Impurity feedback control for enhanced divertor and edge radiation in DIII-D discharges

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Long pulse and steady state fusion ignition devices will require a significant radiated power fraction to minimize heat flux to, and sputtering of, the first wall. While impurity gases have been proposed to enhance radiation, precise control of impurity gas injection is essential to achieve an adequate radiative power fraction while maintaining good energy confinement and low central impurity concentration. We report here the first experiments in the DIII-D tokamak using feedback control of the rate of impurity gas injection. These experiments were carried out with active divertor pumping using the in-situ DIII-D cryopump. The radiated power fraction was controlled ... continued below

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15 p.

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Jackson, G.L.; Staebler, G.M. & Allen, S.L. October 1, 1996.

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Long pulse and steady state fusion ignition devices will require a significant radiated power fraction to minimize heat flux to, and sputtering of, the first wall. While impurity gases have been proposed to enhance radiation, precise control of impurity gas injection is essential to achieve an adequate radiative power fraction while maintaining good energy confinement and low central impurity concentration. We report here the first experiments in the DIII-D tokamak using feedback control of the rate of impurity gas injection. These experiments were carried out with active divertor pumping using the in-situ DIII-D cryopump. The radiated power fraction was controlled by sensing either UN edge line radiation (Ne{sup +7}) or mantle radiation from selected bolometer channels and using the DIII-D digital plasma control system to calculate radiated power real-time and generate an error signal to control an impurity gas injector valve.

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15 p.

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INIS; OSTI as DE97003363

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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: DE97003363
  • Report No.: GA--A22345
  • Report No.: CONF-960569--17
  • Grant Number: AC03-89ER51114;AC05-96OR22464;W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 459865
  • Archival Resource Key: ark:/67531/metadc675551

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Office of Scientific & Technical Information Technical Reports

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

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  • October 1, 1996

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  • July 25, 2015, 2:21 a.m.

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  • Aug. 1, 2016, 6:38 p.m.

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Jackson, G.L.; Staebler, G.M. & Allen, S.L. Impurity feedback control for enhanced divertor and edge radiation in DIII-D discharges, article, October 1, 1996; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc675551/: accessed May 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.