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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 ISHIKAWA, Takeo NISHITANI, Yoshinori KUSAMA, Atsuhiko SUKEGAWA, Manabu TAKECHI, Koji SHINOHARA, Anatoli KRASILNIKOV¹⁾, Yuri KASHUCK¹⁾, Mamiko SASAO²⁾, Mitsutaka ISOBE³⁾, Mamoru BABA²⁾ and Toshio ITOGA²⁾

Japan Atomic Energy Agency

1)

Troitsk Institute of Innovating and Fusion Research

2)

Department of Engineering, Tohoku University

3)

National Institute for Fusion Science

(Received 10 November 2006 / Accepted 8 March 2007 / Published 28 May 2007)

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.

Copyright (c) 2007 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

tokamak, JT-60U, negative-ion-based neutral beam, energetic ion, neutron, neutron profile measurement, natural diamond detector, neutral particle flux, Alfvén eigenmode, digital signal processing

DOI: 10.1585/pfr.2.019

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This paper may be cited as follows:

Masao ISHIKAWA, Takeo NISHITANI, Yoshinori KUSAMA, Atsuhiko SUKEGAWA, Manabu TAKECHI, Koji SHINOHARA, Anatoli KRASILNIKOV, Yuri KASHUCK, Mamiko SASAO, Mitsutaka ISOBE, Mamoru BABA and Toshio ITOGA, Plasma Fusion Res. 2, 019 (2007).