Characterization of energetic deuterium striking the divertor of the DIII-D tokamak

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Description

The flux and energy of particles striking the divertor during steady state operation and during disruptions are parameters of central interest in the design of power producing tokamaks. The energetic particle flux to the divertor is a critical factor, as it has a large effect on material behavior and the lifetime of plasma-facing components. Here, measurements of the deuterium particle flux and energy to the divertor of the DIII-D tokamak during a series of plasmas that terminated in disruptions have been made using a silicon collector probe installed on the divertor materials exposure system (DiMES). During the steady state portion ... continued below

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9 p.

Creation Information

Bastasz, R.; Wampler, W.R.; Whaley, J.A.; Whyte, D.G.; Parks, P.B.; Brooks, N.H. et al. June 1, 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

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Description

The flux and energy of particles striking the divertor during steady state operation and during disruptions are parameters of central interest in the design of power producing tokamaks. The energetic particle flux to the divertor is a critical factor, as it has a large effect on material behavior and the lifetime of plasma-facing components. Here, measurements of the deuterium particle flux and energy to the divertor of the DIII-D tokamak during a series of plasmas that terminated in disruptions have been made using a silicon collector probe installed on the divertor materials exposure system (DiMES). During the steady state portion of each discharge, the probe was located under the separatrix, but immediately before disrupting the plasma, by injecting either Ar or D{sub 2} gas, the strike point of the outer divertor leg was positioned over the probe. Comparison of the amount of retained D in the probe for the two types of disruptions indicates that much of the trapped D could have resulted from exposure in the private flux zone prior to the disruption. Measurements of the depth distribution of the trapped D in the Si imply that the incident ion energy was approximately 100 eV at normal incidence and decreased slightly at oblique angles. The measurements give an upper bound to the energy of deuterons striking the divertor floor in the vicinity of the strikepoint during disruptions.

Physical Description

9 p.

Notes

INIS; OSTI as DE96010525

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

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  • Other: DE96010525
  • Report No.: SAND--96-1284C
  • Report No.: CONF-960569--1
  • Grant Number: AC04-94AL85000;AC03-89ER51114
  • DOI: 10.2172/244619 | External Link
  • Office of Scientific & Technical Information Report Number: 244619
  • Archival Resource Key: ark:/67531/metadc668967

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • June 1, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Aug. 1, 2016, 6:52 p.m.

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Bastasz, R.; Wampler, W.R.; Whaley, J.A.; Whyte, D.G.; Parks, P.B.; Brooks, N.H. et al. Characterization of energetic deuterium striking the divertor of the DIII-D tokamak, report, June 1, 1996; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc668967/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.