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Oct 13 – 18, 2014
Hotel Park Inn Pribaltiyskaya
Europe/Moscow timezone

Simulations and Validations of Transport during Fueling by SMBI in HL-2A Tokamak

Oct 17, 2014, 8:30 AM
4h
Green 8-9 (Hotel Park Inn Pribaltiyskaya)

Green 8-9

Hotel Park Inn Pribaltiyskaya

Saint Petersburg, Russian Federation
Poster Poster 7

Speaker

Dr Zhanhui Wang (Southwestern Institute of Physics)

Description

Plasma fueling with higher efficiency and deeper injection is crucial to enable fusion power performance requirements at high density for next generation devices such as ITER. In BOUT++ code framework, a new module (named trans-neut) has been developed to deal with neutrals and plasmas transport during fueling of supersonic molecular beam injection (SMBI) or gas puffing(GP). It modifies the BOUT++ code of boundary plasma turbulence to study the dynamics of neutrals transport and their interactions with plasma during fueling. Results of calculations have been done for the realistic divertor geometry of the HL-2A tokamak. A seven-field fluid model coupling plasma density, heat, and momentum transport equations together with neutral density and momentum transport equations for both molecules and atoms has been developed. Collisional interactions between molecules, atoms, and plasma have been included such as dissociation, ionization, recombination and charge-exchange reactions. During SMBI, neutral molecules and atoms propagate inwards continuously across the separatrix and penetrate about 4cm inside the separatrix where the propagating front of molecules stagnates due to the total molecule dissociation rate balancing with the molecule injection rate. Both positive and negative parallel ion velocities are driven near SMBI region due to parallel pressure gradient, which provides convection for parallel plasma density transport. The poloidal propagation of plasma density blobs (i.e., source) and ion temperature holes (i.e., sink) has been observed. The simulations of mean profiles variations during SMBI have been compared and validated with HL-2A experiment results which are consistent qualitatively well with each other.
Country or International Organisation China
Paper Number TH/P7-30

Primary author

Dr Zhanhui Wang (Southwestern Institute of Physics)

Co-authors

Dr Aiping Sun (Southwestern Institute of physics) Dr Deliang Yu (Southwestern Institute of Physics) Dr Guoyao Zheng (No.3,3rd Section, South of 2nd Ring Road, Chengdu, Sichuan ,610041, China) Prof. Jiaqi Dong (Southwestern Institute of Physics) Mr Jie Huang (Sichuan University) Prof. Lianghua Yao (Southwestern Institute of Physics) Mr Min Xu (Southwestern Institute of Physics) Dr Shaoyong Chen (Sichuan University) Ms Tiantian Sun (Sichuan University) Mr Tianyang XIa (Institute of Plasma Physics, Chinese Academy of Sciences) Mr Wulu Zhong (Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China) Xueqiao Xu (Lawrence Livermore National Laboratory) Dr Zhongbing Shi (Southwestern Institute of Physics)

Presentation materials