Abstract
Lower hybrid waves propagating both parallel and anti-parallel to the toroidal field (bidirectional waves) produce suprathermal electron tails in both directions. The contribution of these tails is additive for the pressure but subtractive for the plasma current Ip. Therefore, the poloidal beta due to tail electrons, ßptai1, becomes much larger than that in the usual case of unidirectional current drive, where ßptai1 exceeds unity only when Ip is smaller than the Alfvèn critical current IA. In the WT-3 tokamak, lower hybrid current drive plasmas produced by bidirectional and unidirectional injection have been compared in terms of ßp. The experimental results show that a high ßp plasma is generated with Ip larger than IA in the bidirectional case.
| Original language | English |
|---|---|
| Pages (from-to) | 1394-1398 |
| Number of pages | 5 |
| Journal | Nuclear Fusion |
| Volume | 31 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - Jan 1 1991 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Condensed Matter Physics
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Production of high poloidal beta plasma by bidirectional lower hybrid current drive in the wt-3 tokamak. / Maekawa, T.; Iida, M.; Tanaka, H.; Ide, S.; Hanada, K.; Minami, T.; Fukino, T.; Terumichi, Y.; Tanaka, S.
In: Nuclear Fusion, Vol. 31, No. 7, 01.01.1991, p. 1394-1398.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Production of high poloidal beta plasma by bidirectional lower hybrid current drive in the wt-3 tokamak
AU - Maekawa, T.
AU - Iida, M.
AU - Tanaka, H.
AU - Ide, S.
AU - Hanada, K.
AU - Minami, T.
AU - Fukino, T.
AU - Terumichi, Y.
AU - Tanaka, S.
PY - 1991/1/1
Y1 - 1991/1/1
N2 - Lower hybrid waves propagating both parallel and anti-parallel to the toroidal field (bidirectional waves) produce suprathermal electron tails in both directions. The contribution of these tails is additive for the pressure but subtractive for the plasma current Ip. Therefore, the poloidal beta due to tail electrons, ßptai1, becomes much larger than that in the usual case of unidirectional current drive, where ßptai1 exceeds unity only when Ip is smaller than the Alfvèn critical current IA. In the WT-3 tokamak, lower hybrid current drive plasmas produced by bidirectional and unidirectional injection have been compared in terms of ßp. The experimental results show that a high ßp plasma is generated with Ip larger than IA in the bidirectional case.
AB - Lower hybrid waves propagating both parallel and anti-parallel to the toroidal field (bidirectional waves) produce suprathermal electron tails in both directions. The contribution of these tails is additive for the pressure but subtractive for the plasma current Ip. Therefore, the poloidal beta due to tail electrons, ßptai1, becomes much larger than that in the usual case of unidirectional current drive, where ßptai1 exceeds unity only when Ip is smaller than the Alfvèn critical current IA. In the WT-3 tokamak, lower hybrid current drive plasmas produced by bidirectional and unidirectional injection have been compared in terms of ßp. The experimental results show that a high ßp plasma is generated with Ip larger than IA in the bidirectional case.
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U2 - 10.1088/0029-5515/31/7/016
DO - 10.1088/0029-5515/31/7/016
M3 - Article
AN - SCOPUS:0026187296
VL - 31
SP - 1394
EP - 1398
JO - Nuclear Fusion
JF - Nuclear Fusion
SN - 0029-5515
IS - 7
ER -