Energetic Particle Experiments in JT-60U and Their Implications for a Fusion Reactor
- 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, Vol. 42, Issue 2,3; 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
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Related Subjects
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