Time-resolved imaging of the microbunching instability and energy spread at the Linac Coherent Light Source
Abstract
The microbunching instability (MBI) is a well known problem for high brightness electron beams and has been observed at accelerator facilities around the world. Free-electron lasers (FELs) are particularly susceptible to MBI, which can distort the longitudinal phase space and increase the beam’s slice energy spread (SES). Past studies of MBI at the Linac Coherent Light Source (LCLS) relied on optical transition radiation to infer the existence of microbunching. With the development of the x-band transverse deflecting cavity (XTCAV), we can for the first time directly image the longitudinal phase space at the end of the accelerator and complete a comprehensive study of MBI, revealing both detailed MBI behavior as well as insights into mitigation schemes. The fine time resolution of the XTCAV also provides the first LCLS measurements of the final SES, a critical parameter for many advanced FEL schemes. As a result, detailed MBI and SES measurements can aid in understanding MBI mechanisms, benchmarking simulation codes, and designing future high- brightness accelerators.
- Authors:
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1181518
- Alternate Identifier(s):
- OSTI ID: 1169454
- Report Number(s):
- SLAC-PUB-16213
Journal ID: ISSN 1098-4402; PRABFM; 030704
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- 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: 3; Journal ID: ISSN 1098-4402
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; ACCPHY; XFEL
Citation Formats
Ratner, D., Behrens, C., Ding, Y., Huang, Z., Marinelli, A., Maxwell, T., and Zhou, F. Time-resolved imaging of the microbunching instability and energy spread at the Linac Coherent Light Source. United States: N. p., 2015.
Web. doi:10.1103/PhysRevSTAB.18.030704.
Ratner, D., Behrens, C., Ding, Y., Huang, Z., Marinelli, A., Maxwell, T., & Zhou, F. Time-resolved imaging of the microbunching instability and energy spread at the Linac Coherent Light Source. United States. https://doi.org/10.1103/PhysRevSTAB.18.030704
Ratner, D., Behrens, C., Ding, Y., Huang, Z., Marinelli, A., Maxwell, T., and Zhou, F. Mon .
"Time-resolved imaging of the microbunching instability and energy spread at the Linac Coherent Light Source". United States. https://doi.org/10.1103/PhysRevSTAB.18.030704.
@article{osti_1181518,
title = {Time-resolved imaging of the microbunching instability and energy spread at the Linac Coherent Light Source},
author = {Ratner, D. and Behrens, C. and Ding, Y. and Huang, Z. and Marinelli, A. and Maxwell, T. and Zhou, F.},
abstractNote = {The microbunching instability (MBI) is a well known problem for high brightness electron beams and has been observed at accelerator facilities around the world. Free-electron lasers (FELs) are particularly susceptible to MBI, which can distort the longitudinal phase space and increase the beam’s slice energy spread (SES). Past studies of MBI at the Linac Coherent Light Source (LCLS) relied on optical transition radiation to infer the existence of microbunching. With the development of the x-band transverse deflecting cavity (XTCAV), we can for the first time directly image the longitudinal phase space at the end of the accelerator and complete a comprehensive study of MBI, revealing both detailed MBI behavior as well as insights into mitigation schemes. The fine time resolution of the XTCAV also provides the first LCLS measurements of the final SES, a critical parameter for many advanced FEL schemes. As a result, detailed MBI and SES measurements can aid in understanding MBI mechanisms, benchmarking simulation codes, and designing future high- brightness accelerators.},
doi = {10.1103/PhysRevSTAB.18.030704},
journal = {Physical Review Special Topics. Accelerators and Beams},
number = 3,
volume = 18,
place = {United States},
year = {Mon Mar 09 00:00:00 EDT 2015},
month = {Mon Mar 09 00:00:00 EDT 2015}
}
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https://doi.org/10.1103/PhysRevSTAB.18.030704
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