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.

Chugunov, I., Shevelev, A., Gin, D., Kiptily, V., Gorini, G., Nocente, M., et al. (2011). Development of Gamma-Ray Diagnostics for ITER. NUCLEAR FUSION, 51(8), 083010 [10.1088/0029-5515/51/8/083010].

Development of Gamma-Ray Diagnostics for ITER

GORINI, GIUSEPPE;NOCENTE, MASSIMO;
2011

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.
Articolo in rivista - Articolo scientifico
Scientifica
Gamma-Ray; ITER
English
Chugunov, I., Shevelev, A., Gin, D., Kiptily, V., Gorini, G., Nocente, M., et al. (2011). Development of Gamma-Ray Diagnostics for ITER. NUCLEAR FUSION, 51(8), 083010 [10.1088/0029-5515/51/8/083010].
Chugunov, I; Shevelev, A; Gin, D; Kiptily, V; Gorini, G; Nocente, M; Tardocchi, M; Doinikov, D; Naidenov, V; Khilkevitch, E
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/28171
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