Electron Beam Diagnostics of a 25 MeV Electron Beam from a Linear Accelerator Using Laser Compton Scattering PDF Download
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Author: Yoshimasa Toyoda
Publisher:
ISBN:
Category : Compton effect
Languages : en
Pages : 172
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Book Description
Laser Compton scattering (LCS) between a Nd:YAG laser and a 25 MeV electron beam from a linear accelerator at the Idaho Accelerator Center yielded an intense monochromatic x-ray beam. Spectra from the LCS were used to demonstrate the possibility of the LCS as a sensitive and non-destructive electron beam diagnostic tool. The spectral simulations were conducted using the Lorentz boosted Klein-Nishina formula. In addition, effects of an electron energy spread and angular divergence in a spectral peak LCS x-ray energy and full width half maximum (FWHM) were studied from convolutions of the Klein-Nishina formula. The electron energy, energy spread, angular divergence, and beam direction with respect to the beam transport line axis of a 25 MeV electron beam were determined from a series of LCS x-ray spectra obtained at various detector observation angles. All spectra were fitted simultaneously using the global fit method to obtain a set of electron beam parameters that provided the minimum value of a determinant of chi-square matrix.
Author: Yoshimasa Toyoda
Publisher:
ISBN:
Category : Compton effect
Languages : en
Pages : 172
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Book Description
Laser Compton scattering (LCS) between a Nd:YAG laser and a 25 MeV electron beam from a linear accelerator at the Idaho Accelerator Center yielded an intense monochromatic x-ray beam. Spectra from the LCS were used to demonstrate the possibility of the LCS as a sensitive and non-destructive electron beam diagnostic tool. The spectral simulations were conducted using the Lorentz boosted Klein-Nishina formula. In addition, effects of an electron energy spread and angular divergence in a spectral peak LCS x-ray energy and full width half maximum (FWHM) were studied from convolutions of the Klein-Nishina formula. The electron energy, energy spread, angular divergence, and beam direction with respect to the beam transport line axis of a 25 MeV electron beam were determined from a series of LCS x-ray spectra obtained at various detector observation angles. All spectra were fitted simultaneously using the global fit method to obtain a set of electron beam parameters that provided the minimum value of a determinant of chi-square matrix.
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Category :
Languages : en
Pages : 11
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Book Description
LCS experiments were carried out at the Idaho Accelerator Center (IAC); sharp monochromatic x-ray lines were observed. These are produced using the so-called inverse Compton effect, whereby optical laser photons are collided with a relativistic electron beam. The back-scattered photons are then kinematically boosted to keV x-ray energies. We have first demonstrated these beams using a 20 MeV electron beam collided with a 100 MW, 7 ns Nd; YAG laser. We observed narrow LCS x-ray spectral peaks resulting from the interaction of the electron beam with the Nd; YAG laser second harmonic (532 nm). The LCS x-ray energy lines and energy deviations were measured as a function of the electron beam energy and enery-spread respectively. The results showed good agreement with the predicted valves. LCS could provide an exellent probe of electron beam energy, energy spread, transverse and longitudinal distribution and direction.
Author: Luigi Palumbo
Publisher: World Scientific
ISBN: 9814474053
Category : Technology & Engineering
Languages : en
Pages : 729
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Book Description
These proceedings comprise cutting-edge contributions by researchers at the frontiers of beam physics, free-electron-based light sources, and advanced accelerators. It represents a snap-shot of activity in these fields at a critical historical juncture, where rapid experimental progress is being reported, and new facilities such as X-ray free-electron lasers are under construction. The volume features invited contributions from leading researchers from the international beam physics community that summarize the state-of-the-art research in individual topics, as well as timely contributions from participants that arose during the workshop itself.
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Category :
Languages : en
Pages : 3
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Book Description
A comprehensive study of focusing of relativistic electron beams with overdense and underdense plasma lenses requires careful control of plasma density and scale lengths. Plasma lens experiments are planned at the Beam Test Facility of the LBL Center for Beam Physics, using the 50 MeV electron beam delivered by the linac injector from the Advanced Light Source. Here we present results from an interferometric study of plasmas produced in tri-propylamine vapor with a frequency quadrupled Nd:YAG laser at 266 nm. To study temporal dynamics of plasma lenses we have developed an electron beam diagnostic using optical transition radiation to time resolve beam size and divergence. Electron beam ionization of the plasma has also been investigated.
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Category :
Languages : en
Pages :
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Recent developments in the electron beam diagnostics used on the Los Alamos Free-Electron Laser (FEL) have extended our on-line, quantitative analysis capability to extraction efficiency and micropulse temporal duration. The FEL's 20-MeV electron beam is 100 .mu.s in length and consists of approx. 2000 micropulses of 20-ps duration and 46-ns separation. This extreme range of time scales is addressed by employing a combination of synchronized beam deflectors, an electron spectrometer, intensified video cameras, real-time video digitizers, and microcomputers. The tapered wiggler result for extraction efficiency (2%) and results for pulse duration measurements (10 to 15 ps) by two techniques are presented.
