Development of the PARASOL code and full particle simulation of tokamak plasma with an open-field SOL-divertor region using PARASOL

PARASOLコードの開発と開磁場のSOL-ダイバータ領域を持つトカマクプラズマのPARASOLによる完全粒子シミュレーション

滝塚 知典

Takizuka, Tomonori

核融合トカマク炉の熱・粒子制御を担うSOL-ダイバータ領域まで含めてシミュレーションすることができる粒子コードPARASOLのモデルの概要と、このコードによるこれまでのシミュレーション研究について述べる。プラズマ-壁境界における流速、SOL中の熱輸送及びELMの過渡輸送について1次元シミュレーションを行ってきた。2次元シミュレーションでは、SOL中の流れの構造及び全トカマクプラズマ中の電場形成について調べてきた。これらのPARASOLシミュレーションの結果は流体シミュレーションのための物理モデル構築に活用された。

In order to investigate the particle and heat control with divertor system of fusion reactors, numerical simulations have been widely carried out. Fluid codes require further improvement of physics modeling for edge plasmas. The full particle simulation is powerful to study fundamental physics of open-field SOL-divertor plasmas as well as of the whole tokamak plasma including SOL-divertor region. PARASOL code with PIC method and binary collision model has been developed in JAERI and JAEA. Simulations with PARASOL code have been carried out for the above purpose. The one-dimensional (1D) version of PARASOL was applied to investigate the Bohm criterion, the supersonic flow, the SOL heat conduction, and so on. The ELM heat propagation was studied with the 1D-dynamic PARASOL. The two-dimensional version of PARASOL for the whole tokamak plasma with SOL-divertor region was useful to simulate the SOL flow pattern, the electric field formation etc. Based on PARASOL simulation results, physics modeling for the fluid simulation has been developed.