Abstract
Plasma fueling by gas puffing on HL-2A tokamak is studied by using the SOLPS code package. The injected molecular D2 is simulated by the kinetic neutral transport code Eirene and the plasma is modeled by the multi-fluid plasma transport code B2.5. By adjusting the radial transport coefficients D⊥ and χ⊥, the HL-2A experimental upstream plasma is well reproduced, which is taken as the initial state before gas puffing. The plasma and neutral evolution during the gas puffing and its impact on the divertor plasma are studied. It is found that the D2 can only penetrate into a very shallow region, however, the atomic D produced mainly by the dissociation can enhance the neutral D penetration depth, thus fuels the core plasma. Moreover, the impact of the gas puffing rate on the plasma is presented and discussed.
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