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Title: Coherent transition radiation from a laser wakefield accelerator as an electron bunch diagnostic

Abstract

The observation and modeling of coherent transition radiation from femtosecond laser accelerated electron bunches is discussed. The coherent transition radiation, scaling quadratically with bunch charge, is generated as the electrons transit the plasma-vacuum boundary. Due to the limited transverse radius of the plasma boundary, diffraction effects will strongly modify the angular distribution and the total energy radiated is reduced compared to an infinite transverse boundary. The multi-nC electron bunches, concentrated in a length of a few plasma periods (several tens of microns), experience partial charge neutralization while propagating inside the plasma towards the boundary. This reduces the space-charge blowout of the beam, allowing for coherent radiation at relatively high frequencies (several THz). The charge distribution of the electron bunch at the plasma-vacuum boundary can be derived from Fourier analysis of the coherent part of the transition radiation spectrum. A Michelson interferometer was used to measure the coherent spectrum, and electron bunches with duration on the order of 50 fs (rms) were observed.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Director. Office of Science. Office of High Energy Physics; Hertz Foundation (US)
OSTI Identifier:
837940
Report Number(s):
LBNL-56573
R&D Project: 455401; TRN: US0501168
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Conference
Resource Relation:
Conference: The 11th Advanced Accelerator Concepts Workshop 2004, Stony Brook, NY (US), 06/21/2004--06/26/2004; Other Information: PBD: 22 Oct 2004
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; ANGULAR DISTRIBUTION; BLOWOUTS; CHARGE DISTRIBUTION; COHERENT RADIATION; DIFFRACTION; ELECTRONS; FOURIER ANALYSIS; LASERS; MICHELSON INTERFEROMETER; SIMULATION; SPACE CHARGE; TRANSITION RADIATION; WAKEFIELD ACCELERATORS; LASER WAKEFIELD ACCELERATOR

Citation Formats

van Tilborg, J., Geddes, C.G.R., Toth, C., Esarey, E., Schroeder, C.B., Martin, M.C., Hao, Z., and Leemans, W.P. Coherent transition radiation from a laser wakefield accelerator as an electron bunch diagnostic. United States: N. p., 2004. Web.
van Tilborg, J., Geddes, C.G.R., Toth, C., Esarey, E., Schroeder, C.B., Martin, M.C., Hao, Z., & Leemans, W.P. Coherent transition radiation from a laser wakefield accelerator as an electron bunch diagnostic. United States.
van Tilborg, J., Geddes, C.G.R., Toth, C., Esarey, E., Schroeder, C.B., Martin, M.C., Hao, Z., and Leemans, W.P. Fri . "Coherent transition radiation from a laser wakefield accelerator as an electron bunch diagnostic". United States. doi:. https://www.osti.gov/servlets/purl/837940.
@article{osti_837940,
title = {Coherent transition radiation from a laser wakefield accelerator as an electron bunch diagnostic},
author = {van Tilborg, J. and Geddes, C.G.R. and Toth, C. and Esarey, E. and Schroeder, C.B. and Martin, M.C. and Hao, Z. and Leemans, W.P.},
abstractNote = {The observation and modeling of coherent transition radiation from femtosecond laser accelerated electron bunches is discussed. The coherent transition radiation, scaling quadratically with bunch charge, is generated as the electrons transit the plasma-vacuum boundary. Due to the limited transverse radius of the plasma boundary, diffraction effects will strongly modify the angular distribution and the total energy radiated is reduced compared to an infinite transverse boundary. The multi-nC electron bunches, concentrated in a length of a few plasma periods (several tens of microns), experience partial charge neutralization while propagating inside the plasma towards the boundary. This reduces the space-charge blowout of the beam, allowing for coherent radiation at relatively high frequencies (several THz). The charge distribution of the electron bunch at the plasma-vacuum boundary can be derived from Fourier analysis of the coherent part of the transition radiation spectrum. A Michelson interferometer was used to measure the coherent spectrum, and electron bunches with duration on the order of 50 fs (rms) were observed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Oct 22 00:00:00 EDT 2004},
month = {Fri Oct 22 00:00:00 EDT 2004}
}

Conference:
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