AD270 054 ARMED SERVICES TECHNICAL INFORMATION AGENCY ARLINGTON HALL STATION ...
A microcontroller for automation application is currently being developed. It is basically an ... RF automation demonstration held in ]une 1975 at the. Mars Station ...
To power distributed wireless sensor networks on bridges, traditional power cables or battery replacement are excessively expensive or infeasible. This project develops two power harvesting technologies. First, a novel parametric frequency-increased generator (PFIG) is developed. The fabricated PFIG harvests the non-periodic and unprecedentedly low frequency (DC to 30 Hz) and low ...
Experimental work is being performed by collaborators at LLNL, SLAC, and LBL to investigate relativistic klystrons as a possible rf power source for future high-gradient accelerators. We have learned how to overcome or previously reported problem of high power rf pulse shortening and have achieved peak rf power ...
Superconducting RF structures such as spoke resonators [1] have been developed which will accelerate very low velocity ions. This opens up the possibility for the use of these resonators in high power proton accelerators at energies as low as the output energies of typical RFQs. Most similar resonators have been used for the ...
Atommash Production Association's use of electron accelerators for defectoscopy of nuclear power station parts is described. The capabilities of LUE-15/15,000D and Linatron-2000 linear accelerators and B-18 betatron cyclical accelerator are described.
The Low Energy Demonstration Accelerator (LEDA) being constructed at Los Alamos National Laboratory will serve as the prototype for the low energy section of Acceleration Production of Tritium (APT) accelerator. The APT accelerator requires over 244 RF systems each with a continuous wave output ...
Two spectrometers have been added to the LCLS photoinjector beamline. The first one will be located close to the exit of the Photoinjector RF gun. With this diagnostic, we will measure beam energy, energy spread (correlated and uncorrelated), possibly deleterious structure in the longitudinal phase space induced by longitudinal space charge force, and slice thermal emittance ...
Radio frequency (RF) windows are historically a point where failure occurs in input power couplers for accelerators. To obtain a reliable, high-power, 350 MHz RF window for the Low Energy Demonstration Accelerator (LEDA) project of the Accelerator Production of Tritium program, ...
Using the dielectric wall accelerator technology, they are developing a compact induction accelerator system primarily intended for pulsed radiography. Unlike the typical induction accelerator cell that is long compared with its accelerating gap width, the proposed dielectric wall induction ...
... Title : The Correlation Between Accelerated Laboratory Corrosion Tests and Atmospheric Corrosion Station Tests on Steels,. ...
May 31, 2011 ... TITLE AND SUBTITLE: An Acceleration Measurement Capability on International Space Station Supporting Microgravity Science Payloads ...
One of the problems of providing beam feedback in a large accelerator is the lack of beam synchronous trigger signals far from the RF signal source. IF single bucket resolutions are required, a cable extending from the RF source to the other side of the accelerator will not provide a synchronous signal if the ...
The proposed Next Linear Collider contains a large number of linac RF systems with new requirements for wideband klystron modulation and accurate RF vector detection. The system will be capable of automatically phasing each klystron and compensating for beam loading effects. Accelerator structure alignment is determined by detection of ...
High frequency, high output power, and high efficiency RF sources have compelling applications in accelerators for high energy physics. The 26 GHz RF power extractor proposed in this paper provides a practical approach for generating high power RF in this particular frequency range. The extractor is designed to ...
Recent concerns with pressure vessel codes as they relate to the construction of superconducting linacs have raised questions about mechanical proprieties of materials used in their fabrication at cryogenic temperatures. Pressure vessel engineering codes will require demonstration of a level of safety equivalent to that provided by the various ASME pressure and piping codes, so low temperature ...
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 Fusion Materials Irradiation Test (FMIT) accelerator requires several 600-kW rf systems to simultaneously supply rf power to a single accelerator tank. Each rf-system output must be carefully phase and amplitude controlled to achieve the proper system performance. Two 80-MHz, 600-kW ...
The International Space Station is being developed by NASA and international partners as a versatile
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