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Title: Note: Effect of photodiode aluminum cathode frame on spectral sensitivity in the soft x-ray energy band

Silicon photodiodes used for soft x-ray detection typically have a thin metal electrode partially covering the active area of the photodiode, which subtly alters the spectral sensitivity of the photodiode. As a specific example, AXUV4BST photodiodes from International Radiation Detectors have a 1.0 μm thick aluminum frame covering 19% of the active area of the photodiode, which attenuates the measured x-ray signal below ∼6 keV. This effect has a small systematic impact on the electron temperature calculated from measurements of soft x-ray bremsstrahlung emission from a high-temperature plasma. Although the systematic error introduced by the aluminum frame is only a few percent in typical experimental conditions on the Madison Symmetric Torus, it may be more significant for other instruments that use similar detectors.
Authors:
; ; ;  [1] ;  [2]
  1. Department of Physics, University of Wisconsin–Madison, Madison, Wisconsin 53706 (United States)
  2. Consorzio RFX, Associazione Euratom-ENEA per la Fusione, Padova (Italy)
Publication Date:
OSTI Identifier:
22314465
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALUMINIUM; BREMSSTRAHLUNG; CATHODES; ELECTRON TEMPERATURE; HOT PLASMA; KEV RANGE; MST DEVICE; PHOTODIODES; RADIATION DETECTORS; SENSITIVITY; SIGNALS; SILICON; SOFT X RADIATION; X-RAY DETECTION