Energetic Particle Experiments in JT-60U and Their Implications for a Fusion Reactor

Journal Article · Sun Sep 15 04:00:00 EDT 2002 · Fusion Science and Technology

OSTI ID:20845855

Tobita, K; Kusama, Y; Shinohara, K; Nishitani, T; Kimura, H; Kramer, G J; Nemoto, M; Kondoh, T; Oikawa, T; Morioka, A; Hamamatsu, K; Wang, S; Takeji, S; Takechi, M; Ishikawa, M; Tani, K; Saigusa, M; Ozeki, T ^[1]

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1. Japan Atomic Energy Research Institute (Japan)

Energetic particle experiments in JT-60U are summarized, mainly covering ripple loss and Alfven eigenmodes (AE modes). Significant loss was observed for 85 keV neutral beam injected (NBI) ions and fusion-produced tritons as toroidal field ripple at the plasma surface increased, especially in a reversed shear plasma. Measurement of hot spots on the first wall due to ripple loss confirmed agreement with code predictions, validating the modeling incorporated in an orbit-following Monte Carlo code. A variety of AE modes were destabilized in ion cyclotron range of frequencies (ICRF) minority heating and negative-ion-based NBI (N-NBI) heating. Most of the observed modes are gap modes identified to be toroidicity-induced, ellipticity-induced, and triangularity-induced AE modes. An interesting finding is pulsating modes accompanying frequency sweep, which were destabilized by N-NBI and sometimes induced a beam ion loss of up to 25%. Also presented are energetic particle issues in auxiliary heating with ICRF and N-NBI.

• OSTI ID: 20845855
• Journal Information: Fusion Science and Technology, Journal Name: Fusion Science and Technology Journal Issue: 2,3 Vol. 42; ISSN 1536-1055
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANIONS
AUXILIARY HEATING
BEAM INJECTION HEATING
COMPUTERIZED SIMULATION
FIRST WALL
HOT SPOTS
ICR HEATING
ION CYCLOTRON-RESONANCE
JT-60U TOKAMAK
KEV RANGE
MONTE CARLO METHOD
NEUTRAL ATOM BEAM INJECTION
PLASMA
PLASMA SIMULATION
REVERSED SHEAR
THERMONUCLEAR REACTORS
TRITONS