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Title: Numerical investigation on lithium transport in the edge plasma of EAST real-time- Li-injection experiments in the frame of BOUT++

Journal Article · · Nuclear Materials and Energy
 [1];  [1];  [2];  [3];  [4];  [4];  [4];  [1]
  1. Dalian Univ. of Technology, Dalian (China). School of Physics and Opto-Electronic Engineering
  2. Southwestern Inst. of Physics, Chengdu (China)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics
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To study the transport of Li species in the plasma with real-time Li aerosol injection on EAST, a model has been developed by reducing Braginskii's equations, and implemented in the frame of BOUT++. The simulation results show that Li atoms propagate inwards since the Li injection, and their penetration depth depends on both the local plasma conditions along their path and initial injection velocity. It is also found that Li ions accumulate rapidly in the edge, and only a small fraction of Li species can transport cross the separatrix into the core. In the poloidal direction, Li ions drift swiftly downwards along the field lines, and transport much faster at the high field side than at the low field side. The interaction between background plasma and Li species plays a critical role in determining the edge plasma profile. It is found that real-time Li injection raises the plasma density in the pedestal region and reduces the plasma temperature, just as has been observed experimentally.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1568006
Report Number(s):
LLNL-JRNL-789247; 987489; TRN: US2100003
Journal Information:
Nuclear Materials and Energy, Vol. 12, Issue C; ISSN 2352-1791
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

References (12)

Conference Report on the 2nd International Symposium on Lithium Applications for Fusion Devices journal February 2012
New Steady-State Quiescent High-Confinement Plasma in an Experimental Advanced Superconducting Tokamak journal February 2015
Dependence of recycling and edge profiles on lithium evaporation in high triangularity, high performance NSTX H-mode discharges journal August 2015
Influence of lithium coatings with large-area coverage on EAST plasma performance journal December 2014
First results of lithium experiments on EAST and HT-7 journal August 2011
Lithium coating for H-mode and high performance plasmas on EAST in ASIPP journal July 2013
An overview of lithium experiments on HT-7 and EAST during 2012 journal December 2014
Status and verification of edge plasma turbulence code BOUT journal June 2009
BOUT++: A framework for parallel plasma fluid simulations journal September 2009
Drift-ordered fluid equations for field-aligned modes in low-β collisional plasma with equilibrium pressure pedestals journal December 2003
2D simulations of transport dynamics during tokamak fuelling by supersonic molecular beam injection journal March 2014
The relationships between edge localized modes suppression, pedestal profiles and lithium wall coatings in NSTX journal September 2011

Figures / Tables (7)

Fig. 1(p. 6)figure Fig. 1
Fig. 2(p. 7)figure Fig. 2
Fig. 3(p. 8)figure Fig. 3
Fig. 4(p. 9)figure Fig. 4
Fig. 5(p. 9)figure Fig. 5
Fig. 6(p. 10)figure Fig. 6
Fig. 7(p. 10)figure Fig. 7

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BOUT++
Lithium injection
Edge plasma