| Original Articles |
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A New Regime for Studying the High Bootstrap Current Fraction
Plasma |
| X. Gao1,2;A. Isayama1;Y. Kamada1;K. Ushigusa1;T. Fujita1; T. Suzuki1 |
| 1Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, Naka-machi, Naka-gun, Ibaraki-ken 311-01, Japan
2Institute of Plasma Physics, Chinese Academy of Sciences, P.O.Box 1126, Hefei 230031 |
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| Cite this article: |
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X. Gao, A. Isayama, Y. Kamada et al 2001 Chin. Phys. Lett. 18 931-932 |
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Abstract A new experimental regime has recently been studied for achieving high fraction of the bootstrap current in the JT-60U hydrogen discharges. The high poloidal beta (βp ～ 3.61) plasma was obtained by high-power neutral beam injection heating at very high edge safety factor (Ip = 0.3 MA, Bt = 3.65 T, qeff = 25 - 35) region, and the bootstrap current fraction (fBS) was about 40% using the ACCOME code calculation. It was observed that there were no magnetohydrodynamics instabilities to retard the increase of βp and fBS parameters in the new regime.
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| Keywords:
52.35.Py
52.55.Fa
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Published: 01 July 2001
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| PACS: |
52.35.Py
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(Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.))
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52.55.Fa
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(Tokamaks, spherical tokamaks)
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