Global Confinement, Sawtooth Mixing, and Stochastic Diffusion Ripple Loss of Fast ICRF-driven H+ Minority Ions in TFTR

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This paper presents studies of ICRF-driven H+ minority ions in TFTR (Tokamak Fusion Test Reator) deuterium plasmas using primarily passive Ho flux detection in the energy range of 0.2-1.0 MeV with some corroborating active (lithium pellet charge exchange) measurements. It is shown that in the passive mode the main donors for the neutralization of H+ ions in this energy range are C5+ ions. The measured effective H+ tail temperatures range from 0.15 MeV at an ICRF power of 2 MW to 0.35 MeV at 6 MW. Analysis of the ICRF-driven H+ ion energy balance has been performed on the basis ... continued below

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32 p.; Other: FDE: PDF; PL:

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Petrov, M.P.; Bell, R.; Budny, R.V.; Gorelenkov, N.N.; Medley, S.S. & Zweben, S.J., PPPL July 1, 1998.

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Description

This paper presents studies of ICRF-driven H+ minority ions in TFTR (Tokamak Fusion Test Reator) deuterium plasmas using primarily passive Ho flux detection in the energy range of 0.2-1.0 MeV with some corroborating active (lithium pellet charge exchange) measurements. It is shown that in the passive mode the main donors for the neutralization of H+ ions in this energy range are C5+ ions. The measured effective H+ tail temperatures range from 0.15 MeV at an ICRF power of 2 MW to 0.35 MeV at 6 MW. Analysis of the ICRF-driven H+ ion energy balance has been performed on the basis of the dependence of effective H+ temperatures on the plasma parameters. The analysis showed that H+ confinement times are comparable with their slowing-down times and tended to decrease with increasing ICRF power. Radial redistribution of ICRF-driven H+ ions was detected when giant sawtooth crashes occurred during the ICRF heating. The redistribution affected ions with energy below 0.7-0.8 MeV. The sawtooth crashes displace H+ ions outward along the plasma major radius into the stochastic ripple diffusion domain were those ions are lost in about 10 milliseconds. These observations are consistent with the model of the redistribution of energetic particles developed previously to explain the results of deuterium-tritium alpha-particle redistribution due to sawteeth observed in TFTR. The experimental data are also consistent with ORBIT code simulations of H+ stochastic ripple diffusion losses.

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32 p.; Other: FDE: PDF; PL:

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OSTI as DE98059562

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  • Other Information: PBD: Jul 1998

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  • Other: DE98059562
  • Report No.: PPPL--3309
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/289897 | External Link
  • Office of Scientific & Technical Information Report Number: 289897
  • Archival Resource Key: ark:/67531/metadc680618

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  • July 1, 1998

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  • July 25, 2015, 2:20 a.m.

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  • April 15, 2016, 5:32 p.m.

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Petrov, M.P.; Bell, R.; Budny, R.V.; Gorelenkov, N.N.; Medley, S.S. & Zweben, S.J., PPPL. Global Confinement, Sawtooth Mixing, and Stochastic Diffusion Ripple Loss of Fast ICRF-driven H+ Minority Ions in TFTR, report, July 1, 1998; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc680618/: accessed April 27, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.