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Title: DiMES PMI research at DIII-D in support of ITER and beyond

An overview of recent Plasma-Material Interactions (PMI) research at the DIII-D tokamak using the Divertor Material Evaluation System (DiMES) is presented. The DiMES manipulator allows for exposure of material samples in the lower divertor of DIII-D under well-diagnosed ITER-relevant plasma conditions. Plasma parameters during the exposures are characterized by an extensive diagnostic suite including a number of spectroscopic diagnostics, Langmuir probes, IR imaging, and Divertor Thomson Scattering. Post-mortem measurements of net erosion/deposition on the samples are done by Ion Beam Analysis, and results are modelled by the ERO and REDEP/WBC codes with plasma background reproduced by OEDGE/DIVIMP modelling based on experimental inputs. This article highlights experiments studying sputtering erosion, re-deposition and migration of high-Z elements, mostly tungsten and molybdenum, as well as some alternative materials. Results are generally encouraging for use of high-Z PFCs in ITER and beyond, showing high redeposition and reduced net sputter erosion. Two methods of high-Z PFC surface erosion control, with (i) external electrical biasing and (ii) local gas injection, are also discussed. Furthermore, these techniques may find applications in the future devices.
 [1] ;  [2] ;  [3] ;  [2] ;  [4] ;  [5] ;  [1] ;  [6] ;  [7] ;  [8] ;  [1] ;  [2] ;  [1] ;  [9] ;  [4] ;  [10] ;  [3] ;  [11] ;  [1] ;  [10] more »;  [2] ;  [10] ;  [1] ;  [8] ;  [2] ;  [6] ;  [8] ;  [2] « less
  1. Univ. of California, San Diego, La Jolla, CA (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Oak Ridge Associated Univ., Oak Ridge, TN (United States)
  4. Univ. of Toronto Institute for Aerospace Studies, Toronto (Canada)
  5. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  7. Purdue Univ., West Lafayette, IN (United States)
  8. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  9. Univ. of Tennessee, Knoxville, TN (United States)
  10. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  11. Univ. of Wisconsin, Madison, WI (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Fusion Engineering and Design
Additional Journal Information:
Journal Volume: 124; Journal ID: ISSN 0920-3796
Research Org:
General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DIII-D tokamak; DiMES; Plasma-facing components; Plasma-material interactions
OSTI Identifier: