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Numerical Analyses of Energetic Particles in LHD

Journal Article · · Fusion Science and Technology
OSTI ID:986435
 [1];  [2];  [2];  [2];  [3];  [4];  [1];  [1]
  1. National Institute for Fusion Science, Toki, Japan
  2. Kyoto University, Japan
  3. ORNL
  4. Nagoya University, Japan
+ Show Author Affiliations
The confinement of energetic ions generated by neutral beam injection (NBI) and ion cyclotron resonance frequency heating is studied using GNET simulation code, in which the drift kinetic equation is solved in five-dimensional phase-space. The steady-state distributions of the energetic ions are obtained, and characteristics of the energetic-ion distribution depending on the plasma heating method are shown. The magnetic configuration effect on the energetic-ion confinement is also investigated, and it is found that the energetic-ion confinement is improved by a strong inward shift of the magnetic axis position in the major radius direction. The interaction between energetic particles and Alfven eigenmodes are investigated using the MEGA code and the AE3D code. A reduced version of the MEGA code has been developed to simulate the Alfven eigenmode (AE) evolution in the Large Helical Device (LHD) plasma with NBI and collisions taken into account. The spatial profile and frequency of the AE modes in the LHD plasma are analyzed with the AE3D code. The evolution of energetic particles and AE mode amplitude and phase are followed in a self-consistent way, while the AE spatial profiles are assumed to be constant. It is demonstrated that the AE bursts can be simulated with the new code.
Research Organization:
Oak Ridge National Laboratory (ORNL)
Sponsoring Organization:
SC USDOE - Office of Science (SC)
DOE Contract Number:
AC05-00OR22725
OSTI ID:
986435
Journal Information:
Fusion Science and Technology, Journal Name: Fusion Science and Technology Journal Issue: 1 Vol. 58
Country of Publication:
United States
Language:
English

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Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
AMPLITUDES
BEAM INJECTION
CONFIGURATION
CONFINEMENT
DISTRIBUTION
HEATING
ION CYCLOTRON-RESONANCE
KINETIC EQUATIONS
PHASE SPACE
PLASMA
PLASMA HEATING
SIMULATION
TAIL IONS
stellarator energetic-ion MHD instability helical Alfven