Reproducible appearance of quasi single helicity state in a reversed field pinch with an appropriate control of the reversed toroidal field

Y. Hirano, R. Paccagnella, H. Koguchi, L. Frassinetti, H. Sakakita, S. Kiyama, Y. Yagi

Research output: Contribution to conferencePaper

Abstract

In the RFP experiment on TPE-RX, the QSH state can be obtained with an almost 100% reproducibility by using the very shallow reversal of Bta (keeping Bta almost zero). This QSH state with ordinary Θvalue (̃1.4-1.6) can be sustained for up to ̃45ms with slightly reduced reproducibility (̃85%) by applying the additional Bta reversal with delayed trigger (at ̃ 45-50ms with ̃ - (10-20) mT peak value). The QSH indicator Ns, as low as ̃1.2, is realized during this period. The onset mechanism of this QSH state is examined by the numerical calculation. The initially growing m/n=1/6 mode is linearly unstable to the ideal MHD instability. The 3-D simulation can also show the selective growth of this mode during the relaxation.
Original languageEnglish
Publication statusPublished - 2005
Externally publishedYes
Event32nd European Physical Society Conference on Plasma Physics and Controlled Fusion combined with the 8th International Workshop on Fast Ignition of Fusion Targets - , Spain
Duration: 1 Jan 2005 → …

Conference

Conference32nd European Physical Society Conference on Plasma Physics and Controlled Fusion combined with the 8th International Workshop on Fast Ignition of Fusion Targets
CountrySpain
Period1/1/05 → …

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All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

Hirano, Y., Paccagnella, R., Koguchi, H., Frassinetti, L., Sakakita, H., Kiyama, S., & Yagi, Y. (2005). Reproducible appearance of quasi single helicity state in a reversed field pinch with an appropriate control of the reversed toroidal field. Paper presented at 32nd European Physical Society Conference on Plasma Physics and Controlled Fusion combined with the 8th International Workshop on Fast Ignition of Fusion Targets, Spain.