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Title: The seed energy fluctuation of hard X-ray self-seeding free electron laser

Abstract

Self-seeding free electron lasers (FELs) are capable of generating fully coherent X-ray pulses. Yet, the stability of output pulse energy of hard X-ray self-seeding (HXRSS) FEL is poor. This letter reports the seed energy stability investigation of HXRSS FEL. For the purpose of a more stable HXRSS FEL, this work suggests a relatively broad bandwidth ρ t of crystal monochromator, a relatively long electron bunch with energy jitter (r.m.s.) down to a quarter of FEL Pierce parameter ρ, and a larger Bragg angle θ B to improve the seed energy stability. Moreover, the angle jitter (r.m.s.) between the SASE pulse incident direction and the crystal surface should be less than (ρ tan θ B)/2, and the relative time jitter (r.m.s.) between the electron bunch and the seed should be less than half of the seed bump duration τ t.

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9]; ORCiD logo [5]
  1. Univ. of Science and Technology of China, Hefei (China); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States); Chinese Academy of Sciences (CAS), Shanghai (China)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States); Huazhong University of Science and Technology, Wuhan (China)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States); Chinese Academy of Sciences (CAS), Beijing (China)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  6. Seabreeze High School, Daytona Beach, FL (United States)
  7. Saratoga High School, Saratoga, CA (United States)
  8. Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Applied Physics; Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Advanced Research Inst.
  9. Univ. of Science and Technology of China, Hefei (China)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1527352
Alternate Identifier(s):
OSTI ID: 1503923
Grant/Contract Number:  
AC02-76SF00515; FWP-2013-SLAC-100164
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 9; Journal Issue: 3; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Yang, C., Wang, X., Tsai, C. -Y., Zhou, G., Zhang, Z., Krug, E. D., Li, A., Deng, H., He, D., and Wu, J. The seed energy fluctuation of hard X-ray self-seeding free electron laser. United States: N. p., 2019. Web. doi:10.1063/1.5091018.
Yang, C., Wang, X., Tsai, C. -Y., Zhou, G., Zhang, Z., Krug, E. D., Li, A., Deng, H., He, D., & Wu, J. The seed energy fluctuation of hard X-ray self-seeding free electron laser. United States. doi:10.1063/1.5091018.
Yang, C., Wang, X., Tsai, C. -Y., Zhou, G., Zhang, Z., Krug, E. D., Li, A., Deng, H., He, D., and Wu, J. Fri . "The seed energy fluctuation of hard X-ray self-seeding free electron laser". United States. doi:10.1063/1.5091018. https://www.osti.gov/servlets/purl/1527352.
@article{osti_1527352,
title = {The seed energy fluctuation of hard X-ray self-seeding free electron laser},
author = {Yang, C. and Wang, X. and Tsai, C. -Y. and Zhou, G. and Zhang, Z. and Krug, E. D. and Li, A. and Deng, H. and He, D. and Wu, J.},
abstractNote = {Self-seeding free electron lasers (FELs) are capable of generating fully coherent X-ray pulses. Yet, the stability of output pulse energy of hard X-ray self-seeding (HXRSS) FEL is poor. This letter reports the seed energy stability investigation of HXRSS FEL. For the purpose of a more stable HXRSS FEL, this work suggests a relatively broad bandwidth ρt of crystal monochromator, a relatively long electron bunch with energy jitter (r.m.s.) down to a quarter of FEL Pierce parameter ρ, and a larger Bragg angle θB to improve the seed energy stability. Moreover, the angle jitter (r.m.s.) between the SASE pulse incident direction and the crystal surface should be less than (ρ tan θB)/2, and the relative time jitter (r.m.s.) between the electron bunch and the seed should be less than half of the seed bump duration τt.},
doi = {10.1063/1.5091018},
journal = {AIP Advances},
issn = {2158-3226},
number = 3,
volume = 9,
place = {United States},
year = {2019},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

FIG. 1 FIG. 1: Seed energy fluctuation decrease as the function of the ration of ρt/ρ. Here, the crystal bandwidth ρt varies with the asymmetry ration γ for the (111) reflecting atomic planes. We neglect other factors leading to the seed fluctuation.

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Works referenced in this record:

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.