Neutral Beam Injection Experiments and Related Behavior of Neutral Particles in the GAMMA 10 Tandem Mirror

Journal Article · Sat Jan 15 00:00:00 EST 2005 · Fusion Science and Technology

OSTI ID:20849807

Nakashima, Y ^[1]; Watanabe, K ^[1]; Higashizono, Y ^[1]; Ohki, T ^[1]; Ogita, T ^[1]; Shoji, M ^[2]; Kobayashi, S ^[3]; Islam, M K ^[1]; Kubota, Y ^[1]; Yoshikawa, M ^[1]; Kobayashi, T ^[1]; Yamada, M ^[1]; Murakami, R ^[1]; Cho, T ^[1]

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1. Plasma Research Center, University of Tsukuba (Japan)
2. National Institute for Fusion Science(Japan)
3. Institute of Advanced Energy, Kyoto University (Japan)

Results of neutral beam injection (NBI) experiments in the GAMMA 10 tandem mirror plasmas are presented together with the neutral particle behavior observed in the experiments. A hydrogen neural beam was injected into the hot-ion-mode plasmas by using the injector installed in the central-cell for the plasma heating and fueling. High-energy ions produced by NBI were observed and its energy distribution was measured for the first time with a neutral particle analyzer installed in the central-cell. The temporal and spatial behavior of hydrogen was observed with axially aligned H{sub {alpha}} detectors installed from the central midplane to anchor-cell. Enhancement of hydrogen recycling due to the beam injection and the cause of the observed decrease in plasma diamagnetism are discussed. The Monte-Carlo code DEGAS for neutral transport simulation was applied to the GAMMA 10 central-cell and a 3-dimensional simulation was performed in the NBI experiment. Localization of neutral particle during the beam injection is investigated based on the simulation and it was found that the increased recycling due to the beam injection was dominant near the injection port.

• OSTI ID: 20849807
• Journal Information: Fusion Science and Technology, Vol. 47, Issue 1T; Other Information: Copyright (c) 2006 American Nuclear Society (ANS), United States, All rights reserved. http://epubs.ans.org/; Country of input: International Atomic Energy Agency (IAEA); ISSN 1536-1055
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM INJECTION HEATING
COMPUTERIZED SIMULATION
D CODES
ENERGY SPECTRA
GAMMA 10 DEVICES
HYDROGEN
IONS
MONTE CARLO METHOD
NEUTRAL ATOM BEAM INJECTION
NEUTRAL PARTICLE ANALYZERS
NEUTRAL PARTICLES
PLASMA
PLASMA DIAMAGNETISM
PLASMA SIMULATION
RADIATION TRANSPORT
THREE-DIMENSIONAL CALCULATIONS