ELM Suppression in Low Edge Collisionality H-Mode Discharges Using n=3 Magnetic Perturbations

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Using resonant magnetic perturbations with toroidal mode number n = 3, we have produced H-mode discharges without edge localized modes (ELMs) which run with constant density and radiated power for periods up to about 2550 ms (17 energy confinement times). These ELM suppression results are achieved at pedestal collisionalities close to those desired for next step burning plasma experiments such as ITER and provide a means of eliminating the rapid erosion of divertor components in such machines which could be caused by giant ELMs. The ELM suppression is due to an enhancement in the edge particle transport which reduces the ... continued below

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PDF-file: 46 pages; size: 2.8 Mbytes

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Burrell, K H; Evans, T E; Doyle, E J; Fenstermacher, M E; Groebner, R J; Leonard, A W et al. July 11, 2005.

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Using resonant magnetic perturbations with toroidal mode number n = 3, we have produced H-mode discharges without edge localized modes (ELMs) which run with constant density and radiated power for periods up to about 2550 ms (17 energy confinement times). These ELM suppression results are achieved at pedestal collisionalities close to those desired for next step burning plasma experiments such as ITER and provide a means of eliminating the rapid erosion of divertor components in such machines which could be caused by giant ELMs. The ELM suppression is due to an enhancement in the edge particle transport which reduces the edge pressure gradient and pedestal current density below the threshold for peeling-ballooning modes. These n = 3 magnetic perturbations provide a means of active control of edge plasma transport.

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PDF-file: 46 pages; size: 2.8 Mbytes

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  • Journal Name: Plasma Physics and Controlled Fusion, vol. 47, no. 12B, December 1, 2005, B37-B52; Journal Volume: 47; Journal Issue: 12B

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  • Report No.: UCRL-JRNL-213550
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 940143
  • Archival Resource Key: ark:/67531/metadc902877

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  • July 11, 2005

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 23, 2016, 6:15 p.m.

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Burrell, K H; Evans, T E; Doyle, E J; Fenstermacher, M E; Groebner, R J; Leonard, A W et al. ELM Suppression in Low Edge Collisionality H-Mode Discharges Using n=3 Magnetic Perturbations, article, July 11, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc902877/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.