Transmission Grating Measurements of Undulator K

Bionta, R. M.

SLAC National Accelerator Laboratory

关键词: Xfel;    43 Particle Accelerators;    Free Electron Lasers;    X-Ray Spectra;    Wiggler Magnets;   

DOI  :  10.2172/993726
RP-ID  :  SLAC-TN-10-064
RP-ID  :  AC02-76SF00515
RP-ID  :  993726

美国|英语

来源: UNT Digital Library

【 摘 要 】

This study was undertaken to understand the practicalities of determine K differences in the undulator modules by measuring single-shot x-ray spectra of the spontaneous radiation with a transmissive grating spectrometer under development to measure FEL spectra. Since the quality of the FEL is dependent on a uniform K value in all the undulator modules, being able to measure the relative undulator K values is important. Preliminary results were presented in a presentation, 'Use of FEL Off-Axis Zone Plate Spectrometer to Measure Relative K by the Pinhole/Centroid Method', at the 'LCLS Beam-Based Undulator K Measurements Workshop' on November 14, 2005 (UCRL-PRES-217281). This study applies equally well to reflective gratings of the appropriate period and inclinations.