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Title: Comparisons between tokamak fueling of gas puffing and supersonic molecular beam injection in 2D simulations

Plasma fueling with high efficiency and deep injection is very important to enable fusion power performance requirements. It is a powerful and efficient way to study neutral transport dynamics and find methods of improving the fueling performance by doing large scale simulations. Two basic fueling methods, gas puffing (GP) and supersonic molecular beam injection (SMBI), are simulated and compared in realistic divertor geometry of the HL-2A tokamak with a newly developed module, named trans-neut, within the framework of BOUT++ boundary plasma turbulence code [Z. H. Wang et al., Nucl. Fusion 54, 043019 (2014)]. The physical model includes plasma density, heat and momentum transport equations along with neutral density, and momentum transport equations. Transport dynamics and profile evolutions of both plasma and neutrals are simulated and compared between GP and SMBI in both poloidal and radial directions, which are quite different from one and the other. It finds that the neutrals can penetrate about four centimeters inside the last closed (magnetic) flux surface during SMBI, while they are all deposited outside of the LCF during GP. It is the radial convection and larger inflowing flux which lead to the deeper penetration depth of SMBI and higher fueling efficiency compared to GP.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ; ;  [5] ;  [1] ;  [2]
  1. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610041 (China)
  2. (China)
  3. Southwestern Institute of Physics, Chengdu 610041 (China)
  4. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
  5. School of Physics and Chemistry, Xihua University, Chengdu 610041 (China)
Publication Date:
OSTI Identifier:
22407999
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BEAM INJECTION; CONVECTION; DIVERTORS; GEOMETRY; HL-2A TOKAMAK; MAGNETIC FLUX; MOLECULAR BEAMS; PENETRATION DEPTH; PLASMA DENSITY; SIMULATION; TRANSPORT THEORY; TURBULENCE; TWO-DIMENSIONAL CALCULATIONS