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Indexed by:期刊论文

Date of Publication:2018-11-01

Journal:FUSION ENGINEERING AND DESIGN

Included Journals:SCIE、CPCI-S

Volume:136

Issue:,SI

Page Number:1041-1046

ISSN No.:0920-3796

Key Words:Scrape-off layer; Gas puffing; Divertor; Fueling; Simulation

Abstract:Plasma fueling by gas puffing on HL-2A tokamak is studied by using the SOLPS code package. The injected molecular D-2 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-perpendicular to and chi(perpendicular to), 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 D-2 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.