First observation of ELM pacing with vertical jogs in a spherical torus

S. P. Gerhardt, J. W. Ahn, J. M. Canik, R. Maingi, R. Bell, D. Gates, Robert James Goldston, R. Hawryluk, B. P. Le Blanc, J. Menard, A. C. Sontag, S. Sabbagh, K. Tritz

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Abstract

Experiments in a number of conventional aspect ratio tokamaks have been successful in pacing edge localized modes (ELMs) by rapid vertical jogging of the plasma. This paper demonstrates the first pacing of ELMs in a spherical torus plasma. Applied 30 Hz vertical jogs synchronized the ELMs with the upward motion of the plasma. 45 Hz jogs also lead to an increase in the ELM frequency, though the synchronization of the ELMs and jogs was unclear. A reduction in the ELM energy was observed at the higher driven ELM frequencies.

Original languageEnglish (US)
Article number064015
JournalNuclear Fusion
Volume50
Issue number6
DOIs
StatePublished - Jun 7 2010

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Gerhardt, S. P., Ahn, J. W., Canik, J. M., Maingi, R., Bell, R., Gates, D., Goldston, R. J., Hawryluk, R., Le Blanc, B. P., Menard, J., Sontag, A. C., Sabbagh, S., & Tritz, K. (2010). First observation of ELM pacing with vertical jogs in a spherical torus. Nuclear Fusion, 50(6), [064015]. https://doi.org/10.1088/0029-5515/50/6/064015