Effects of particle fueling and plasma wall interactions on DIII-D discharges

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DIII-D has successfully operated with an all-graphite first wall, including the first observations of VH-mode without boronization. A major goal of this, and other recent upgrades, was to control impurity influxes and hydrogenic fueling. Graphite tiles were carefully pre-conditioned, first by ex situ preparation and then by baking and helium glow conditioning. No deuterium or hydrogen was used until tokamak operation commenced. With the all graphite wall, both impurity and deuterium influxes during tokamak discharges were lower than previous boronized discharges; central nickel impurity line radiation, NiXXV and NiXXVI, was an order of magnitude lower than previous discharges during the ... continued below

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55 p.

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Jackson, G.L.; Baker, D.R.; Holtrop, K.L.; Staebler, G.M.; West, W.P.; Maingi, R. et al. November 1, 1994.

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  • General Atomic Company
    Publisher Info: General Atomics, San Diego, CA (United States)
    Place of Publication: San Diego, California

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Description

DIII-D has successfully operated with an all-graphite first wall, including the first observations of VH-mode without boronization. A major goal of this, and other recent upgrades, was to control impurity influxes and hydrogenic fueling. Graphite tiles were carefully pre-conditioned, first by ex situ preparation and then by baking and helium glow conditioning. No deuterium or hydrogen was used until tokamak operation commenced. With the all graphite wall, both impurity and deuterium influxes during tokamak discharges were lower than previous boronized discharges; central nickel impurity line radiation, NiXXV and NiXXVI, was an order of magnitude lower than previous discharges during the ELM free beam heated phase. The effect of reduced particle fueling on plasma performance, particularly H- and VH-mode discharges, will be presented.

Physical Description

55 p.

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INIS; OSTI as DE95009608

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  • 11. international conference on plasma surface interactions in controlled fusion devices, Mito (Japan), 23-27 May 1994

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  • Other: DE95009608
  • Report No.: GA-A--21716
  • Report No.: CONF-940580--26
  • Grant Number: AC03-89ER51114
  • Office of Scientific & Technical Information Report Number: 42488
  • Archival Resource Key: ark:/67531/metadc679089

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  • November 1, 1994

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  • July 25, 2015, 2:20 a.m.

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  • April 18, 2016, 6 p.m.

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Jackson, G.L.; Baker, D.R.; Holtrop, K.L.; Staebler, G.M.; West, W.P.; Maingi, R. et al. Effects of particle fueling and plasma wall interactions on DIII-D discharges, article, November 1, 1994; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc679089/: accessed April 27, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.