For modern parity violation experiments it is crucial to measure and monitor the electron beam polarization continuously. In the recent years different high-luminosity concepts, for precision Compton backscattering polarimetry, have been developed, to be used at modern CW electron beam accelerator facilities. As Compton ...

... Abstract : A NEW AND SIMPLE BACK-SCATTER IMAGING SYSTEM, BASED ON THE DETECTION OF COMPTON SCATTERED RADIATION IS ...

... Title : Compton Back-Scattered Radiation Source. ... Descriptors : *X rays, *Sources, *Patents, Electron beams, Compton scattering. ...

... The effect of each of these parameters can be easily studied and optimized using a Compton backscattering simulation code. ...

... Report Date : FEB 1969. ... (Author). Descriptors : (*OCEAN BOTTOM SAMPLING, *COMPTON SCATTERING), COBALT, RADIOACTIVE ISOTOPES ...

... inspected. Aircraft components, Cameras, Spacecraft components, Compton effect. Nondestructive tests, X Ray inspection,. ...

A gamma Compton backscattering device is presented. It is shown that by fine-tuning several electronics parameters an image of recognizable geometry is obtained.

A gamma Compton backscattering device is presented. It is shown that by fine-tuning several electronics parameters an image of recognizable geometry is obtained.

... Accession Number : AD0689237. Title : COMPTON BACK-SCATTERED (CBS) SOFT X-RAY SOURCE. Descriptive Note : Technical rept. ...

... Compton scattering offers 3-D imaging comparable to CT but without requiring rotation of the part. ... Spacecraft components Compton effect 140201 ...

... energies up to some 100 keV, normally used in industrial x-ray inspection, the attenuation process is dominated by Compton scattering instead of ...

... instrument uses a very simple and compact one-source and one ... Several main technical problems to design a portable high resolution Compton ...

Backscatter x-rays are emitted (Compton Scattering), possibly after multiple subsequent scattering events, and detected by NaI or YSO detectors ...

Compton backscattering polarimetry provides a fast measurement of the polarization of an electron beam in a storage ring. Since the method is non-destructive, the polarization of the electrons can be monitored during internal target experiments. At NIKHEF...

We observed a continuous-spectrum light beam resulting from Compton backscattering by using coherent transition radiations from an L-band electron linear accelerator at the Kyoto University Research Reactor Institute. The measured spectrum of the Compton backscattered photons was similar to that calculated from the ...

Compton backscattering polarimetry provides a fast measurement of the polarization of an electron beam in a storage ring. Since the method is non-destructive, the polarization of the electrons can be monitored during internal target experiments. At NIKHEF a Compton polarimeter has been constructed to measure the polarization of the ...

In this paper we consider the x-ray production by Compton backscattering of intracavity visible free-electron laser (FEL) radiation. We discuss the interplay between the build-up of the laser in the cavity and the backscattered signal including the effects of the e-beam degradation (energy spread) induced by the FEL interaction.

We discuss the {gamma}{minus} ray production by Compton backscattering of intracavity S.R. FEL radiation. We use a semi-analytical model which provides the build up of the signal combined with the storage ring damping mechanism and derive simple relations yielding the connection between backscattered photons brightness and the ...

Radiotherapy utilizes photons for treating cancer. Historically these photons have been produced by the bremsstrahlung process. In this paper we introduce Compton backscattering as an alternate method of photon production for cancer treatment. Compton backscattering is a well-established method to produce ...

A Compton-recoil gamma spectrometer is described in which the gamma photons are collimated, strike a Lidrifted Si detector, and produce Compton electrons plus recoil gamma rays. The recoil gamma rays are detected at a prescribed backscattering angle, in coincidence with the Compton electrons, by a ...

A concept of high intensity femtosecond laser synchrotron source (LSS) is based on Compton backscattering of focused electron and laser beams. The short Rayleigh length of the focused laser beam limits the length of interaction to a few picoseconds. Howev...

Students use NaI/PMT gamma detectors to gather spectra of several radioactive sources. The full-enrgy peak, Compton edge, Compton shelf and backscatter peaks are identified. The physics of the detection process is emphasized.

This report discusses the theory and application of X-ray and gamma-ray backscatter to the problem of nonmetallic landmine detection. The fundamental interactions of X and gamma radiation with matter, including photoelectric absorption, Compton scattering...

A Monte-Carlo simulation of Compton backscattered (kappa)(sub L)=3.2-(mu)m photons from an IR-FEL on 75-MeV electrons in a storage ring yields an RMS electron energy spread of (Delta)(sub E)=11.9-keV for a sample of 10(sup 7) single scattering events. Ele...

The intense photon output of a free electron laser may be made to collide with its own high energy electron beam to create nearly monochromatic x-rays using Compton backscatter techniques. These x-rays can be used for imaging and nonimaging diagnostic and...

The density of the lung of a patient suffering from pulmonary edema is monitored by irradiating the lung by a single collimated beam of monochromatic photons and measuring the energies of photons compton back-scattered from the lung by a single high-resolution, high-purity germanium detector. A compact system geometry and a unique data extraction scheme ...

