Absolute calibration of sniffer probes on Wendelstein 7-X

Here we report the first measurements of the power levels of stray radiation in the vacuum vessel of Wendelstein 7-X using absolutely calibrated sniffer probes. The absolute calibration is achieved by using calibrated sources of stray radiation and the implicit measurement of the quality factor of t...

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Bibliographic Details
Published in:Review of scientific instruments 2016-08, Vol.87 (8), p.083505-083505
Main Authors: Moseev, D., Laqua, H. P., Marsen, S., Stange, T., Braune, H., Erckmann, V., Gellert, F., Oosterbeek, J. W.
Format: Article
Language:English
Subjects:
BEAMS
CALIBRATION
Coefficients
CONTAINERS
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
PROBES
Q factors
QUALITY FACTOR
Radiation measurement
Scientific apparatus & instruments
STRAY RADIATION
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Summary:Here we report the first measurements of the power levels of stray radiation in the vacuum vessel of Wendelstein 7-X using absolutely calibrated sniffer probes. The absolute calibration is achieved by using calibrated sources of stray radiation and the implicit measurement of the quality factor of the Wendelstein 7-X empty vacuum vessel. Normalized absolute calibration coefficients agree with the cross-calibration coefficients that are obtained by the direct measurements, indicating that the measured absolute calibration coefficients and stray radiation levels in the vessel are valid. Close to the launcher, the stray radiation in the empty vessel reaches power levels up to 340 kW/m2 per MW injected beam power. Furthest away from the launcher, i.e., half a toroidal turn, still 90 kW/m2 per MW injected beam power is measured.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4960349