Plasma and Fusion Research
Online ISSN : 1880-6821
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Neutron Emission Profile Measurement and Fast Charge Exchange Neutral Particle Flux Measurement for Transport Analysis of Energetic Ions in JT-60U
Masao ISHIKAWATakeo NISHITANIYoshinori KUSAMAAtsuhiko SUKEGAWAManabu TAKECHIKoji SHINOHARAAnatoli KRASILNIKOVYuri KASHUCKMamiko SASAOMitsutaka ISOBEMamoru BABAToshio ITOGA
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2007 Volume 2 Pages 019

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Abstract

This paper describes diagnostics for transport analysis of energetic ions in JT-60U. Line integrated neutron emission profiles are measured using Stilbene neutron detectors, which are installed as a neutron emission profile monitor. The flux and energy distribution of charge exchange neutral particles are measured using a natural diamond detector (NDD). These measurements in the presence of bursting instabilities in the frequency range of Alfvén Eigenmode induced by negative-ion-based neutral beam injection, which are called Abrupt Large-amplitude Events, indicate that energetic ions are transported from the core region in the plasma due to a resonance interaction between energetic ions and the instabilities. Development of a digital signal processing (DSP) system for a neutron detector and a NDD enabling a sampling rate in the MHz class is proceeding. The DSP system for the neutron detector successfully discriminates between neutrons and gamma-rays in tests using neutron/gamma-ray sources.

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© 2007 by The Japan Society of Plasma Science and Nuclear Fusion Research
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