The density of the lung of a patient suffering from pulmonary edema is monitored by irradiating the lung by a single collimated beam of monochromatic photons and measuring the energies of photons Compton backscattered from the lung by a single high-resolution, high-purity germanium detector. A compact system geometry and a unique data extraction scheme are ...

Calculations of X-Ray production rates, energy spread, and spectrum of Compton-backscattered photons from a Free Electron Laser on an electron beam in a low energy (136-MeV) compact (8.5-m circumference) storage ring indicate that an X-Ray intensity of 34...

We discuss the (gamma)(minus) ray production by Compton backscattering of intracavity S.R. FEL radiation. We use a semi-analytical model which provides the build up of the signal combined with the storage ring damping mechanism and derive simple relations...

Low energy X-rays can be produced by Compton back-scattering a laser beam off a beam of relativistic electrons. It appears feasible by this method to provide fluences sufficient for the study of the effects of X-rays on small material samples. The underly...

This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). The project objective is to generate a large flux of tunable, monochromatic x-rays for use in mammography and coronary angiography. The approach is based on Compton backscattering of an ultraviolet solid-state ...

of the Compton backward scattering to generate high energy photon beams for nuclear physics experiments. 2 at SPring-8. When we have 107 Compton scattering per second, the loss rate of the stored electron beam Photons at SPring-8 145 Fig. 2. Relation between Compton backscattered photons and its scattering angle

The purpose of this study was to examine the potential of using backscatter information to assess regional body composition at selected sites. Two measurement techniques are examined: the measurement of the ratio of coherent to Compton scatter, and the measurement of the Compton scatter profile. Two possible applications are ...

Soon the Vanderbilt University free electron laser will be used to produce near- monochromatic x-ray beams using the phenomenon of Compton backscattering. This tunable beam has an attractive geometry and flux suitable for use in both diagnostic medical im...

The paper contains a study of intrabeam scattering in a low energy electron storage ring to be used as part of a Compton back-scattering x-ray source. We discuss time evolution of emittance and dependence of IBS growth rates on lattice parameters.

This report presents a comparison between the brightness of different sources of soft x-rays, calculating peak and average values. Synchrotron radiation or laser plasma sources as well as less conventional sources is analyzed, exploiting Compton backscatt...

We investigate the possibility to search for supersymmetry in the scattering of protons and Compton back-scattered laser light. We evaluate the cross sections for inelastic and elastic production of wino pairs for different electron-proton c.m.s. energies...

A proposal is presented in this paper to modify the extraction line polarimeter chicane to allow the Compton backscattered electrons to be deflected further from the beam line, and to provide optics for the downstream GAMCAL detector.

Physical principles of operation of the high energy photon linear colliders (PLC) based on the Compton backscattering of laser photons on high energy electrons are discussed. The main emphasis is put on the analysis of a possibility to construct the PLC w...

A possibility to construct high-intensity tunable monochromatic (gamma)-source at HERA and LEP (LEP-2) is discussed. It is proposed to produce (gamma)-quanta by means of Compton backscattering of laser photons on electrons of the collider. The laser light...

The basic idea for producing a photon-photon collider through Compton backscattering was proposed more than 20 years ago, and implementations for both warm and superconducting accelerators have been under development. Several years ago the idea to revive ...

The idea of producing beams of high energy photons by compton backscattering of laser photons was proposed over 20 years ago. At the time, producing the required laser pulses was not feasible. However, recent advances in high average power, diode pumped l...

Lateral migration radiography (LMR), a new form of Compton backscatter x-ray imaging, is applied to the detection and identification of buried land mines. Uncollimated detectors provide images that are due primarily to single-scatter photons from the soil...

Lateral migration radiography (LMR), a new form of Compton backscatter x-ray imaging, is applied to the detection and identification of buried land mines. Uncollimated detectors provide images that are due primarily to single-scatter photons from the soil...

The LEGS facility provides intense, polarized, monochromatic (gamma)-ray beams by Compton backscattering laser light from relativistic electrons circulating in the X-Ray storage ring of the National Synchrotron Light Source at Brookhaven national Laborato...

The LEGS facility provides intense, polarized, monochromatic (gamma)-ray beams by Compton backscattering laser light from relativistic electrons circulating in the X-Ray storage ring of the National Synchrotron Light Source (NSLS) at Brookhaven National L...

Motivated by the desire to put a free electron laser (FEL) weapon on a ship, the FEL and the related process of Compton backscattering are studied. The theme of the majority of this work is the interaction of the Gaussian optical mode with a beam of relat...

Physical principles of operation of high energy photon linear colliders (PLC) based on the Compton backscattering of laser photons on high energy electrons are discussed. The main emphasis is put on the analysis of a possibility to construct the PLC with ...

Photonuclear reactions play crucial roles in various processes of nucleosynthesis occurring in the universe. A laser-Compton backscattered ?-ray beam and an active target technique will be a promising tool for precise measurements of low-energy photon-induced nuclear reactions relevant to nucleosynthesis.

