RADCAM—A radiation camera system combining foil bolometers, AXUV diodes, and filtered soft x-ray diodes

Measurements of radiated power are critical for characterizing and optimizing tokamak performance. The RADCAM system, comprising arrays of foil bolometers, Absolute eXtreme UltraViolet (AXUV), and filtered soft x-ray diodes, has been constructed to provide improved measurements of plasma radiation o...

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Bibliographic Details
Published in:Review of scientific instruments 2022-11, Vol.93 (11), p.113513-113513
Main Authors: Sheikh, U. A., Simons, L., Duval, B. P., Février, O., Moret, D., Allegrucci, A., Bernert, M., Crisinel, F., Tersztyánszky, T., Villinger, O.
Format: Article
Language:English
Subjects:
Bolometers
Calibration
Cameras
Diodes
Foils
Plasma radiation
Sensitivity
Soft x rays
Spatial resolution
Temporal resolution
Tokamak devices
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Summary:Measurements of radiated power are critical for characterizing and optimizing tokamak performance. The RADCAM system, comprising arrays of foil bolometers, Absolute eXtreme UltraViolet (AXUV), and filtered soft x-ray diodes, has been constructed to provide improved measurements of plasma radiation on “Tokamak a Configuration Variable” (TCV). An overview of the physical geometry, electronics, and design of the system is provided. The construction of the bolometer foils together with the improved sensitivity characteristics resulting from the inclusion of an anti-reflection carbon coating are presented. The large number of lines of sight in RADCAM are shown to significantly increase the spatial resolution over the legacy system. The system calibration procedure is detailed, and the mean system sensitivity is shown to vary by less than 5% over 1000 discharges. Additionally, the methodology for cross-calibration of the AXUV diodes with the bolometer foils is presented and applied to generate high temporal resolution measurements. The RADCAM radiation camera system is a compact, versatile system that is demonstrated to provide high resolution profiles of the radiated power in TCV.
ISSN:0034-6748
1089-7623
DOI:10.1063/5.0095907