Transmission Grating Measurements of Undulator K

Bionta, R M ; Ott, L L

Lawrence Livermore National Laboratory

关键词: Spectrometers;    Spectra;    43 Particle Accelerators;    42 Engineering;    71 Classical And Quantum Mechanics, General Physics;   

DOI  :  10.2172/899383
RP-ID  :  UCRL-TR-221499
RP-ID  :  W-7405-ENG-48
RP-ID  :  899383

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.