The design and operational data of the Nuclear Sediment Density Meter (NSDM) was reviewed. It appears that several changes should be studied for purposes of improving the characteristics of this type of instrument. A few Monte Carlo calculations using UNC...

The concept of a high-repetition-rate, high-average power ?-source is based on Compton backscattering from the relativistic electron beam inside a picosecond CO2 laser cavity. Proof-of-principle experiments combined with comput

It is shown that coherent polarized soft x-rays can be produced by a combination of two techniques - stimulated amplification of laser light in a magnetic undulator, and Compton scattering of laser photons on an electron beam. In the combined technique, l...

Within the next year we hope to begin the construction of a facility that would provide intense beams of monochromatic and polarized photons with energies in the range of several hundreds of MeV. These gamma rays will be produced by Compton backscattering...

An analytical study of detector yield as a function of source-collimator- detector geometry was conducted. The equipment to evaluate the principle of radiation thickness gaging by use of Compton backscatter was assembled and tested. Spectral response of three collimator-detector geometries was measured for radiation from Cs/sup 137/ and Sn/sup ...

Combination of two linear accelerator projects, namely CLIC (Compact Linear Collider) and ILC (International Linear Collider) with LHC(Large Hadron Collider) offer an opportunity to build ?p collider. High energy photons are produced by the Compton backscattering of the laser photons off high energy electrons at the conversion region. Then, ...

A photoneutron detection system produced by high-energy photons has been developed. The system, installed at ETL Laser-Compton-backscattered photon facility which produces quasi-monochromatic photons with energies from 1 to 40MeV, consists of a liquid scintillation neutron detector and the signal processing system. The neutron detector consists of a cylindrical container which ...

In this paper the application of Compton backscatter imaging to the detection of buried nonmetallic land mines is examined. A combination of measurements and calculations is used to address the problem. Measurements are made using an X-ray source, positioning system, and various detectors. A Monte Carlo photon transport code is the primary method used in ...

We present new, high signal-to-noise ratio results from a Monte Carlo study of the properties of the Compton shoulder of the Fe K? emission line in the toroidal X-ray reprocessor model of Murphy & Yaqoob. The model is valid for equatorial column densities in the range 1022-1025 cm-2, which comprehensively covers the Compton-thin to ...

A compact source of monoenergetic X-rays, generated via Compton backscattering, has been developed in a collaboration between U.C Davis and SLAC. The source consists of a 5.5 cell X-band photoinjector, a l.05 m long high gradient accelerator structure and...

The circular polarization of the 501-keV gamma radiation in /sup 180/Hf was remeasured by use of a Compton backscattering polarimeter with the single pulse counting technique. The result P/sub c/ = -(1.9 plus or minus 0.6) x 10/ sup -3/ confirms the strong parity mixing which was previously reported by other groups. (orig.) (GE)

Two linear accelerator projects CLIC (Compact Linear Collider) and ILC (International Linear Collider) with LHC (Large Hadron Collider) project offer a big opportunity to build ?p collider. In the ?p collider, high energy ? photons are produced by the Compton backscattering of the laser photons off high energy electrons at the conversion region. ...

An ability to determine the atomic number of a material in a cargo container would be helpful in interdicting smuggled nuclear materials. This paper examines two processes by which high energy photons interact with matter; Compton scattering and pair production. The ratio of the number of photons which originate from the annihilation of positrons resulting from pair production ...

Elastically scattered photons from 208Pb(?pol, ?) have been measured with completely polarized photons. The polarized photons (laser Compton photons) can be generated by Compton backscattering of laser light. The energy of the polarized LCPs ranges from 1 to 10 MeV by using a Q-switched Nd:YAG laser and the storage ring TERAS at ...

We describe a continuously operating scanning X-ray imaging system developed for landmine detection based on a backscatter X-ray principle, thus detection is done from the same side as the source. The source operates at 120 kV p and 3 mA. To study the physics of Compton X-ray backscattering, the photon transport factor, ...

A novel, non-invasive method of measuring the beam energy at the International Linear Collider is proposed. Laser light collides head-on with beam particles and either the energy of the Compton scattered electrons near the kinematic endpoint is measured or the positions of the Compton backscattered ?-rays, the edge electrons and the ...

This review discusses the principles and technological realisation of a technique, termed Compton scatter imaging (CSI), which is based on spatially resolved detection of Compton scattered X-rays. The applicational focus of this review is to objects of historical interest. Following a historical survey of CSI, a description is given of the major ...

The low detection efficiency of the Compton spectrometer is disadvantageous in nuclear decay scheme work with low-level or short-life activities. Omitting the gamma-collimator and placing the source bstween the two crystals improves the efficiency. To reduce the number of gamma coincidences caused by priunary quanta in the two crystals, relative to the ...

Quasi-monochromatic X-rays can be generated via Compton backscattering at the KAERI superconducting (SC) radio-frequency (RF) Linac system. The KAERI SC RF Linac with one 352 MHz cryomodule is now operating at 10 MeV. For a few keV Compton X-rays, an electron beamline is designed at the straight section, just after the SC linac, while ...

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 ...

