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oai:docta.ucm.es:20.500.14352/519012023-08-26T11:48:02Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Castejón, F. author Fernández Pérez, Luis Antonio author Martín Mayor, Víctor author Tarancón, A. author Velasco, J. L. author CX group, . author 2008-01 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. 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 Ion heating in transitions to CERC in the stellarator TJ-II