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Title: Transverse-Longitudinal Phase-Space Manipulations and Correlations

Abstract

Manipulations on transverse and longitudinal phase-space distribution of an electron beam are discussed within the constraints imposed by symplectic conditions. A few examples are presented: transverse-longitudinal emittance exchange to improve performance of a high-gain free-electron laser (FEL) for hard x-rays, and the flat beam technique and its application to compact Terahertz devices and ultrashort-pulse generation. It is shown that emittance transfer to some degree would be advantageous for FELs and that introducing correlations would allow just such transfers. Also, it is shown that transverse-longitudinal correlations would be distinctly advantageous for FELs. Conventional and exotic methods of producing such correlations are described. Practical difficulties associated with each of the conventional methods are described, although the nonconventional methods appear to hold promise.

Authors:
 [1];  [2]
  1. Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439 (United States)
  2. Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States)
Publication Date:
OSTI Identifier:
20798385
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 821; Journal Issue: 1; Conference: COOL05: International workshop on beam cooling and related topics, Galena, IL (United States), 18-23 Sep 2005; Other Information: DOI: 10.1063/1.2190100; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BEAM COOLING; COMPACTS; CORRELATIONS; DISTRIBUTION; ELECTRON BEAMS; FREE ELECTRON LASERS; GAIN; HARD X RADIATION; LASER RADIATION; PERFORMANCE; PHASE SPACE; PULSES; THZ RANGE

Citation Formats

Kim, Kwang-Je, and Sessler, Andrew. Transverse-Longitudinal Phase-Space Manipulations and Correlations. United States: N. p., 2006. Web. doi:10.1063/1.2190100.
Kim, Kwang-Je, & Sessler, Andrew. Transverse-Longitudinal Phase-Space Manipulations and Correlations. United States. doi:10.1063/1.2190100.
Kim, Kwang-Je, and Sessler, Andrew. Mon . "Transverse-Longitudinal Phase-Space Manipulations and Correlations". United States. doi:10.1063/1.2190100.
@article{osti_20798385,
title = {Transverse-Longitudinal Phase-Space Manipulations and Correlations},
author = {Kim, Kwang-Je and Sessler, Andrew},
abstractNote = {Manipulations on transverse and longitudinal phase-space distribution of an electron beam are discussed within the constraints imposed by symplectic conditions. A few examples are presented: transverse-longitudinal emittance exchange to improve performance of a high-gain free-electron laser (FEL) for hard x-rays, and the flat beam technique and its application to compact Terahertz devices and ultrashort-pulse generation. It is shown that emittance transfer to some degree would be advantageous for FELs and that introducing correlations would allow just such transfers. Also, it is shown that transverse-longitudinal correlations would be distinctly advantageous for FELs. Conventional and exotic methods of producing such correlations are described. Practical difficulties associated with each of the conventional methods are described, although the nonconventional methods appear to hold promise.},
doi = {10.1063/1.2190100},
journal = {AIP Conference Proceedings},
number = 1,
volume = 821,
place = {United States},
year = {Mon Mar 20 00:00:00 EST 2006},
month = {Mon Mar 20 00:00:00 EST 2006}
}
  • Manipulations on transverse and longitudinal phase-space distribution of an electron beam are discussed within the constraints imposed by symplectic conditions. A few examples are presented: transverse-longitudinal emittance exchange to improve performance of a high-gain free-electron laser (FEL) for hard x-rays, and the flat beam technique and its application to compact Terahertz devices and ultrashort-pulse generation. It is shown that emittance transfer to some degree would be advantageous for FELs and that introducing correlations would allow just such transfers. Also, it is shown that transverse-longitudinal correlations would be distinctly advantageous for FELs. Conventional and exotic methods of producing such correlations aremore » described. Practical difficulties associated with each of the conventional methods are described, although the nonconventional methods appear to hold promise.« less
  • This paper studies the increase in beam transverse phase space due to the space charge and coupling of transverse and longitudinal particle oscillations by mathematical modeling of particle motion. The regions of predominant influence of the space charge and oscillation coupling on the increase in the transverse phase space are determined in the plane of the coupling parameter and Coulomb parameter. It is shown that filtering of the transverse phase space in accelerating-focusing channels with weak coupling is effective in the range of Coulomb parameters from 0 to 0.3-0.4.
  • We propose a general method for tailoring the current distribution of relativistic electron bunches. The technique relies on a recently proposed method to exchange the longitudinal phase space emittance with one of the transverse emittances. The method consists of transversely shaping the bunch and then converting its transverse profile into a current profile via a transverse-to-longitudinal phase-space-exchange beamline. We show that it is possible to tailor the current profile to follow, in principle, any desired distributions. We demonstrate, via computer simulations, the application of the method to generate trains of microbunches with tunable spacing and linearly-ramped current profiles. We alsomore » briefly explore potential applications of the technique.« less
  • We report on the experimental generation of a train of subpicosecond electron bunches. The bunch train generation is accomplished using a beamline capable of exchanging the coordinates between the horizontal and longitudinal degrees of freedom. An initial beam consisting of a set of horizontally-separated beamlets is converted into a train of bunches temporally separated with tunable bunch duration and separation. The experiment reported in this Letter unambiguously demonstrates the conversion process and its versatility.