JOURNAL ARTICLE

Conceptual design of a GEM (gas electron multiplier) based gas Cherenkov detector for measurement of 17 MeV gamma rays from T(D, γ)5He in magnetic confinement fusion plasmas.

  • Published In: Review of Scientific Instruments, 2023, v. 94, n. 1. P. 1 1 of 3

  • Database: Academic Search Ultimate 2 of 3

  • Authored By: Putignano, O.; Croci, G.; Muraro, A.; Cancelli, S.; Caruggi, F.; Gorini, G.; Grosso, G.; Kushoro, M. H.; Marcer, G.; Nocente, M.; Cippo, E. Perelli; Rebai, M.; Rigamonti, D.; Tardocchi, M. 3 of 3

Abstract

This article focuses on the development of a neutron-insensitive gamma-ray detector for measuring fusion power throughput in deuterium–tritium (DT) reactors by counting 17 MeV gamma rays from the T(D, γ)^5He reaction. The detector exploits the Cherenkov effect to detect gamma rays above 11 MeV while remaining insensitive to neutrons, which produce lower-energy particles below the Cherenkov threshold. A key innovation presented is a photon pre-amplifier based on a cesium iodide (CsI)-coated Gas Electron Multiplier (GEM) that amplifies and wavelength-shifts the Cherenkov photons to improve signal detection; simulations indicate that biasing the GEM foil at 1 kV achieves a photon gain of approximately 100. This design aims to enable real-time, neutron-independent fusion power measurements with improved accuracy and reduced shielding requirements, and the pre-amplifier is currently under construction for experimental testing.

Additional Information

  • Source:Review of Scientific Instruments. 2023/01, Vol. 94, Issue 1, p1
  • Document Type:Article
  • Subject Area:History
  • Publication Date:2023
  • ISSN:0034-6748
  • DOI:10.1063/5.0101761
  • Accession Number:161626458
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