Author: Theofilos Kotseroglou
Publisher:
ISBN:
Category :
Languages : en
Pages : 518

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Author: T. Kotseroglou
Publisher:
ISBN:
Category :
Languages : en
Pages : 127

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Book Description
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:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
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:
Publisher:
ISBN:
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: Frank Wissmann
Publisher: Springer Science & Business Media
ISBN: 9783540407423
Category : Science
Languages : en
Pages : 170

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Book Description
A comprehensive summary of experiments on Compton scattering from the proton and neutron performed at the electron accelerator MAMI. The experiments cover a photon energy range from 30 MeV to 500 MeV. The reader is introduced to the theoretical concepts of Compton scattering, followed by a description of the experiments on the proton, their analysis and results.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: Christopher Ivan Moore
Publisher:
ISBN:
Category :
Languages : en
Pages : 318

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Author: Frank Wissmann
Publisher: Springer
ISBN: 9783662145708
Category :
Languages : en
Pages : 168

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Book Description
A comprehensive summary of experiments on Compton scattering from the proton and neutron performed at the electron accelerator MAMI. The experiments cover a photon energy range from 30 MeV to 500 MeV. The reader is introduced to the theoretical concepts of Compton scattering, followed by a description of the experiments on the proton, their analysis and results.

Author: Arne Müller
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: H B Van Linden Van Den Heuvell
Publisher: World Scientific
ISBN: 9814545929
Category :
Languages : en
Pages : 474

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Book Description
Atomic Physics 15 extends the series of books containing the invited papers presented at each International Conference on Atomic Physics (ICAP). The ICAP, held every two years, provides the atomic physics community with an opportunity to review problems of current interest and to consider future directions in the field. This fifteenth meeting also celebrated the centenary of the discovery of the Zeeman effect.