2026-07-03T13:30:36Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/519012023-08-26T11:48:02Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Castejón, F.
author
Fernández Pérez, Luis Antonio
author
Martín Mayor, Víctor
author
Tarancón, A.
author
Velasco, J. L.
author
CX group, .
2023-06-20T11:16:20Z
2023-06-20T11:16:20Z
2008-01
0029-5515
10.1088/0029-5515/48/6/065008
https://hdl.handle.net/20.500.14352/51901
http://doi.org/10.1088/0029-5515/48/6/065008
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.
eng
Ion heating in transitions to CERC in the stellarator TJ-II
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