Compton profiles for the elements C, N and O, which are important both in medical science and security screening, are represented here as weighted sums of three Gaussians. Simple scaling relationships describe the dependence on atomic number (Z) of the amplitudes and standard deviations of the component Gaussians, which are identified with the Compton ...

Based on the facility of the Shanghai Laser Electron Gamma Source (SLEGS), the transmutation for nuclear wastes such as 137Cs and 129I is investigated. It is found that nuclear waste can be transmuted efficiently via photonuclear reaction triggered by gamma photons generated from Compton backscattering between CO2 laser photons and 3.5 GeV electrons. The ...

The formation of polariton wave-packets created by high-intensity laser beams focused in plasmas is analyzed, and the velocity, energy, size, structure, stability, and electron content of such polaritonic pulses are characterized. It is shown that polaritonic pulses may transport trapped electrons with appreciable energies, provided the medium behaves as a rarefied classical plasma. The ...

A compact gamma-ray source using laser-accelerated electron beam is being under development at KAERI for nuclear applications, such as, radiography, nuclear activation, photonuclear reaction, and so on. One of two different schemes, Bremsstrahlung radiation and Compton backscattering, may be selected depending on the required specification of photons ...

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 duration of 10 ns ...

A high-intensity, inexpensive and collimated x-ray source for applications such as x-ray lithography is disclosed. An intense pulse from a high power laser, stored in a high-finesse resonator, repetitively collides nearly head-on with and Compton backscatters off a bunched electron beam, having relatively low energy and circulating in a compact storage ...

A high-intensity, inexpensive and collimated x-ray source for applications such as x-ray lithography is disclosed. An intense pulse from a high power laser, stored in a high-finesse resonator, repetitively collides nearly head-on with and Compton backscatters off a bunched electron beam, having relatively low energy and circulating in a compact storage ...

A high-intensity, inexpensive and collimated x-ray source is disclosed for applications such as x-ray lithography is disclosed. An intense pulse from a high power laser, stored in a high-finesse resonator, repetitively collides nearly head-on with and Compton backscatters off a bunched electron beam, having relatively low energy and circulating in a ...

A high-intensity, inexpensive and collimated x-ray source for applications such as x-ray lithography is disclosed. An intense pulse from a high power laser, stored in a high-finesse resonator, repetitively collides nearly head-on with and Compton backscatters off a bunched electron beam, having relatively low energy and circulating in a compact storage ...

The experimental feasibility of using an intensive photon beam at the SPring-8 for producing a high-energy g-ray beam is examined. Compton back-scattering of the soft X-photons emitted by an undulator and reflected back by a multi-layer mirror from the electron beam can produce a quasi-monochromatic g-ray beam up to an energy very close to 8GeV. The ...

An X-ray scattering method is presented for determining the thickness of an organic film placed on a steel substrate. The strong peaks of characteristic X-rays are taken as an advantage to measure the intensity of backscattered photons. It is shown that the intensity of Compton scattering of characteristic X-rays is proportional to film thickness, up to ...

An international co-operative project to develop an advanced X-ray source on the basis of Compton back-scattering is in progress. The goal is the re-configuration of the Kharkov Institute of Physics and Technology (KIPT) N-100M storage ring to support the efficient interaction of its electron beam with a high power pulsed-laser cavity. At equilibrium both ...

A field instrument is being developed for the non-invasive determination of absolute lung density using unique Compton backscattering techniques. A system consisting of a monoenergetic gamma-ray beam and a shielded high resolution high-purity-germanium (HPGe) detector in a close-coupled geometry is designed to minimize errors due to multiple scattering and ...

As distinct from the classical Compton scattering of photons off cold, non-relativistic electron gas, the differential Klein-Nishina cross-section of the Compton effect for electrons with relativistic bulk motion reaches its maximum value at the scattering angle theta = 180(deg) , i.e. in the opposite direction relative to that of incident photons. We ...

Systems based on the detection of Compton backscattered X rays have been deployed for screening personnel for weapons and explosives. Similar principles are used for screening vehicles at border-crossing points. Based on well-established scattering cross sections and absorption coefficients in conjunction with reasonable estimates of the image contrast and ...

A spectrometer has been designed to momentum analyze electrons, from the 2.5 to 3.0 GeV x-ray storage ring of the National Synchrotron Light Source at Brookhaven National Laboratory, that have lost energy from the production of high energy ..gamma..-rays by Compton scattering of laser light. The electrons detected in the focal plane will provide a tag for the ...

The Compton backscatter imaging (CBI) technique has been found to be capable of detecting buried landmines to depths of 3 to 4 in. The experimentally generated images are often cluttered by soil surface features, buried debris or soil inhomogeneities, and noise. These images can be enhanced by applying conventional low-pass and/or Wiener filters. However, ...

Photoneutron cross sections were measured for {sup 9}Be in the energy range from 1.77 to 3.75 MeV using quasi-monochromatic {gamma}-rays produced in laser-induced Compton backscattering. These cross sections are relevant to the reaction rate of the first step of the {alpha}-process of Type II and Type Ib supernovae, i.e. {alpha}({alpha}n,{gamma}){sup 9}Be. ...

