Effect of divertor geometry on plasma detachment in DIII-D

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This paper explores the physics of the recently installed Radiative Divertor Plasma divertor (RDP) in DIII-D through the use of UEDGE simulation with experimentally derived plasma parameters. The RDP is a nearly closed baffle and cryopumping system in the upper divertor of DIII-D. [l] One measure of the effectiveness of the RDP is the achievement of a detached plasma with a lower core density than in the open divertor (present in the lower divertor in DIII-D). Plasma detachment, observed on all diverted tokamaks, is a change in the plasma state which results in a decrease in both the ion current ... continued below

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9 p.

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Wolf, N. S., Dickinson College, LLNL May 19, 1998.

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Description

This paper explores the physics of the recently installed Radiative Divertor Plasma divertor (RDP) in DIII-D through the use of UEDGE simulation with experimentally derived plasma parameters. The RDP is a nearly closed baffle and cryopumping system in the upper divertor of DIII-D. [l] One measure of the effectiveness of the RDP is the achievement of a detached plasma with a lower core density than in the open divertor (present in the lower divertor in DIII-D). Plasma detachment, observed on all diverted tokamaks, is a change in the plasma state which results in a decrease in both the ion current and heat load on the divertor plate. These reductions together with the related drop in electron temperature are important for divertor design in high power devices such as ITER, in which detached operation is assumed [2]. Both UEDGE modeling and DIII-D experiments show a reduction of 25% to 50% in the core density necessary for plasma detachment in the RDP compared to the open divertor.

Physical Description

9 p.

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OSTI as DE98058607

Other: FDE: PDF; PL:

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  • 13. international conference on plasma surface interactions, San Diego, CA (United States), 18-22 May 1998

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  • Other: DE98058607
  • Report No.: UCRL-JC--130753
  • Report No.: CONF-980560--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 292457
  • Archival Resource Key: ark:/67531/metadc686894

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  • May 19, 1998

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  • July 25, 2015, 2:20 a.m.

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  • April 6, 2017, 6:16 p.m.

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Wolf, N. S., Dickinson College, LLNL. Effect of divertor geometry on plasma detachment in DIII-D, article, May 19, 1998; California. (digital.library.unt.edu/ark:/67531/metadc686894/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.