Simulation of helium supersonic molecular beam injection in tokamak plasma*

Abstract

To study helium (He) supersonic molecular beam injection (SMBI) into H-mode tokamak plasma, a simplified multicomponent-plasma model under the assumption of quasi-neutral condition is developed and implemented in the frame of BOUT ++. The simulation results show that He species propagate inwards after He SMBI, and are deposited at the bottom of the pedestal due to intensive ionization and weak spreading speed. It is found that almost all injected helium particles strip off all the bounded electrons. He species interact intensively with background plasma along the injection path during He SMBI, making deuterium ion density profile drop at the He-deposited location and resulting in a large electron temperature decreasing, but deuterium ion temperature decreasing a little at the top of the pedestal.

A nonlinear wave coupling algorithm and its programing and application in plasma turbulences

“…The study of plasma in a toroidal device involves with many aspects. [25][26][27][28] Here we choose the edge plasma turbulence data measured in an experiment on the toroidal device, and employ the present program to calculate and analyze the energy transfer in the turbulent system, so as to test the efficiency of the algorithm and program in practical application. Shown in Fig.…”