Application of AXUV diode detectors at ASDEX Upgrade

In the ASDEX Upgrade tokamak, a radiation measurement for a wide spectral range, based on semiconductor detectors, with 256 lines of sight and a time resolution of 5 μs was recently installed. In combination with the foil based bolometry, it is now possible to estimate the absolutely calibrated radi...

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Bibliographic Details
Published in:Review of scientific instruments 2014-03, Vol.85 (3), p.033503-033503
Main Authors: Bernert, M, Eich, T, Burckhart, A, Fuchs, J C, Giannone, L, Kallenbach, A, McDermott, R M, Sieglin, B
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ASDEX TOKAMAK
Bolometers
Calibration
COST
Degradation
Diagnostic systems
Diode detectors
Diodes
EDGE LOCALIZED MODES
ENERGY DEPENDENCE
FOILS
PHOTONS
Radiation detectors
Radiation effects
Radiation measurement
Scientific apparatus & instruments
SEMICONDUCTOR DETECTORS
Sensitivity
Sensors
TIME DEPENDENCE
TIME RESOLUTION
Tokamak devices
ULTRAVIOLET RADIATION
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Summary:In the ASDEX Upgrade tokamak, a radiation measurement for a wide spectral range, based on semiconductor detectors, with 256 lines of sight and a time resolution of 5 μs was recently installed. In combination with the foil based bolometry, it is now possible to estimate the absolutely calibrated radiated power of the plasma on fast timescales. This work introduces this diagnostic based on AXUV (Absolute eXtended UltraViolet) n-on-p diodes made by International Radiation Detectors, Inc. The measurement and the degradation of the diodes in a tokamak environment is shown. Even though the AXUV diodes are developed to have a constant sensitivity for all photon energies (1 eV-8 keV), degradation leads to a photon energy dependence of the sensitivity. The foil bolometry, which is restricted to a time resolution of less than 1 kHz, offers a basis for a time dependent calibration of the diodes. The measurements of the quasi-calibrated diodes are compared with the foil bolometry and found to be accurate on the kHz time scale. Therefore, it is assumed, that the corrected values are also valid for the highest time resolution (200 kHz). With this improved diagnostic setup, the radiation induced by edge localized modes is analyzed on fast timescales.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4867662