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}
}
Web of Science
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