Development of gamma-ray diagnostics for ITER

I.N. Chugunov, A.E. Shevelev, D.B. Gin, V.G. Kiptily, G. Gorini, M. Nocente, M. Tardocchi, D.N. Doinikov, V.O. Naidenov, E.M. Khilkevitch

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Abstract

Gamma-ray spectrometry is a diagnostic tool for fast ions in large tokamak plasmas. The information provided allows us to identify and simultaneously distinguish the presence of fast α-particles and other ions (H, D, T, 3He) to obtain information on their energy distribution and relative densities, in addition to performing a tomographic radial profile reconstruction of the γ-emission sources. The lack of vertical diagnostic ports in ITER makes the implementation of tomographic neutron and γ-ray systems more complicated. The use of a vertical divertor port for the implementation of a vertical viewpoint is currently suggested. The strong magnetic field (∼2 T) found there makes it hard to use conventional multi-dynode photomultipliers as light detectors. Instead, the use of micro-channel plate photomultipliers is suggested here. Investigations of the magnetic field impact on the performance of the γ-spectrometer with a micro-channel photomultiplier are carried out. A high-speed pulse height analysis technique, which allows us to trace gain changes in the photomultiplier tube, is developed at the Ioffe Institute. The tests demonstrate the feasibility of γ-spectrometric measurements in the divertor port provided that micro-channel photomultiplier detectors and the developed high-speed technique are used. © 2011 IAEA, Vienna.
Original languageEnglish
Article number083010
Pages (from-to)-
JournalNuclear Fusion
Volume51
Issue number8
DOIs
Publication statusPublished - Aug 2011
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Chugunov, I. N., Shevelev, A. E., Gin, D. B., Kiptily, V. G., Gorini, G., Nocente, M., ... Khilkevitch, E. M. (2011). Development of gamma-ray diagnostics for ITER. Nuclear Fusion, 51(8), -. [083010]. https://doi.org/10.1088/0029-5515/51/8/083010