MeV-range velocity-space tomography from gamma-ray and neutron emission spectrometry measurements at JET

M. Salewski, M Nocente, A. S. Jacobsen, F Binda, C Cazzaniga, G Ericsson, J. Eriksson, G Gorini, C Hellesen, A Hjalmarsson, V.G. Kiptily, T. Koskela, S.B. Korsholm, T. Kurki-Suonio, F. Leipold, J Madsen, D. Moseev, Stefan Kragh Nielsen, J Rasmussen, M SchneiderS.E. Sharapov, M. Stejner, M Tardocchi

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28 Citations (Scopus)

Abstract

We demonstrate the measurement of a 2D MeV-range ion velocity distribution function by velocity-space tomography at JET. Deuterium ions were accelerated into the MeV-range by third harmonic ion cyclotron resonance heating. We made measurements with three neutron emission spectrometers and a high-resolution γ-ray spectrometer detecting the γ-rays released in two reactions. The tomographic inversion based on these five spectra is in excellent agreement with numerical simulations with the ASCOT-RFOF and the SPOT-RFOF codes. The length of the measured fast-ion tail corroborates the prediction that very few particles are accelerated above 2 MeV due to the weak wave-particle interaction at higher energies.

Original languageEnglish
Article number056001
Pages (from-to)1-10
JournalNuclear Fusion
Volume57
Issue number5
DOIs
Publication statusPublished - 14 Mar 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • fast ions
  • neutron emission spectrometry
  • tokamak
  • velocity-space tomography
  • γ-ray spectrometry

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