A new hard x-ray spectrometer for runaway electron measurements in tokamaks

the ASDEX Upgrade Team, the Eurofusion MST1 Team, the COMPASS Team, A. Dal Molin*, M. Nocente, M. Dalla Rosa, E. Panontin, D. Rigamonti, M. Tardocchi, A. Shevelev, E. Khilkevitch, M. Iliasova, L. Giacomelli, G. Gorini, E. Perelli Cippo, F. D’Isa, G. Pautasso, G. Papp, G. Tardini, E. MacusovaJ. Cerovsky, O. Ficker, M. Salewski, V. Kiptily

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Runaway electron gamma-ray detection system, a novel hard x-ray (HXR) spectrometer optimized for bremsstrahlung radiation measurement from runaway electrons in fusion plasmas, has been developed. The detector is based on a 1‘×1’ LaBr3:Ce scintillator crystal coupled with a photomultiplier tube. The system has an energy dynamic range exceeding 20 MeV with an energy resolution of 3% at 661.7 keV. The detector gain is stable even under severe loads, with a gain shift that stays below 3% at HXR counting rates in excess of 1 MCps. The performance of the system enables unprecedented studies of the time-dependent runaway electron energy distribution function, as shown in recent runaway electron physics experiments at the ASDEX Upgrade and COMPASS tokamaks.

Original languageEnglish
Article number085501
JournalMeasurement Science and Technology
Volume34
Issue number8
Number of pages11
ISSN0957-0233
DOIs
Publication statusPublished - 2023

Keywords

  • Nuclear instruments and methods for hot plasma diagnostics
  • Runaway electrons
  • X-ray detectors

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