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Title: Laser power meters as an X-ray power diagnostic for LCLS-II

For the LCLS-II X-ray instruments, laser power meters are being developed as compact X-ray power diagnostics to operate at soft and tender X-ray photon energies. These diagnostics can be installed at various locations along an X-ray free-electron laser (FEL) beamline in order to monitor the transmission of X-ray optics along the beam path. In addition, the power meters will be used to determine the absolute X-ray power at the endstations. Here, thermopile power meters, which measure average power, and have been chosen primarily for their compatibility with the high repetition rates at LCLS-II, are evaluated. Here, a number of characteristics in the soft X-ray range are presented including linearity, calibrations conducted with a photodiode and a gas monitor detector as well as ultra-high-vacuum compatibility tests using residual gas analysis. The application of these power meters for LCLS-II and other X-ray FEL sources is discussed.
Authors:
 [1] ;  [1] ;  [1] ; ORCiD logo [1] ;  [1] ;  [1] ;  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Journal of Synchrotron Radiation (Online)
Additional Journal Information:
Journal Name: Journal of Synchrotron Radiation (Online); Journal Volume: 25; Journal Issue: 1; Journal ID: ISSN 1600-5775
Publisher:
International Union of Crystallography
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; power meter; diagnostics; X-ray free electron laser
OSTI Identifier:
1417640

Heimann, Philip, Moeller, Stefan, Carbajo, Sergio, Song, Sanghoon, Dakovski, Georgi, Nordlund, Dennis, and Fritz, David. Laser power meters as an X-ray power diagnostic for LCLS-II. United States: N. p., Web. doi:10.1107/S1600577517014096.
Heimann, Philip, Moeller, Stefan, Carbajo, Sergio, Song, Sanghoon, Dakovski, Georgi, Nordlund, Dennis, & Fritz, David. Laser power meters as an X-ray power diagnostic for LCLS-II. United States. doi:10.1107/S1600577517014096.
Heimann, Philip, Moeller, Stefan, Carbajo, Sergio, Song, Sanghoon, Dakovski, Georgi, Nordlund, Dennis, and Fritz, David. 2018. "Laser power meters as an X-ray power diagnostic for LCLS-II". United States. doi:10.1107/S1600577517014096. https://www.osti.gov/servlets/purl/1417640.
@article{osti_1417640,
title = {Laser power meters as an X-ray power diagnostic for LCLS-II},
author = {Heimann, Philip and Moeller, Stefan and Carbajo, Sergio and Song, Sanghoon and Dakovski, Georgi and Nordlund, Dennis and Fritz, David},
abstractNote = {For the LCLS-II X-ray instruments, laser power meters are being developed as compact X-ray power diagnostics to operate at soft and tender X-ray photon energies. These diagnostics can be installed at various locations along an X-ray free-electron laser (FEL) beamline in order to monitor the transmission of X-ray optics along the beam path. In addition, the power meters will be used to determine the absolute X-ray power at the endstations. Here, thermopile power meters, which measure average power, and have been chosen primarily for their compatibility with the high repetition rates at LCLS-II, are evaluated. Here, a number of characteristics in the soft X-ray range are presented including linearity, calibrations conducted with a photodiode and a gas monitor detector as well as ultra-high-vacuum compatibility tests using residual gas analysis. The application of these power meters for LCLS-II and other X-ray FEL sources is discussed.},
doi = {10.1107/S1600577517014096},
journal = {Journal of Synchrotron Radiation (Online)},
number = 1,
volume = 25,
place = {United States},
year = {2018},
month = {1}
}