Recent VH-mode results on DIII-D
- General Atomics, San Diego, CA (United States); and others
A regime of improved H-mode energy confinement, VH-mode, is obtained in the DIII-D tokamak with adequate vessel conditioning. The improved confinement in VH-mode is consistent with the extension of the region of high E {times} B velocity shear turbulence suppression zone further in from the plasma boundary. The energy confinement enhancement in VH-mode can be limited by ELMs, localized momentum transfer events, or operation at high heating power or low q. Energy confinement enhancement improves with increasing triangularity of the plasma cross section and is independent of elongation. The termination of VH-mode is associated with an edge localized kink mode which is destabilized by both the large edge pressure gradient and edge current density.
- Research Organization:
- General Atomics, San Diego, CA (United States); California Univ., Los Angeles, CA (United States); Lawrence Livermore National Lab., CA (United States); Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-89ER51114; FG03-86ER53225; W-7405-ENG-48; AC05-84OR21400
- OSTI ID:
- 10129223
- Report Number(s):
- GA-A--21554; CONF-9311147--5; ON: DE94007429; BR: 35AT10020/AT0520210; AT051013C/AT0520210
- Country of Publication:
- United States
- Language:
- English
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VH-Mode discharges in the DIII-D tokamak
VH-Mode discharges in the DIII-D tokamak