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Title: Three-dimensional time and frequency-domain theory of femtosecond x-ray pulse generation through Thomson Scattering

Abstract

The generation of high intensity, ultra-short x-ray pulses enables exciting new experimental capabilities, such as femtosecond pump-probe experiments used to temporally resolve material structural dynamics on atomic time scales. Thomson backscattering of a high intensity laser pulse with a bright relativistic electron bunch is a promising method for producing such high brightness x-ray pulses in the 10-100 keV range within a compact facility. While a variety of methods for producing sub-picosecond x-ray bursts by Thomson scattering exist, including compression of the electron bunch to sub-picosecond bunch lengths and/or colliding a sub-picosecond laser pulse in a side-on geometry to minimize the interaction time, a promising alternative approach to achieving this goal while maintaining ultra-high brightness is the production of a time correlated (or chirped) x-ray pulse in conjunction with pulse slicing or compression. We present the results of a complete analysis of this process using a recently developed 3-D time and frequency-domain code for analyzing the spatial, temporal, and spectral properties an x-ray beam produced by relativistic Thomson scattering. Based on the relativistic differential cross section, this code has the capability to calculate time and space dependent spectra of the x-ray photons produced from linear Thomson scattering for both bandwidth-limited andmore » chirped incident laser pulses. Spectral broadening of the scattered x-ray pulse resulting from the incident laser bandwidth, laser focus, and the transverse and longitudinal phase space of the electron beam were examined. Simulations of chirped x-ray pulse production using both a chirped electron beam and a chirped laser pulse are presented. Required electron beam and laser parameters are summarized by investigating the effects of beam emittance, energy spread, and laser bandwidth on the scattered x-ray spectrum. It is shown that sufficient temporal correlation in the scattered x-ray spectrum to produce sub-100 fs temporal slice resolution can be produced from state-of-the-art, high-brightness electron beams without the need to perform longitudinal compression on the electron bunch.« less

Authors:
;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
15013873
Report Number(s):
UCRL-JRNL-202077
Journal ID: ISSN 1098-4402; TRN: US0801337
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Journal Article
Journal Name:
Physical Review Special Topics. Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Special Topics. Accelerators and Beams; Journal ID: ISSN 1098-4402
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 70 PLASMA PHYSICS AND FUSION; 42 ENGINEERING; BEAM EMITTANCE; BRIGHTNESS; COMPRESSION; DIFFERENTIAL CROSS SECTIONS; ELECTRON BEAMS; KEV RANGE; PHASE SPACE; THOMSON SCATTERING

Citation Formats

Brown, W J, and Hartemann, F V. Three-dimensional time and frequency-domain theory of femtosecond x-ray pulse generation through Thomson Scattering. United States: N. p., 2004. Web. doi:10.1103/PhysRevSTAB.7.060703.
Brown, W J, & Hartemann, F V. Three-dimensional time and frequency-domain theory of femtosecond x-ray pulse generation through Thomson Scattering. United States. doi:10.1103/PhysRevSTAB.7.060703.
Brown, W J, and Hartemann, F V. Tue . "Three-dimensional time and frequency-domain theory of femtosecond x-ray pulse generation through Thomson Scattering". United States. doi:10.1103/PhysRevSTAB.7.060703. https://www.osti.gov/servlets/purl/15013873.
@article{osti_15013873,
title = {Three-dimensional time and frequency-domain theory of femtosecond x-ray pulse generation through Thomson Scattering},
author = {Brown, W J and Hartemann, F V},
abstractNote = {The generation of high intensity, ultra-short x-ray pulses enables exciting new experimental capabilities, such as femtosecond pump-probe experiments used to temporally resolve material structural dynamics on atomic time scales. Thomson backscattering of a high intensity laser pulse with a bright relativistic electron bunch is a promising method for producing such high brightness x-ray pulses in the 10-100 keV range within a compact facility. While a variety of methods for producing sub-picosecond x-ray bursts by Thomson scattering exist, including compression of the electron bunch to sub-picosecond bunch lengths and/or colliding a sub-picosecond laser pulse in a side-on geometry to minimize the interaction time, a promising alternative approach to achieving this goal while maintaining ultra-high brightness is the production of a time correlated (or chirped) x-ray pulse in conjunction with pulse slicing or compression. We present the results of a complete analysis of this process using a recently developed 3-D time and frequency-domain code for analyzing the spatial, temporal, and spectral properties an x-ray beam produced by relativistic Thomson scattering. Based on the relativistic differential cross section, this code has the capability to calculate time and space dependent spectra of the x-ray photons produced from linear Thomson scattering for both bandwidth-limited and chirped incident laser pulses. Spectral broadening of the scattered x-ray pulse resulting from the incident laser bandwidth, laser focus, and the transverse and longitudinal phase space of the electron beam were examined. Simulations of chirped x-ray pulse production using both a chirped electron beam and a chirped laser pulse are presented. Required electron beam and laser parameters are summarized by investigating the effects of beam emittance, energy spread, and laser bandwidth on the scattered x-ray spectrum. It is shown that sufficient temporal correlation in the scattered x-ray spectrum to produce sub-100 fs temporal slice resolution can be produced from state-of-the-art, high-brightness electron beams without the need to perform longitudinal compression on the electron bunch.},
doi = {10.1103/PhysRevSTAB.7.060703},
journal = {Physical Review Special Topics. Accelerators and Beams},
issn = {1098-4402},
number = ,
volume = ,
place = {United States},
year = {2004},
month = {1}
}

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