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Title: Reference Undulator Measurement Results

Reference Undulator Measurement Results The LCLS reference undulator has been measured 22 times during the course of undulator tuning. These measurements provide estimates of various statistical errors. This note gives a summary of the reference undulator measurements and it provides estimates of the undulator tuning errors. We measured the reference undulator many times during the tuning of the LCLS undulators. These data sets give estimates of the random errors in the tuned undulators. The measured trajectories in the reference undulator are stable and straight to within {+-}2 {micro}m. Changes in the phase errors are less than {+-}2 deg between data sets. The phase advance in the cell varies by less than {+-}2 deg between data sets. The rms variation between data sets of the first integral of B{sub x} is 9.98 {micro}Tm, and the rms variation of the second integral of B{sub x} is 17.4 {micro}Tm{sup 2}. The rms variation of the first integral of B{sub y} is 6.65 {micro}Tm, and the rms variation of the second integral of B{sub y} is 12.3 {micro}Tm{sup 2}. The rms variation of the x-position of the fiducialized beam axis is 35 {micro}m in the final production run This corresponds to an rms uncertainty in the K value more » of {Delta}K/K = 2.7 x 10{sup -5}. The rms variation of the y-position of the fiducialized beam axis is 4 {micro}m in the final production run. « less
Authors: ; ; ;
Publication Date:
OSTI Identifier:1022520
Report Number(s):SLAC-TN-10-031
TRN: US1104461
DOE Contract Number:AC02-76SF00515
Resource Type:Technical Report
Data Type:
Research Org:SLAC National Accelerator Laboratory (SLAC)
Sponsoring Org:US DOE Office of Science (DOE SC)
Country of Publication:United States
Language:English
Subject: 43 PARTICLE ACCELERATORS; PRODUCTION; TRAJECTORIES; TUNING; WIGGLER MAGNETS XFEL