JET Radiative Mantle Experiments in ELMy H-Mode

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Radiative mantle experiments were performed on JET ELMy H-mode plasmas. The Septum configuration was used where the X-point is embedded into the top of the Septum. Argon radiated 50% of the input power from the bulk plasma while Z{sub eff} rose from an intrinsic level of 1.5 to about 1.7 due to the injected Argon. The total energy content and global energy confinement time decreased 15% when the impurities were introduced. In contrast, the effective thermal diffusivity in the core confinement region (r/a = .4--.8) decreased by 30%. Usually, JET ELMy H-mode plasmas have confinement that is correlated to the ... continued below

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18 p.

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Budny, R.; Coffey, I.; Dumortier, P.; Grisolia, C.; Strachan, J.D. & al, et September 28, 1999.

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Radiative mantle experiments were performed on JET ELMy H-mode plasmas. The Septum configuration was used where the X-point is embedded into the top of the Septum. Argon radiated 50% of the input power from the bulk plasma while Z{sub eff} rose from an intrinsic level of 1.5 to about 1.7 due to the injected Argon. The total energy content and global energy confinement time decreased 15% when the impurities were introduced. In contrast, the effective thermal diffusivity in the core confinement region (r/a = .4--.8) decreased by 30%. Usually, JET ELMy H-mode plasmas have confinement that is correlated to the edge pedestal pressure. The radiation lowered the edge pedestal and consequently lowered the global confinement. Thus the confinement was changed by a competition between the edge pedestal reduction lowering the confinement and the weaker RI effect upon the core transport coefficients raising the confinement. The ELM frequency increased from 10 Hz Type I ELMs, to 200 Hz type III ELMs. The energy lost by each ELM reduced to 0.5% of the plasma energy content.

Physical Description

18 p.

Notes

INIS; OSTI as DE00012131

Medium: P; Size: 18 pages

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  • 7th IAEA Technical Committee Meeting on H-Mode and Transport Barrier Physics, Oxford (GB), 09/27/1999--09/29/1999

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  • Report No.: Cfpaper-4057
  • Grant Number: AC02-76CH03073
  • Office of Scientific & Technical Information Report Number: 12131
  • Archival Resource Key: ark:/67531/metadc622168

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  • September 28, 1999

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  • June 16, 2015, 7:43 a.m.

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  • April 7, 2017, 4:08 p.m.

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Budny, R.; Coffey, I.; Dumortier, P.; Grisolia, C.; Strachan, J.D. & al, et. JET Radiative Mantle Experiments in ELMy H-Mode, article, September 28, 1999; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc622168/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.