Measurement of the single-shot pulse energy of a free electron laser using a cryogenic radiometer

The absolute single-shot pulse energy of the SPring 8 extreme ultraviolet (EUV) free electron laser (FEL) was measured using a cryogenic radiometer with a relative standard uncertainty of 3%. The temperature change of the cavity in the cryogenic radiometer caused by an incident FEL pulse was determi...

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Bibliographic Details
Published in:Metrologia 2010-10, Vol.47 (5), p.518-521
Main Authors: Kato, Masahiro, Saito, Norio, Tiedtke, Kai, Juranić, Pavle N, Sorokin, Andrey A, Richter, Mathias, Morishita, Yuichiro, Tanaka, Takahiro, Jastrow, Ulf, Kroth, Udo, Schöppe, Hendrik, Nagasono, Mitsuru, Yabashi, Makina, Tono, Kensuke, Togashi, Tadashi, Kimura, Hiroaki, Ohashi, Haruhiko, Ishikawa, Tetsuya
Format: Article
Language:English
Subjects:
Detectors
Electrons
Energy use
Free electron lasers
Holes
Lasers
Low temperature physics
Metrology
Radiometers
Radiometry
Springs
Wavelengths
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Summary:The absolute single-shot pulse energy of the SPring 8 extreme ultraviolet (EUV) free electron laser (FEL) was measured using a cryogenic radiometer with a relative standard uncertainty of 3%. The temperature change of the cavity in the cryogenic radiometer caused by an incident FEL pulse was determined using a lock-in amplifier and an ac Wheatstone bridge. The measured pulse energies were compared with a gas-monitor detector developed by Physikalisch-Technische Bundesanstalt/Deutsches Elektronen-Synchrotron/Ioffe Physico-Technical Institute (Ioffe) at a wavelength of 51.3 nm at the SPring-8 EUV-FEL in a shot-to-shot mode. The pulse energies measured using the two detectors agree within 2.0%. [PUBLICATION ABSTRACT]
ISSN:0026-1394
1681-7575
DOI:10.1088/0026-1394/47/5/002