High-Harmonic Fast Wave Driven H-mode Plasmas on NSTX

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The launch of High-Harmonic Fast Waves (HHFW) routinely provides auxiliary power to NSTX plasmas, where it is used to heat electrons and pursue drive current. H-mode transitions have been observed in deuterium discharges, where only HHFW and ohmic heating, and no neutral beam injection (NBI), were applied to the plasma. The usual H-mode signatures are observed. A drop of the Da light marks the start of a stored energy increase, which can double the energy content. These H-mode plasmas also have the expected kinetic profile signatures with steep edge density and electron temperature pedestal. Similar to its NBI driven counterpart--also ... continued below

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740 Kilobytes

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LeBlanc, B. P.; Bell, R. E.; Bernabei, S. I.; Indireshkumar, K.; Kaye, S. M.; Maingi, R. et al. May 2003.

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Description

The launch of High-Harmonic Fast Waves (HHFW) routinely provides auxiliary power to NSTX plasmas, where it is used to heat electrons and pursue drive current. H-mode transitions have been observed in deuterium discharges, where only HHFW and ohmic heating, and no neutral beam injection (NBI), were applied to the plasma. The usual H-mode signatures are observed. A drop of the Da light marks the start of a stored energy increase, which can double the energy content. These H-mode plasmas also have the expected kinetic profile signatures with steep edge density and electron temperature pedestal. Similar to its NBI driven counterpart--also observed on NSTX-- the HHFW H mode have density profiles that features ''ears'' in the peripheral region. These plasmas are likely candidates for long pulse operation because of the combination of bootstrap current, associated with H-mode kinetic profiles, and active current drive, which can be generated with HHFW power.

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740 Kilobytes

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  • Report No.: PPPL-3816
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/812904 | External Link
  • Office of Scientific & Technical Information Report Number: 812904
  • Archival Resource Key: ark:/67531/metadc733843

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  • May 2003

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • April 15, 2016, 8 p.m.

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LeBlanc, B. P.; Bell, R. E.; Bernabei, S. I.; Indireshkumar, K.; Kaye, S. M.; Maingi, R. et al. High-Harmonic Fast Wave Driven H-mode Plasmas on NSTX, report, May 2003; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc733843/: accessed November 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.