Magnetic well scan and confinement in the TJ-II sterllarator
| Autor: | F. Medina, Francisco Castejón, M. A. Ochando, I. Pastor, Boudewijn Ph. van Milligen, A. López-Fraguas, Eduardo de La Cal, M.A. Pedrosa, Adriana M. de Aguilera, E. Blanco, José Luis Velasco, Bing Liu, C. Hidalgo, E. Ascasíbar |
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| Rok vydání: | 2015 |
| Předmět: |
Physics
Nuclear and High Energy Physics Turbulence Boundary (topology) Plasma Condensed Matter Physics 01 natural sciences Stability (probability) 010305 fluids & plasmas law.invention Computational physics Nuclear magnetic resonance Position (vector) law 0103 physical sciences 010306 general physics Constant (mathematics) Stellarator |
| Zdroj: | Nuclear Fusion |
| ISSN: | 0029-5515 0032-1028 0741-3335 0748-1896 |
| DOI: | 10.1088/0029-5515/55/11/113014 |
| Popis: | The magnetic well is the main stabilising mechanism in the TJ-II stellarator, since this is an almost shearless device. TJ-II has the capability of varying its magnetic configuration by changing the currents of its coils, allowing one to change the magnetic well while keeping the vacuum rotational transform profile almost constant, in particular. This characteristic makes this stellarator a suitable device to study the impact of unfavourable magnetic well conditions on plasma performance and stability. The here reported experiments explored a family of ten magnetic configurations with a similar rotational transform and varying magnetic well, from positive to negative values, hence exploring Mercier-unstable configurations. We succeeded in developing reproducible NBI-heated plasmas, even when the most Mercier-unstable configurations were performed, although the turbulence level was higher in the latter configurations. The position of the plasma boundary agreed with the equilibrium calculations in all cases. |
| Databáze: | OpenAIRE |
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