Characterization of Fast Ion Absorption of the High Harmonic Fast Wave in the National Spherical Torus Experiment

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Ion absorption of the high harmonic fast wave in a spherical torus is of critical importance to assessing the viability of the wave as a means of heating and driving current. Analysis of recent National Spherical Torus Experiment (NSTX) shots has revealed that under some conditions when neutral beam and radio-frequency (RF) power are injected into the plasma simultaneously, a fast ion population with energy above the beam injection energy is sustained by the wave. In agreement with modeling, these experiments find the RF-induced fast ion tail strength and neutron rate at lower B-fields to be less enhanced, likely due ... continued below

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Rosenberg, A.L.; Menard, J.E.; Wilson, J.R.; Medle, S.; Phillips, C.K.; Andre, R. et al. August 19, 2003.

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Description

Ion absorption of the high harmonic fast wave in a spherical torus is of critical importance to assessing the viability of the wave as a means of heating and driving current. Analysis of recent National Spherical Torus Experiment (NSTX) shots has revealed that under some conditions when neutral beam and radio-frequency (RF) power are injected into the plasma simultaneously, a fast ion population with energy above the beam injection energy is sustained by the wave. In agreement with modeling, these experiments find the RF-induced fast ion tail strength and neutron rate at lower B-fields to be less enhanced, likely due to a larger beta profile, which promotes greater off-axis absorption where the fast ion population is small. Ion loss codes find the increased loss fraction with decreased B insufficient to account for the changes in tail strength, providing further evidence that this is an RF interaction effect. Though greater ion absorption is predicted with lower k(sub)||, surprisingly little variation in the tail was observed, along with a small neutron rate enhancement with higher k(sub)||. Data from the neutral particle analyzer, neutron detectors, X-ray crystal spectrometer, and Thomson scattering is presented, along with results from the TRANSP transport analysis code, ray-tracing codes HPRT and CURRAY, full-wave code and AORSA, quasi-linear code CQL3D, and ion loss codes EIGOL and CONBEAM.

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1.1 MB pages

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INIS; OSTI as DE00814742

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  • Other Information: PBD: 19 Aug 2003

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  • Report No.: PPPL-3854
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/814742 | External Link
  • Office of Scientific & Technical Information Report Number: 814742
  • Archival Resource Key: ark:/67531/metadc738387

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  • August 19, 2003

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 15, 2016, 8:32 p.m.

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Rosenberg, A.L.; Menard, J.E.; Wilson, J.R.; Medle, S.; Phillips, C.K.; Andre, R. et al. Characterization of Fast Ion Absorption of the High Harmonic Fast Wave in the National Spherical Torus Experiment, report, August 19, 2003; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc738387/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.