Usually, photons are described by plane waves with a definite 4-momentum. In addition to plane-wave photons, "twisted photons" have recently entered the field of modern laser optics; these are coherent superpositions of plane waves with a defined projection hm of the orbital angular momentum onto the propagation axis, where m is an integer. In this Letter, we show that it is possible to produce ...

Usually, photons are described by plane waves with a definite 4-momentum. In addition to plane-wave photons, �twisted photons� have recently entered the field of modern laser optics; these are coherent superpositions of plane waves with a defined projection ?m of the orbital angular momentum onto the propagation axis, where m is an integer. In this Letter, we show that it is possible to ...

Image restoration techniques are studied for Compton backscatter imaging as applied to identification of a land mine buried in soil. Mathematical methods are developed to restore images, which include artifacts due to photon noise, soil surface irregularity, and vertical motion of the imaging system. The image restoration is formulated as an inverse photon ...

A new technique for detecting and measuring second-layer corrosion and metal loss in aircraft using Compton backscattered X-rays is presented. This technique gives a cross-sectional (through the thickness) view of aircraft sheet metal lay-ups and joints. It allows micrometer-accuracy dimensional measurements to be made as well as material identification of ...

Part of the future polarization program performed at the Bonn accelerator facility ELSA will rely on precision Compton polarimetry of the stored transversely polarized electron beam. Precise and fast polarimetry poses high demands on the light source and the detector which were studied in detail performing numerical simulations of the Compton scattering ...

Hard X-rays incident upon the photosphere with energies > or approx. =15 keV have high probabilities of backscatter due to Compton collisions with electrons. This effect has a strong influence on the spectrum, intensity, and polarization of solar hard X-rays - especially for anisotropic models in which the primary X-rays are emitted predominantly toward ...

The High Intensity Gamma Source (HIGS) at Duke University will deliver intense mono-energetic photon beams with high degrees of linear or circular polarization by backscattering of free-electron laser (FEL) photons. To exploit the unique capabilities of this facility, a program of Compton scattering studies on light nuclei (p, d, ^3He) is planned. ...

The Qweak experiment will use a new Compton polarimeter for the non-invasive, continuous measurement of the electron beam polarization. The Compton polarimeter will use four planes of multi-strip diamond detectors to detect the Compton scattered electrons and a CsI crystal to detect the back-scattered photons. The ...

Suppression systems reduce Compton backscattering counts in a gamma ray spectrum. Every system has particular calibration nuances due to differences in electronics, detectors and environment. This study examines several Compton suppression systems at the NIST Center for Neutron Research in an effort to produce a general guide to their ...

Compton backscatter imaging (CBI) is a single-sided imaging technique that uses the penetrating power of radiation and unique interaction properties of radiation with matter to image subsurface features. CBI has a variety of applications that include non-destructive interrogation, medical imaging, security and military applications. Radiography by ...

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 photon collider will require the development of high average-power short-pulse lasers to achieve the required rate of Compton backscattering. The MERCURY laser at LLNL has been under development as part of the Inertial Confinement Fusion program. Its basic parameters are well matched to the photon collider requirements and it is currently being ...

The present status of the NIJI-IV storage ring free-electron laser (SRFEL) in the visible and ultraviolet region, the design and preliminary experimental results of the generation of quasi-monochromatic X-ray beam by exploiting the laser Compton backscattering using an infrared FEL, and possible application of those beams are presented.

We study the associated production of [ital Z] and standard model Higgs bosons in high energy [gamma][gamma] collisions with the photons originating from Compton laser backscattering. According to our results, within the framework of the standard model, this process will give rise only to very few events for a yearly integrated luminosity of 10 fb[sup ...

On the basis of the intensity distribution of Compton's scattered radiation, the possibilities of danger offered by scattered rays of various radiation qualities are indicated. As an example, the distribution of dose on the diagnostic apparatus is presented, and measures for the reduction of the load are discussed. The dependence of the scatter and ...

A tagged and polarized Compton backscattered photon beam is produced at the GRAAL facility in the energy range from 0.5 GeV up to 1.5 GeV. We present new very preliminary results on beam polarization asymmetry ? for the ? photoproduction on the proton. These results confirm the relevance of resonance contributions to polarization observables.

electron beams co- propagating with a laser pulse [18]. A Compton back-scattering scheme has been recently% of Ex at wo = 1 m, respectively. In e z x (a) Counter-propagation Laser beam waist Laser pulse zo/c=10 of high-order fields of a tightly focused laser beam on the generation of relativistic nonlinear Thomson

Design features are presented of the two high current electron storage rings comprising the National Synchrotron Light Source and its basic parameters are enumerated. In addition, an overview is presented of the special radiation sources under construction and development, including a superconducting wiggler, permanent magnet wiggler, x-ray and vuv undulators, free electron laser source and ...

The authors propose a laser-electron storage ring as a high-intensity x-ray source. In this compact device, an intense pulse from a high power laser, stored in a highly reflective optical resonator, repetitively Compton backscatters off a bunched electron...

When completed, the Laser Electron Gamma Source (LEGS) is expected to provide intense beams of monochromatic and polarized (circular or linear) gamma rays with energies up to 500 MeV. The gamma-ray beams will be produced by Compton backscattering uv laser...

Collisions of light photons with relativistic electrons have previously been used to produce polarized gamma -ray beams with modest (-10%) resolution but relatively low intensity. In contrast, the LEGS project (Laser + Electron Gamma Source) at Brookhaven...

The idea to convert an electron collider into a high energy photon collider has existed for several decades. A key technological limitation to realizing this idea is the need to create a large amount of laser power to drive the Compton back-scattering. A concept to reduce the required laser power using a recirculating cavity has been proposed. We describe ...

A low-energy {gamma}{gamma} collider has been discussed in the context of a testbed for a {gamma}{gamma} interaction region at the Next Linear Collider(NLC). We consider the production of heavy mesons at such a testbed using Compton-backscattered photons and demonstrate that their production rivals or exceeds those by BELLE, BABAR or LEP where they are produced indirectly via ...

Photofission cross sections of (sup 209) Bi, (sup nat) Pb, (sup 197) Au, (sup nat) Pt, (sup nat) W, (sup 181) Ta, (sup 51) V, and (sup nat) Ti nuclei have been measured at an incident photon energy of 100 MeV using monochromatic photons produced by Compto...

High power microwave sources at X-Band, delivering 400 to 500 of megawatts for about 400 ns, have been recently developed. These sources can power a microwave undulator with short period and large gap, and can be used in short wavelength FELs reaching the...

A passive optical resonator stores optical pulses within a cavity to increase the optical power level of input pulses via resonant reflections without the use of an internal optical gain medium. In one embodiment for a Compton backscattering system, the o...

The study of ({gamma},n) reactions can be used to constrain the theoretical predictions of the neutron capture cross sections of short-lived branching points in the s process. The usability of the activation technique to study these ({gamma},n) reactions is discussed as one example of an activation experiment in nuclear astrophysics. Two photon sources using bremsstrahlung and ...

The study of (?,n) reactions can be used to constrain the theoretical predictions of the neutron capture cross sections of short-lived branching points in the s process. The usability of the activation technique to study these (?,n) reactions is discussed as one example of an activation experiment in nuclear astrophysics. Two photon sources using bremsstrahlung and ...

Recent advances in novel technologies such as chirped pulse amplification and high gradient rf photoinjectors make it possible to study experimentally the interaction of relativistic electrons with ultrahigh intensity photon fields. Femtosecond laser systems operating in the TW{endash}PW range are now available, as well as synchronized relativistic electron bunches with subpicosecond durations and ...

Recent advances in novel technologies (including chirped-pulse amplification, femtosecond laser systems operating in the TW-PW range, high-gradient rf photoinjectors, and synchronized relativistic electron bunches with subpicosecond durations and THz bandwidths) allow experimentalists to study the interaction of relativistic electrons with ultrahigh-intensity photon fields. Ponderomotive ...

The double-differential cross section d2?/d? dE for Compton backscattering in germanium was measured at the photon energy of 86.5 keV. The experimental setup with two high-purity germanium detectors operating in the coincidence mode was applied. A multiline radioactive source of 15563Eu was used as the source of photons. The Compton ...

We have produced a beam of high-energy gamma-rays by Compton backscattering of 1064nm laser photons from 1 GeV electrons circulating in a storage ring. Measuring the energy spectra of the backscattering photons with an HPGe detector, we have found that the maximum energy of 17.6MeV and the measured energy spectra show agreement with ...

It is shown that coherent polarized soft x-rays can be produced by a combination of two techniques - stimulated amplification of laser light in a magnetic undulator, and Compton scattering of laser photons on an electron beam. In the combined technique, laser radiation is Compton scattered from a relativistic electron beam, whose current or charge density ...

A concept of high intensity femtosecond laser synchrotron source (LSS) is based on Compton backscattering of focused electron and laser beams. The short Rayleigh length of the focused laser beam limits the length of interaction to a few picoseconds. However, the technology of the high repetition rate high-average power picosecond lasers required for high ...

A concept of high intensity femtosecond laser synchrotron source (LSS) is based on Compton backscattering of focused electron and laser beams. The short Rayleigh length of the focused laser beam limits the length of interaction to a few picoseconds. However, the technology of the high repetition rate high-average power picosecond lasers required for high ...

The Qweak experiment will use a new Compton polarimeter for the non-invasive continuous measurement of the electron beam polarization. The Compton polarimeter will use four planes of multi-strip diamond detectors to detect the Compton scattered electrons and a CsI crystal to detect the back-scattered photons. The ...

This report discusses the theory and application of x-ray and gamma-ray backscatter to the problem of nonmetallic landmine detection. The fundamental interactions of X and gamma radiation with matter, including photoelectric absorption, Compton scattering, and pair production, are reviewed. The backscatter spectrum is analyzed in terms ...

