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Title: Measurements and analysis of a high-brightness electron beam collimated in a magnetic bunch compressor

Abstract

A collimator located in a magnetic bunch compressor of a linear accelerator driven x-ray free electron laser has many potential applications, such as the removal of horns in the current distribution, the generation of ultrashort beams, and as a diagnostic of the beam slice emittance. Collective effects, however, are a major concern in applying the technique. Systematic measurements of emittance and analysis were performed using a collimator in the first bunch compressor of the Linac Coherent Light Source (LCLS). In the nominal, undercompressed configuration using the collimator we find that the y emittance (nonbending plane) is not increased, and the x emittance (in the bending plane) is increased by about 25%, in comparison to the injector emittance. From the analysis we conclude that the parasitic effects associated with this method are dominated by coherent synchrotron radiation (CSR), which causes a “systematic error” for measuring slice emittance at the bending plane using the collimation method. In general, we find good agreement between the measurements and simulations including CSR. However, for overcompressed beams at smaller collimator gaps, an extra emittance increase is found that does not agree with 1D simulations and is not understood.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1182829
Alternate Identifier(s):
OSTI ID: 1211618
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review Special Topics. Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Special Topics. Accelerators and Beams Journal Volume: 18 Journal Issue: 5; Journal ID: ISSN 1098-4402
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Zhou, F., Bane, K., Ding, Y., Huang, Z., Loos, H., and Raubenheimer, T. Measurements and analysis of a high-brightness electron beam collimated in a magnetic bunch compressor. United States: N. p., 2015. Web. doi:10.1103/PhysRevSTAB.18.050702.
Zhou, F., Bane, K., Ding, Y., Huang, Z., Loos, H., & Raubenheimer, T. Measurements and analysis of a high-brightness electron beam collimated in a magnetic bunch compressor. United States. https://doi.org/10.1103/PhysRevSTAB.18.050702
Zhou, F., Bane, K., Ding, Y., Huang, Z., Loos, H., and Raubenheimer, T. 2015. "Measurements and analysis of a high-brightness electron beam collimated in a magnetic bunch compressor". United States. https://doi.org/10.1103/PhysRevSTAB.18.050702.
@article{osti_1182829,
title = {Measurements and analysis of a high-brightness electron beam collimated in a magnetic bunch compressor},
author = {Zhou, F. and Bane, K. and Ding, Y. and Huang, Z. and Loos, H. and Raubenheimer, T.},
abstractNote = {A collimator located in a magnetic bunch compressor of a linear accelerator driven x-ray free electron laser has many potential applications, such as the removal of horns in the current distribution, the generation of ultrashort beams, and as a diagnostic of the beam slice emittance. Collective effects, however, are a major concern in applying the technique. Systematic measurements of emittance and analysis were performed using a collimator in the first bunch compressor of the Linac Coherent Light Source (LCLS). In the nominal, undercompressed configuration using the collimator we find that the y emittance (nonbending plane) is not increased, and the x emittance (in the bending plane) is increased by about 25%, in comparison to the injector emittance. From the analysis we conclude that the parasitic effects associated with this method are dominated by coherent synchrotron radiation (CSR), which causes a “systematic error” for measuring slice emittance at the bending plane using the collimation method. In general, we find good agreement between the measurements and simulations including CSR. However, for overcompressed beams at smaller collimator gaps, an extra emittance increase is found that does not agree with 1D simulations and is not understood.},
doi = {10.1103/PhysRevSTAB.18.050702},
url = {https://www.osti.gov/biblio/1182829}, journal = {Physical Review Special Topics. Accelerators and Beams},
issn = {1098-4402},
number = 5,
volume = 18,
place = {United States},
year = {Mon May 18 00:00:00 EDT 2015},
month = {Mon May 18 00:00:00 EDT 2015}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at https://doi.org/10.1103/PhysRevSTAB.18.050702

Citation Metrics:
Cited by: 12 works
Citation information provided by
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Works referenced in this record:

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