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Title: Trajectory Stability Modeling And Tolerances in the LCLS

Abstract

To maintain stable performance of the Linac Coherent Light Source (LCLS) x-ray free-electron laser, one must control the electron trajectory stability through the undulator to a small fraction of the beam size. BPM-based feedback loops running at 120 Hz will be effective in controlling jitter at low frequencies less than a few Hz. On the other hand, linac and injector stability tolerances must be chosen to limit jitter at higher frequencies. In this paper we study possible sources of high frequency jitter, including: (1) steering coil current regulation; (2) quadrupole magnet transverse vibrations; (3) quadrupole current regulation with transverse misalignments; (4) charge variations coupled to jitter through transverse wakefields of misaligned RF structures; and (5) bunch length variations coupled through coherent synchrotron radiation in the bunch compressor chicanes. Based on this study, we set component tolerances and estimate expected trajectory stability in the LCLS.

Authors:
; ;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
902722
Report Number(s):
SLAC-PUB-12491
TRN: US0703084
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Prepared for European Particle Accelerator Conference (EPAC 06), Edinburgh, Scotland, 26-30 Jun 2006
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; LINEAR ACCELERATORS; FREE ELECTRON LASERS; LIGHT SOURCES; PERFORMANCE; COMPUTERIZED SIMULATION; STABILITY; ELECTRON BEAMS; BEAM DYNAMICS; Accelerators,ACCPHY

Citation Formats

Wu, J., Emma, P., and /SLAC. Trajectory Stability Modeling And Tolerances in the LCLS. United States: N. p., 2007. Web.
Wu, J., Emma, P., & /SLAC. Trajectory Stability Modeling And Tolerances in the LCLS. United States.
Wu, J., Emma, P., and /SLAC. Fri . "Trajectory Stability Modeling And Tolerances in the LCLS". United States. doi:. https://www.osti.gov/servlets/purl/902722.
@article{osti_902722,
title = {Trajectory Stability Modeling And Tolerances in the LCLS},
author = {Wu, J. and Emma, P. and /SLAC},
abstractNote = {To maintain stable performance of the Linac Coherent Light Source (LCLS) x-ray free-electron laser, one must control the electron trajectory stability through the undulator to a small fraction of the beam size. BPM-based feedback loops running at 120 Hz will be effective in controlling jitter at low frequencies less than a few Hz. On the other hand, linac and injector stability tolerances must be chosen to limit jitter at higher frequencies. In this paper we study possible sources of high frequency jitter, including: (1) steering coil current regulation; (2) quadrupole magnet transverse vibrations; (3) quadrupole current regulation with transverse misalignments; (4) charge variations coupled to jitter through transverse wakefields of misaligned RF structures; and (5) bunch length variations coupled through coherent synchrotron radiation in the bunch compressor chicanes. Based on this study, we set component tolerances and estimate expected trajectory stability in the LCLS.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Apr 27 00:00:00 EDT 2007},
month = {Fri Apr 27 00:00:00 EDT 2007}
}

Conference:
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