DiMES divertor erosion experiments on DIII-D

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Description

The DiMES (Divertor Material Evaluation Studies) mechanism allows insertion of material samples to the lower divertor floor of the DIII-D tokamak. The main purpose of these studies is to measure erosion rates and redeposition mechanisms under tokamak divertor plasma conditions in order to obtain a physical understanding of the erosion/redeposition processes and to determine its implications for fusion power plant plasma facing components. Thin metal films of Be, W, V, and Mo, were deposited on a Si depth-marked graphite sample and exposed to the steady-state outer strike point on DIII-D. A variety of surface analysis techniques are used to determine ... continued below

Physical Description

18 p.

Creation Information

Whyte, D. G.; Brooks, J. N.; Wong, C. P. C.; West, W. P.; Bastasz, R.; Wampler, W. R. et al. June 1996.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico
  • General Atomic Company
    Publisher Info: General Atomics, San Diego, CA (United States)
    Place of Publication: San Diego, California
  • Argonne National Laboratory
    Publisher Info: Argonne National Lab., IL (United States)
    Place of Publication: Illinois

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Description

The DiMES (Divertor Material Evaluation Studies) mechanism allows insertion of material samples to the lower divertor floor of the DIII-D tokamak. The main purpose of these studies is to measure erosion rates and redeposition mechanisms under tokamak divertor plasma conditions in order to obtain a physical understanding of the erosion/redeposition processes and to determine its implications for fusion power plant plasma facing components. Thin metal films of Be, W, V, and Mo, were deposited on a Si depth-marked graphite sample and exposed to the steady-state outer strike point on DIII-D. A variety of surface analysis techniques are used to determine the erosion/redeposition of the metals and the carbon after 5--15 seconds of exposure. These short exposure times ensure controlled exposure conditions and the extensive array of DIII-D divertor diagnostics provide a well characterized plasma for modeling efforts. Erosion rates and redeposition lengths are found to decrease with the atomic number of the metallic species, as expected. Under these conditions, the peak net erosion rate for carbon is {approximately} 4 nm/s, with the erosion following the ion flux profile. Comparisons of the measured carbon erosion with REDEP code calculations show good agreement for both the absolute net erosion rate and its spatial variation. Measured erosion rates of the metals are smaller than predicted for sputtering from a bare metal surface, apparently due to effects of carbon deposition on the metal surface. Visible spectroscopic measurements of singly ionized Be have determined that the erosion process reaches steady-state during the exposure.

Physical Description

18 p.

Notes

INIS; OSTI as DE96010524

Source

  • 12. international conference on plasma surface interactions in controlled fusion devices, Saint-Raphael (France), 20-26 May 1996

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  • Other: DE96010524
  • Report No.: SAND--96-1281C
  • Report No.: GA--A22342;CONF-960569--2
  • Grant Number: AC04-94AL85000;AC03-89ER51114;W-31-109-ENG-38
  • DOI: 10.2172/244620 | External Link
  • Office of Scientific & Technical Information Report Number: 244620
  • Archival Resource Key: ark:/67531/metadc666671

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Creation Date

  • June 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

Description Last Updated

  • April 18, 2016, 3:55 p.m.

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Whyte, D. G.; Brooks, J. N.; Wong, C. P. C.; West, W. P.; Bastasz, R.; Wampler, W. R. et al. DiMES divertor erosion experiments on DIII-D, report, June 1996; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc666671/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.