High-β plasma formation and observation of peaked density profile in RT-1

H. Saitoh; Z. Yoshida; J. Morikawa; Y. Yano; T. Mizushima; Y. Ogawa; M. Furukawa; Y. Kawai; K. Harima; Y. Kawazura; Y. Kaneko; K. Tadachi; S. Emoto; M. Kobayashi; T. Sugiura; G. Vogel

doi:10.1088/0029-5515/51/6/063034

High-β plasma formation and observation of peaked density profile in RT-1

H. Saitoh, Z. Yoshida, J. Morikawa, Y. Yano, T. Mizushima, Y. Ogawa, M. Furukawa, Y. Kawai, K. Harima, Y. Kawazura, Y. Kaneko, K. Tadachi, S. Emoto, M. Kobayashi, T. Sugiura, G. Vogel

FRIS - Core Interdisciplinary Research Section

The University of Tokyo

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

High-β ECH plasma is generated and stably sustained in a magnetospheric configuration, the Ring Trap 1 (RT-1) device, generated by a levitated dipole field magnet. Geomagnetic-field compensation and optimized operation have realized drastic improvements in plasma properties. The maximum local β value has reached 70% and the pressure profiles have a rather steep gradient near the superconducting magnet. Electrons of the high-β plasma typically consist of 70% hot (∼50 keV) and the rest of cold populations. Confinement time of the hot component plasma is 0.5 s with the optimized neutral gas pressure. By removing the coil support structure, the peaked density profile is observed in the strong field region.

Original language	English
Article number	063034
Journal	Nuclear Fusion
Volume	51
Issue number	6
DOIs	https://doi.org/10.1088/0029-5515/51/6/063034
Publication status	Published - 2011 Jun

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Saitoh, H., Yoshida, Z., Morikawa, J., Yano, Y., Mizushima, T., Ogawa, Y., Furukawa, M., Kawai, Y., Harima, K., Kawazura, Y., Kaneko, Y., Tadachi, K., Emoto, S., Kobayashi, M., Sugiura, T., & Vogel, G. (2011). High-β plasma formation and observation of peaked density profile in RT-1. Nuclear Fusion, 51(6), Article 063034. https://doi.org/10.1088/0029-5515/51/6/063034

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AU - Saitoh, H.

AU - Yoshida, Z.

AU - Morikawa, J.

AU - Yano, Y.

AU - Mizushima, T.

AU - Ogawa, Y.

AU - Furukawa, M.

AU - Kawai, Y.

AU - Harima, K.

AU - Kawazura, Y.

AU - Kaneko, Y.

AU - Tadachi, K.

AU - Emoto, S.

AU - Kobayashi, M.

AU - Sugiura, T.

AU - Vogel, G.

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AB - High-β ECH plasma is generated and stably sustained in a magnetospheric configuration, the Ring Trap 1 (RT-1) device, generated by a levitated dipole field magnet. Geomagnetic-field compensation and optimized operation have realized drastic improvements in plasma properties. The maximum local β value has reached 70% and the pressure profiles have a rather steep gradient near the superconducting magnet. Electrons of the high-β plasma typically consist of 70% hot (∼50 keV) and the rest of cold populations. Confinement time of the hot component plasma is 0.5 s with the optimized neutral gas pressure. By removing the coil support structure, the peaked density profile is observed in the strong field region.

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High-β plasma formation and observation of peaked density profile in RT-1

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