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Title: Undulator Radiation Damage Experience at LCLS

The SLAC National Accelerator Laboratory has been running the Linac Coherent Light Source (LCLS), the first x-ray Free Electron Laser since 2009. Undulator magnet damage from radiation, produced by the electron beam traveling through the 133-m long straight vacuum tube, has been and is a concern. A damage measurement experiment has been performed in 2007 in order to obtain dose versus damage calibrations. Radiation reduction and detection devices have been integrated into the LCLS undulator system. The accumulated radiation dose rate was continuously monitored and recorded. In addition, undulator segments have been routinely removed from the beamline to be checked for magnetic (50 ppm, rms) and mechanic (about 0.25 µm, rms) changes. A reduction in strength of the undulator segments is being observed, at a level, which is now clearly above the noise. Recently, potential sources for the observed integrated radiation levels have been investigated. The paper discusses the results of these investigation as well as comparison between observed damage and measured dose accumulations and discusses, briefly, strategies for the new LCLS-II upgrade, which will be operating at more than 300 times larger beam rate.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
OSTI Identifier:
1167127
Report Number(s):
SLAC-PUB--16120
TRN: US1600036
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: 36. International Free Electron Laser Conference (FEL 2014), Basel (Switzerland), 25-29 Aug 2014
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
US DOE Office of Science (DOE SC);Basic Energy Sciences (BES)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; WIGGLER MAGNETS; RADIATION DOSES; STANFORD LINEAR ACCELERATOR CENTER; ELECTRON BEAMS; RADIATION EFFECTS; X RADIATION; FREE ELECTRON LASERS; LIGHT SOURCES; LINEAR ACCELERATORS; BUILDUP; CALIBRATION XFEL