The emission of a pair of entangled photons by an electron in an intense laser field can be described by two-photon transitions of laser-dressed, relativistic Dirac-Volkov states. In the limit of a small laser field intensity, the two-photon transition amplitude approaches the result predicted by double Compton scattering theory. Multiexchange processes with the laser field, ...

We propose a novel high peak power ultrashort laser pulse re-circulation technique suitable for gamma-ray generation in Compton-backscattering sources. The two primary obstacles to higher average brightness and conversion efficiency of laser pulse energy to gamma-rays are the relatively small Compton scattering cross-section and the typically low ...

The current research project at Bates is with the BLAST (Bates Large Acceptance Spectrometer Toroid) detector, designed to study the structure of the nucleon using hydrogen and deuterium targets. A Compton polarimeter measures the polarization of an 850 MeV electron beam; the polarization is essential information for the analysis of the BLAST data. The polarimeter measures the ...

The circular polarization-circular polarization angular correlation of annihilation quanta has been measured unambiguously by use of two backscattering Compton polarimeters in coincidence. The interpretation of the measurement required a quantum mechanical calculation of the circular polarization detection probability for coincident annihilation ...

The effects of scattering angle, source angle, source position, detector position, and gamma-ray energy on the intensity of backscatter radiation from Al, asbestos, glass, steel, plywood and G. I. sheets of various thicknesses were studied using the 662-kev gamma ray of Cs/sup 137/ as the radiation source. Intensity showed a minimum between 80 and 90 deg scattering ...

Completely polarized gamma-rays can be generated by Compton backscattering of laser light. The energy of the polarized gamma-rays ranges from 1 to 10 MeV by using a Nd:YAG laser and the storage ring TERAS at Electrotechnical Laboratory. The energy spread of the gamma-rays varies from 1 to 4% according to its energy. The gamma-ray yield is measured to be ...

The authors present calculations describing the production of photons through multi-step processes occurring when a beam of gamma rays interacts with a macroscopic material. These processes involve the creation of energetic electrons through Compton scattering, photo-absorption and pair production, the subsequent scattering of these electrons, and the creation of energetic ...

Generation of quasi-monochromatic photon beams of energy variable between 1.7 - 6.5 MeV has been observed by inducing the Compton backscattering of laser light quanta on electrons of energy 305 - 606 MeV at the injection straight section of the 600-MeV ETL storage ring. A Nd-YAG laser of wavelength 1.0641..mu.. has been used with output power 0.7 - 1.2 W. ...

The chief source of high-energy electrons from a fission spectrum is the Compton effect. The density of Compton recoil electrons from a plate of thickness large compared to electron range but small compared to gamma range increases slowly with atomic number. Expressions based on the Kukla gamma spectrum are derived for net current flow to or from ...

A CsI(Tl) yield monitor has been constructed for the detection of quasi-monochromatic photons generated by Compton backscattering of laser light at the Electrotechnical laboratory (ETL). The monitor has dimensions of 150 x 150 x 300 mm[sup 3], consisting of 9-CsI(Tl) crystals. The fundamental performances of the CsI(Tl) monitor were measured with Radio ...

The medical isotope Molybdenum-99 is presently used for 80-85% of all nuclear medicine procedures and is produced by irradiating highly enriched uranium U-235 targets in NRU reactors. It was recently proposed that an electron linac be used for the production of 99Mo via photo-fission of a natural uranium target coming from the excitation of the giant dipole resonance around 15 MeV. The photons can ...

More than sixty gamma-ray emitting blazars have been detected by the Compton Gamma Ray Observatory (CGRO). A sub-class of these blazars is known as MeV blazars that are most luminous at the MeV energies. Spectra of these sources show a break somewhere between 1 MeV and 30 MeV with break amplitude as large as Delta(Gamma) = 1.5. Different models like ...

The design of a fast Compton-scattering laser polarimeter for LEP is outlined. Although the design is optimized for LEP at 50 GeV/beam, general considerations are extended to LEP energies up to 100 GeV/beam. Besides a recall of the physics of the polarimeter the study includes considerations on the background and consequent design of the layout, the optimization of the ...

The design of a fast Compton-scattering laser polarimeter for LEP is outlined. Although the design is optimized for LEP at 50 GeV/beam, general considerations are extended to LEP energies up to 100 GeV/beam. Besides a recall of the physics of the polarimeter the study includes considerations on the background and consequent design of the layout, the optimization of the ...

The ALICE accelerator (Accelerators and Lasers In Combined Experiments) at Daresbury Laboratory is a 35 MeV ERL. The electron beam drives an infra-red free-electron laser (FEL) and THz light sources, but can also be used to generate X-rays through Compton back-scattering (CBS). ALICE also acts as the injector for the EMMA NS-FFAG machine. This paper will ...

The radiative and quantum effects in laser plasmas are discussed. The self-consistent numerical model based on particle-in-cell and Monte-Carlo methods are developed. First we analyze the spectra of Compton backscattered photons and betatron radiation in the classical and quantum regimes. Then we address an interaction between intense laser pulse and ...

Cross section measurements for photofission induced in (sup 209) Bi, (sup natP)b, (sup 197) Au, (sup nat) Pt, nat(sub w), (sup 181) Ta, (sup 51) V and (sup nat) Ti by 120- and 145-MeV quasi-monochromatic photon beams have been performed at the ROKK-1M fac...

