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Title: Electron Beam Alignment Strategy in the LCLS Undulators

Abstract

The x-ray FEL process puts very tight tolerances on the straightness of the electron beam trajectory (2 {micro}m rms) through the LCLS undulator system. Tight but less stringent tolerances of 80 {micro}m rms vertical and 140 {micro}m rms horizontally are to be met for the placement of the individual undulator segments with respect to the beam axis. The tolerances for electron beam straightness can only be met through beam-based alignment (BBA) based on electron energy variations. Conventional alignment will set the start conditions for BBA. Precision-fiducialization of components mounted on remotely adjustable girders and the use of beam-finder wires (BFW) will satisfy placement tolerances. Girder movement due to ground motion and temperature changes will be monitored continuously by an alignment monitoring system (ADS) and remotely corrected. This stabilization of components as well as the monitoring and correction of the electron beam trajectory based on BPMs and correctors will increase the time between BBA applications. Undulator segments will be periodically removed from the undulator Hall and measured to monitor radiation damage and other effects that might degrade undulator tuning.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
896941
Report Number(s):
SLAC-PUB-12098
TRN: US200705%%82
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Invited talk at 28th International Free Electron Laser Conference (FEL 2006), Berlin, Germany, 27 Aug - 1 Sep 2006
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ALIGNMENT; ELECTRON BEAMS; ELECTRONS; FREE ELECTRON LASERS; GROUND MOTION; MONITORING; MONITORS; RADIATIONS; STABILIZATION; TUNING; WIGGLER MAGNETS; Other,XFEL

Citation Formats

Nuhn, H.-D., Emma, P.J., Gassner, G.L., LeCocq, C.M., Peters, E., Ruland, R.E., and /SLAC. Electron Beam Alignment Strategy in the LCLS Undulators. United States: N. p., 2007. Web.
Nuhn, H.-D., Emma, P.J., Gassner, G.L., LeCocq, C.M., Peters, E., Ruland, R.E., & /SLAC. Electron Beam Alignment Strategy in the LCLS Undulators. United States.
Nuhn, H.-D., Emma, P.J., Gassner, G.L., LeCocq, C.M., Peters, E., Ruland, R.E., and /SLAC. Wed . "Electron Beam Alignment Strategy in the LCLS Undulators". United States. doi:. https://www.osti.gov/servlets/purl/896941.
@article{osti_896941,
title = {Electron Beam Alignment Strategy in the LCLS Undulators},
author = {Nuhn, H.-D. and Emma, P.J. and Gassner, G.L. and LeCocq, C.M. and Peters, E. and Ruland, R.E. and /SLAC},
abstractNote = {The x-ray FEL process puts very tight tolerances on the straightness of the electron beam trajectory (2 {micro}m rms) through the LCLS undulator system. Tight but less stringent tolerances of 80 {micro}m rms vertical and 140 {micro}m rms horizontally are to be met for the placement of the individual undulator segments with respect to the beam axis. The tolerances for electron beam straightness can only be met through beam-based alignment (BBA) based on electron energy variations. Conventional alignment will set the start conditions for BBA. Precision-fiducialization of components mounted on remotely adjustable girders and the use of beam-finder wires (BFW) will satisfy placement tolerances. Girder movement due to ground motion and temperature changes will be monitored continuously by an alignment monitoring system (ADS) and remotely corrected. This stabilization of components as well as the monitoring and correction of the electron beam trajectory based on BPMs and correctors will increase the time between BBA applications. Undulator segments will be periodically removed from the undulator Hall and measured to monitor radiation damage and other effects that might degrade undulator tuning.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 03 00:00:00 EST 2007},
month = {Wed Jan 03 00:00:00 EST 2007}
}

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