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Category :
Languages : en
Pages : 11
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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: Robert Zev Olshan
Publisher:
ISBN:
Category : Free electron lasers
Languages : en
Pages : 326
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Author:
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Category :
Languages : en
Pages : 7
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In a new experiment at the Final Focus Test Beam at SLAC a low- emittance 46.6 GeV electron beam is brought into collision with terawatt pulses from a 1.06 [mu] wavelength Nd:glass laser. Peak laser intensities of 1018 W/cm2 have been achieved corresponding to a value of 0.6 for the parameter [eta] = {ital eE/mw{sub 0}c}, and to a value of 0.3 for the parameter [Upsilon] = {ital E{sup *}/E{sub crit}} = 2[gamma]{ital ehE}/{ital m}2{ital c}3 in the case of frequency doubled laser pulses. In these circumstances an electron that crosses the center of the laser pulse has near unit interaction probability. Signals are presented for multiphoton Compton scattering in which up to 4 laser photons interact with an electron. High energy backscattered photons of GeV energy can interact within the laser focus to create electron- positron pairs; an excess of 15 positrons above a background of 14 was observed in a run of 6,000 laser shots.
Author: Stanford University. Microwave Laboratory
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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Author:
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ISBN:
Category :
Languages : en
Pages :
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Author: Roland Rufus Roskos
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Category : Electrons
Languages : en
Pages : 208
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Author: Gary A. Smith
Publisher: American Inst. of Physics
ISBN: 9780735401037
Category : Science
Languages : en
Pages : 574
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The proceedings of the 10th Beam Instrumentation Workshop contains papers discussing the design principles and engineering issues of beam diagnostic and control instrumentation for charged particle accelerators and beam transport lines. The papers, presented at the 2002 Workshop, consist of tutorials, invited talks, and contributed oral and poster presentations.
Author: T. Kotseroglou
Publisher:
ISBN:
Category :
Languages : en
Pages : 127
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This experiment tests Quantum Electrodynamics in the strong field regime. Nonlinear Compton scattering has been observed during the interaction of a 46.6 GeV electron beam with a 10{sup 18} W/cm{sup 2} laser beam. The strength of the field achieved was measured by the parameter {eta} = e{var_epsilon}{sub rms}/{omega}mc = 0.6. Data were collected with infrared and green laser photons and circularly polarized laser light. The timing stabilization achieved between the picosecond laser and electron pulses has {sigma}{sub rms} = 2 ps. A strong signal of electrons that absorbed up to 4 infrared photons (or up to 3 green photons) at the same point in space and time, while emitting a single gamma ray, was observed. The energy spectra of the scattered electrons and the nonlinear dependence of the electron yield on the field strength agreed with the simulation over 3 orders of magnitude. The detector could not resolve the nonlinear Compton scattering from the multiple single Compton scattering which produced rates of scattered electrons of the same order of magnitude. Nevertheless, a simulation has studied this difference and concluded that the scattered electron rates observed could not be accounted for only by multiple ordinary Compton scattering; nonlinear Compton scattering processes are dominant for n {ge} 3.
Author: Robert Zev Olshan
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ISBN:
Category : Lasers
Languages : en
Pages : 0
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Author:
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Category :
Languages : en
Pages :
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New configurations of lasers and electron beams efficiently and robustly produce high flux beams of bright, tunable, polarized quasi-monoenergetic x-rays and gamma-rays via laser-Compton scattering. Specifically, the use of long-duration, pulsed lasers and closely-spaced, low-charge and low emittance bunches of electron beams increase the spectral flux of the Compton-scattered x-rays and gamma rays, increase efficiency of the laser-electron interaction and significantly reduce the overall complexity of Compton based light sources.