The photodisintegration of 4He at the ?-ray energy of about 25MeV provides a useful tool to investigate the problems of the electromagnetic transition strength in the reaction and the charge symmetry in nuclear force. In this study we made a new exclusive measurement of the photodisintegration of 4He using a laser-Compton-backscattered ? beam and a time projection chamber with ...

Photoneutron cross sections for Ta181(?,n)Tam180 were determined from simultaneous measurements of total cross sections (?tot) and ground-state cross sections (?gs) for Ta180 in photodisintegration of Ta181 with laser Compton-backscattered ? rays. Techniques of direct neutron counting and photoactivation were used for the measurement of ?tot and ?gs, respectively. The partial ...

The idea of producing beams of high energy photons by Compton backscattering of laser photons was proposed over 20 years ago. At the time, producing the required laser pulses was not feasible. However, recent advances in high average power, diode pumped lasers appear to have solved this problem. The US Collaboration is now turning its attention to the ...

Calculations of X-Ray production rates, energy spread, and spectrum of Compton-backscattered photons from a Free Electron Laser on an electron beam in a low energy (136-MeV) compact (8.5-m circumference) storage ring indicate that an X-Ray intensity of 34.6 10{sup 7} X-Ray photons per 0.5-mm {times} 0.5-mm pixel for Coronary Angiography near the 33.169-keV iodine K-absorption ...

Calculations of X-Ray production rates, energy spread, and spectrum of Compton-backscattered photons from a Free Electron Laser on an electron beam in a low energy (136-MeV) compact (8.5-m circumference) storage ring indicate that an X-Ray intensity of 34.6 10(exp 7) X-Ray photons per 0.5-mm times 0.5-mm pixel for Coronary Angiography near the 33.169-keV iodine K-absorption ...

At the laser electron photon facility at SPring-8 (LEPS), meson photoproduction reactions have been studied by using highly polarized photon beams produced by the Compton backscattering of the laser off the high energy electrons. The recent activities at the LEPS experiment are overviewed. From the recent results, the meson photo-production reactions at ...

We discuss the production of coherent electromagnetic radiation from an electron beam in a storage ring and some of the possible applications of this radiation. Coherent radiation production can be obtained with a free electron laser and this gives a number of photons per unit time and wavelength six or more order of magnitude larger than that obtained from incoherent synchrotron radiation. We ...

A {gamma}{gamma} collider would extend and complement the physics capability of a linear collider; e.g. it would be suitable for direct measurement of the partial decay width of a Higgs boson into two gamma quanta. This paper discusses choice of laser parameters, luminosity optimization, electron and laser parameters for a gamma- gamma collider as a second interaction region for the Next Linear ...

A time projection chamber has been newly constructed for studying the nuclear photodisintegration reaction of a gas sample. All charged fragments from various channels of the reaction can be detected simultaneously by means of the time projection chamber with about 100% efficiency in the geometry of 4?. The assignment of these fragments to an individual reaction channel is unambiguously made using ...

High power microwave sources at X-Band, delivering 400 to 500 of megawatts for about 400 ns, have been recently developed. These sources can power a microwave undulator with short period and large gap, and can be used in short wavelength FELs reaching the nm region at a beam energy of about 1 GeV. We present here an experiment designed to demonstrate that microwave undulators have the field ...

The Qweak experiment currently running in Hall C of Jefferson Lab will measure the electro-weak parity violating asymmetry in the cross sections of elastic electron-proton scattering at an energy of 1.16 GeV and determine the weak mixing angle 2??W at a Q^2 of 0.03 GeV^2/c^2. The largest contribution to the systematic error is the polarization measurement. To limit this uncertainty a new ...

In this study we utilize neutron Compton scattering (NCS) to determine differences in nuclear momentum distributions in NaH, both as bulk material and encapsulated as nanoscale particles (from 20 to 50 nm in diameter) within an amorphous silica-gel matrix (SiGNaH). In addition, elemental Na dispersed in such a matrix is also studied (SiGNa). Data treatment and fitting of ...

In this study we utilize neutron Compton scattering (NCS) to determine differences in nuclear momentum distributions in NaH, both as bulk material and encapsulated as nanoscale particles (from 20 to 50 nm in diameter) within an amorphous silica-gel matrix (SiGNaH). In addition, elemental Na dispersed in such a matrix is also studied (SiGNa). Data treatment and fitting of ...

Laser Compton scattering by relativistic electrons provides the energy information associated with electron beams in an accelerator. Determining the electron beam energy by this method depends primarily on the signal to noise (S/N) ratio associated with laser Compton scattering. In this study, we propose a method to enhance the S/N ratio by synchronous ...

A Monte Carlo calculation for the initial electron energy spectra produced in semi-infinite and finite water phantoms irradiated by photons of energies up to 2 MeV and photons from 60Co are presented incorporating successive Compton scattering, photoelectric absorption and Auger effect. The backscattering of photons through the top of the phantom and ...