Author:
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ISBN:
Category :
Languages : en
Pages : 145
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Beam diagnostics is an essential constituent of any accelerator, so that it is named as "organs of sense" or "eyes of the accelerator." Beam diagnostics is a rich field. A great variety of physical effects or physical principles are made use of in this field. Some devices are based on electro-magnetic influence by moving charges, such as faraday cups, beam transformers, pick-ups; Some are related to Coulomb interaction of charged particles with matter, such as scintillators, viewing screens, ionization chambers; Nuclear or elementary particle physics interactions happen in some other devices, like beam loss monitors, polarimeters, luminosity monitors; Some measure photons emitted by moving charges, such as transition radiation, synchrotron radiation monitors and diffraction radiation-which is the topic of the first part of this thesis; Also, some make use of interaction of particles with photons, such as laser wire and Compton polarimeters-which is the second part of my thesis. Diagnostics let us perceive what properties a beam has and how it behaves in a machine, give us guideline for commissioning, controlling the machine and indispensable parameters vital to physics experiments. In the next two decades, the research highlight will be colliders (TESLA, CLIC, JLC) and fourth-generation light sources (TESLA FEL, LCLS, Spring 8 FEL) based on linear accelerator. These machines require a new generation of accelerator with smaller beam, better stability and greater efficiency. Compared with those existing linear accelerators, the performance of next generation linear accelerator will be doubled in all aspects, such as 10 times smaller horizontal beam size, more than 10 times smaller vertical beam size and a few or more times higher peak power. Furthermore, some special positions in the accelerator have even more stringent requirements, such as the interaction point of colliders and wigglor of free electron lasers. Higher performance of these accelerators increases the difficulty of diagnostics. For most cases, intercepting measurements are no longer acceptable, and nonintercepting method like synchrotron radiation monitor can not be applied to linear accelerators. The development of accelerator technology asks for simutanous diagnostics innovations, to expand the performance of diagnostic tools to meet the requirements of the next generation accelerators. Diffraction radiation and inverse Compton scattering are two of the most promising techniques, their nonintercepting nature avoids perturbance to the beam and damage to the instrumentation. This thesis is divided into two parts, beam size measurement by optical diffraction radiation and Laser system for Compton polarimeter. Diffraction radiation, produced by the interaction between the electric field of charged particles and the target, is related to transition radiation. Even though the theory of diffraction radiation has been discussed since 1960s, there are only a few experimental studies in recent years. The successful beam size measurement by optical diffraction radiation at CEBAF machine is a milestone: First of all, we have successfully demonstrated diffraction radiation as an effective nonintercepting diagnostics; Secondly, the simple linear relationship between the diffraction radiation image size and the actual beam size improves the reliability of ODR measurements; And, we measured the polarized components of diffraction radiation for the first time and I analyzed the contribution from edge radiation to diffraction radiation.
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Category :
Languages : en
Pages : 3
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Femtosecond x-ray pulses may be generated by 90° Compton side scattering of a short visible laser beam by a well-focused relativistic electron beam. A proof-of-principle experiment is underway using the ALS linac. From this experiment an x-ray pulse of 105 photons with a duration of 230 fs in a bandwidth of 10% at 10 Hz is expected. In this paper we explore using the ALS booster instead to increase the average x-ray flux. To generate the small beam size we plan to radiation damp electrons by accelerating them to 600 MeV and decelerate quickly to 50 MeV before intra-beam scattering can increase the beam size. We can achieve a vertical emittance of
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Category :
Languages : en
Pages :
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Electron accelerators such as laser wakefield accelerators, linear accelerators driving free electron lasers, or femto-sliced synchrotrons, are capable of producing femtosecond-long electron bunches. Single-shot characterization of the temporal charge profile is crucial for operation, optimization, and application of such accelerators. A variety of electro-optic sampling (EOS) techniques exists for the temporal analysis. In EOS, the field profile from the electron bunch (or the field profile from its coherent radiation) will be transferred onto a laser pulse co-propagating through an electro-optic crystal. This paper will address the most common EOS schemes and will list their advantages and limitations. Strong points that all techniques share are the ultra-short time resolution (tens of femtoseconds) and the single-shot capabilities. Besides introducing the theory behind EOS, data from various research groups is presented for each technique.
Author:
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ISBN:
Category : Nuclear energy
Languages : en
Pages : 1212
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Author:
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ISBN:
Category :
Languages : en
Pages :
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A comprehensive study of charge diagnostics is conducted to verify their validity for measuring electron beams produced by laser plasma accelerators (LPAs). First, a scintillating screen (Lanex) was extensively studied using subnanosecond electron beams from the Advanced Light Source booster synchrotron, at the Lawrence Berkeley National Laboratory. The Lanex was cross calibrated with an integrating current transformer (ICT) for up to the electron energy of 1.5 GeV, and the linear response of the screen was confirmed for charge density and intensity up to 160 pC/mm2 and 0.4 pC/(ps mm2), respectively. After the radio-frequency accelerator based cross calibration, a series of measurements was conducted using electron beams from an LPA. Cross calibrations were carried out using an activation-based measurement that is immune to electromagnetic pulse noise, ICT, and Lanex. The diagnostics agreed within ±8%, showing that they all can provide accurate charge measurements for LPAs.
