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Title: High-Z material erosion and its control in DIII-D carbon divertor

It is expected that high-Z materials will be used as plasma-facing components (PFCs) in future fusion devices, making the erosion of high-Z material a key issue for high-power, long pulse operation. High-Z material erosion and redeposition have been studied using tungsten and molybdenum coated samples exposed in well-diagnosed DIII-D divertor plasma discharges. By coupling dedicated experiments and modelling using the 3D Monte Carlo code ERO, the roles of sheath potential and background carbon impurities in determining high-Z material erosion are identified. Different methods suggested by modelling have been investigated to control high-Z material erosion in DIII-D experiments. The erosion of Mo and W are found to be strongly suppressed by local injection of methane and deuterium gases. The 13C deposition resulting from local 13CH 4 injection also provides information on radial transport due to E×B drifts and cross field diffusion. Finally, D 2 gas puffing is found to cause 2 local plasma perturbation, suppressing W erosion because of the lower effective sputtering yield of W at lower plasma temperature and for higher carbon concentration in the mixed surface layer.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [2] ;  [8] ;  [8] ;  [9] ;  [8] ;  [5] ;  [6] ;  [10] ;  [8] ;  [10] ;  [10] ;  [8] ;  [8] more »;  [11] ;  [7] ;  [5] ;  [4] « less
  1. Oak Ridge Associated Univ., Oak Ridge, TN (United States); Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Plasma Physics
  2. Univ. of California, San Diego, CA (United States)
  3. Univ. of Toronto, ON (Canada). Canadian Inst. for Aerospace Studies
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  5. Oak Ridge Associated Univ., Oak Ridge, TN (United States)
  6. Forschungszentrum Julich (Germany). Inst. for Energy and Climate Research (IEK), Plasma Physics
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  8. General Atomics, San Diego, CA (United States)
  9. Univ. of Toronto, ON (Canada). Canadian Inst. for Aerospace Studies
  10. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  11. Technische Univ. Wien, Vienna (Austria). Fusion@OAW, Inst. of Applied Physics; Univ. of Innsbruck (Austria). Inst. for Theoretical Physics
Publication Date:
Grant/Contract Number:
FC02-04ER54698; SC0008698; AC05-06OR23100; FG02-07ER54917; AC05-00OR22725; AC52007NA27344; AC04-94AL85000; 2013GB107004; 11375010; GZ769
Type:
Accepted Manuscript
Journal Name:
Nuclear Materials and Energy
Additional Journal Information:
Journal Volume: 12; Journal ID: ISSN 2352-1791
Publisher:
Elsevier
Research Org:
General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); National Magnetic Confinement Fusion Science Program of China; National Natural Science Foundation of China (NNSFC)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1374815