38 citations · 143 across the 7 of their papers we have counts for
7 papers
Large tangential electric fields in plasmas close to temperature screening
J. L. Velasco, I. Calvo, J. M. García-Regaña +4
Low-collisionality stellarator plasmas usually display a large negative radial electric field that has been expected to cause accumulation of impurities due to their high charge nu…
Observation of oscillatory radial electric field relaxation in a helical plasma
J. A. Alonso, E. Sanchez, I. Calvo +13
Measurements of the relaxation of a zonal electrostatic potential perturbation in a non-axisymmetric magnetically confined plasma are presented. A sudden perturbation of the plasma…
Parallel impurity dynamics in the TJ-II stellarator
J A Alonso, J L Velasco, I Calvo +12
We review in a tutorial fashion some of the causes of impurity density variations along field lines and radial impurity transport in the moment approach framework. An explicit and…
Electrostatic potential variation on the flux surface and its impact on impurity transport
J. M. García-Regaña, C. D. Beidler, Y. Turkin +5
The particle transport of impurities in magnetically confined plasmas under some conditions does not find, neither quantitatively nor qualitatively, a satisfactory theory-based exp…
Electrostatic potential variations along flux surfaces in stellarators
M. A. Pedrosa, J. A. Alonso, J. M. García-Regaña +6
First observations of electrostatic potential variations within the flux surfaces of a toroidal magnetic confinement device are presented. Measurements are taken in the TJ-II stell…
Incompressibility of Impurity Flows in Low Density TJ-II Plasmas and Comparison with Neoclassical Theory
J Arévalo, J A Alonso, K J McCarthy +1
Poloidal and toroidal velocities of fully-ionised carbon are measured by means of charge exchange recombination spectroscopy (CXRS) in the TJ-II stellarator. We present a detailed…
Dynamic transport regulation by zonal flow-like structures in the TJ-II stellarator
J. A. Alonso, C. Hidalgo, M. A. Pedrosa +3
Floating potential structures that are correlated over a long distance are observed with a 2D probe array in the plasma edge of the TJ-II stellarator. We introduce a method based o…