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Ion heating in transitions to CERC in the stellarator TJ-II

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Castejón, F. and Fernández Pérez, Luis Antonio and Martín Mayor, Víctor and Tarancón, A. and Velasco, J. L. and CX group, . (2008) Ion heating in transitions to CERC in the stellarator TJ-II. Nuclear fusion, 48 (6). ISSN 0029-5515

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Official URL: http://doi.org/10.1088/0029-5515/48/6/065008



Abstract

In TJ-II stellarator plasmas, in the electron cyclotron heating regime, an increase in the ion temperature is observed, synchronized with that of the electron temperature, during the transition to the core electron-root confinement (CERC) regime. This rise in ion temperature should be attributed to the joint action of the electron–ion energy transfer (which changes slightly during the CERC formation) and an enhancement of the ion confinement. This improvement must be related to the increase in the positive electric field in the core region. In this paper, we confirm this hypothesis by estimating the ion collisional transport in TJ-II under the physical conditions established before and after the transition to CERC. We calculate a large number of ion orbits in the guiding-centre approximation considering the collisions with a background plasma composed of electrons and ions. The ion temperature profile and the thermal flux are calculated in a self-consistent way, so that the change in the ion heat transport can be assessed.


Item Type:Article
Additional Information:

© 2008 IAEA, Vienna. The authors acknowledge partial financial support from MEC (Spain), through research contract FIS2006-08533-C03, European Commission through contracts EGEE-II-031688 and int.eu.grid 031857 and from BSCH-UCM. J.L. Velasco is a DGA (Aragón, Spain) fellow.

Uncontrolled Keywords:Rational magnetic-surfaces; Neutral beam injection; Large helical device; ECRH plasmas; Transport barrier; Confinement; Core.
Subjects:Sciences > Physics
Sciences > Physics > Physics-Mathematical models
ID Code:37981
Deposited On:22 Jun 2016 10:37
Last Modified:09 Aug 2016 10:24

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