High βp plasma formation using off-axis ECCD in Ohmic heated plasma in the spherical tokamak QUEST

QUEST Team

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

High poloidal beta (εβp ~ 1) operation in steady state condition in tokamaks is of great interest and has previously been demonstrated using NBI, LHCD and low current (Ip) plasma for a short time (<0.5 s). A very few experiments however, have been performed towards the investigation of highest obtainable βp in tokamak plasma. In this work we report the first result of high βp production and its sustainment though an off axis ECCD at two different frequencies (fundamental and second harmonic) in Ohmic (OH) target plasma. With application of ECCD, plasma βp increased to encounter an equilibrium limit and the standard limiter configuration is transformed to an Inboard Poloidal field Null (IPN) configuration. Both off-axis and on-axis ECCD is studied and found to have some distinctive features, which are discussed in this paper.

Original languageEnglish
Article number02012
JournalEPJ Web of Conferences
Volume87
DOIs
Publication statusPublished - Mar 12 2015
Event18th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC 2014 - Nara, Japan
Duration: Apr 22 2014Apr 25 2014

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low currents
configurations
encounters
harmonics

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

High βp plasma formation using off-axis ECCD in Ohmic heated plasma in the spherical tokamak QUEST. / QUEST Team.

In: EPJ Web of Conferences, Vol. 87, 02012, 12.03.2015.

Research output: Contribution to journalConference article

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abstract = "High poloidal beta (εβp ~ 1) operation in steady state condition in tokamaks is of great interest and has previously been demonstrated using NBI, LHCD and low current (Ip) plasma for a short time (<0.5 s). A very few experiments however, have been performed towards the investigation of highest obtainable βp in tokamak plasma. In this work we report the first result of high βp production and its sustainment though an off axis ECCD at two different frequencies (fundamental and second harmonic) in Ohmic (OH) target plasma. With application of ECCD, plasma βp increased to encounter an equilibrium limit and the standard limiter configuration is transformed to an Inboard Poloidal field Null (IPN) configuration. Both off-axis and on-axis ECCD is studied and found to have some distinctive features, which are discussed in this paper.",
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AU - Zushi, H.

AU - Idei, Hiroshi

AU - Hasegawa, Makoto

AU - Hanada, Kazuaki

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