Current ramp-up experiments in full current drive plasmas in TRIAM-1M
| Autor: | M. Sakamoto, E. Jotaki, Naoaki Yoshida, Hideharu Nakashima, S.V. Kulkarni, Osamu Mitarai, Katsumasa Nakamura, Makoto Hasegawa, Hideki Zushi, T. Fujiwara, Atsuhiro Iyomasa, S.-I. Itoh, Kazutoshi Tokunaga, Kazuaki Hanada, S. Kawasaki |
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| Rok vydání: | 2004 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Time constant Magnetic confinement fusion Plasma Condensed Matter Physics Lower hybrid oscillation Electron cyclotron resonance Computational physics Magnetic field Nuclear magnetic resonance Physics::Plasma Physics Electron temperature Current (fluid) |
| Zdroj: | Nuclear Fusion. 44:357-361 |
| ISSN: | 1741-4326 0029-5515 |
| DOI: | 10.1088/0029-5515/44/2/019 |
| Popis: | Four types of plasma current ramp-up experiments in full non-inductively lower hybrid current driven (LHCD) plasmas were executed in TRIAM-1M: (1) current start-up by a combination of electron cyclotron resonance heating (ECRH) and LHCD, (2) tail heating by additional LHCD, (3) bulk heating by ECRH and (4) spontaneous ramp-up by a transition to enhanced current drive (ECD) mode. The time evolutions of plasma current during four types of ramp-up phase were adjusted by a simple model with two different time constants, which are a time defined by the total current diffusion time and a time constant for improving the current drive efficiency. In the case of (1) and (4), the latter time constant is significant during the current ramp-up phase. The improvement in the current drive efficiency in the ECD mode is likely to be caused by the increase in the effective refractive index along the magnetic field of the lower hybrid wave. |
| Databáze: | OpenAIRE |
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