The Energetic beam-driven instability, kinetic nonlinearities and subcritical instability in JT-60U

JT60Uにおける高エネルギービーム駆動不安定性と運動論的非線形効果及び亜臨界不安定性

Lesur, M.*; 井戸村 泰宏   ; 篠原 孝司; Garbet, X.*

Lesur, M.*; Idomura, Yasuhiro; Shinohara, Koji; Garbet, X.*

To investigate instabilities driven by high-energy particles in a fusion plasma, we apply the so-called Berk-Breizman model, which is an augmentation of the 1D Vlasov-Poisson system including distribution relaxation and extrinsic damping. The nonlinear evolution of numerical solutions featuring frequency sweeping is compared with JT-60U experiments. Similarities between simulation and experiment is found in the subcritical regime.