Conceptual study of energy resolved x-ray measurement and electron temperature reconstruction on ITER with low voltage ionization chambers

D. Colette, D. Mazon, R. Barnsley, M. O'Mullane, A. Jardin, A. Sirinelli

Research output: Contribution to journalArticlepeer-review

Abstract

In tokamaks with tungsten-based plasma facing components, such as ITER, pollution of the plasma by heavy impurities is a major concern as it can lead to radiative breakdown. The radiation emitted by such impurities is mainly composed of x-rays in the [0.1; 100] keV range. A diagnostic allowing for the reconstruction of the impurity distribution is of high interest. The ITER requirements for the x-ray measurement system make it mandatory for the detector to provide spectral information. Due to the radiation environment during the ITER nuclear phase, advanced detectors exhibiting high resilience to neutrons and gamma rays, such as gas-filled detectors, are required. The use of Low Voltage Ionization Chambers (LVICs) for this purpose is investigated in this paper. Several anodes have been added to the detector in order to allow for spectral deconvolution. This article presents a conceptual study of the use of a multi-anode LVIC for energy resolved x-ray measurement on ITER. It covers the design of the multi-anode LVIC and its modeling, the method for spectral deconvolution, and its application to energy resolved x-ray tomography, as well as the computation of the electron temperature from the reconstructed local x-ray emissivity.
Original languageEnglish
Article number083511
Number of pages15
JournalReview of Scientific Instruments
Volume92
Issue number8
Early online date10 Aug 2021
DOIs
Publication statusPublished - 31 Aug 2021

Keywords

  • tokamaks
  • tungsten based plasma
  • x-ray tomography

Fingerprint

Dive into the research topics of 'Conceptual study of energy resolved x-ray measurement and electron temperature reconstruction on ITER with low voltage ionization chambers'. Together they form a unique fingerprint.

Cite this