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Proceedings Paper

Laser power meters as x-ray intensity monitors for LCLS-II (Conference Presentation)
Author(s): Philip A. Heimann; Stefan P. Moeller; Sergio Carbajo Garcia; Sanghoon Song; Yiping Feng; James M. Glownia; David M. Fritz
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Paper Abstract

For the LCLS-II instruments we are developing laser power meters as compact intensity monitors that can operate at soft and tender X-ray photon energies. There is a need to monitor the relative X-ray intensity at various locations along an X-ray FEL beamline in order to observe a possible decrease in the reflectivity of X-ray mirrors. In addition for experiments, it is valuable to know the absolute intensity at the sample. There are two types of laser power meters based on thermopile and pyroelectric sensors. The thermopile power meters measure an average temperature and are compatible with the high repetition rates of LCLS-II. Pyroelectric power meters provide a pulse-by-pulse response. Ultra-high vacuum compatibility is being tested by residual gas analysis. An in-house development beamtime is being conducted at the LCLS SXR instrument. Measurements using both thermopile and pyroelectric power meters will be conducted at a set of photon energies in the soft X-ray range. The detectors’ response will be compared with the gas monitor detector installed at the SXR instrument.

Paper Details

Date Published: 16 June 2017
PDF: 1 pages
Proc. SPIE 10237, Advances in X-ray Free-Electron Lasers Instrumentation IV, 102370L (16 June 2017); doi: 10.1117/12.2265929
Show Author Affiliations
Philip A. Heimann, SLAC National Accelerator Lab. (United States)
Stefan P. Moeller, SLAC National Accelerator Lab. (United States)
Sergio Carbajo Garcia, SLAC National Accelerator Lab. (United States)
Sanghoon Song, SLAC National Accelerator Lab. (United States)
Yiping Feng, SLAC National Accelerator Lab. (United States)
James M. Glownia, SLAC National Accelerator Lab. (United States)
David M. Fritz, SLAC National Accelerator Lab. (United States)


Published in SPIE Proceedings Vol. 10237:
Advances in X-ray Free-Electron Lasers Instrumentation IV
Thomas Tschentscher; Luc Patthey, Editor(s)

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