A kinetic model of retarding field analyser measurements in strongly magnetized, flowing, collisional plasmas

0421661 - ÚFP 2014 RIV GB eng J - Článek v odborném periodiku
Gunn, J. P. - Fuchs, Vladimír - Kočan, M.
A kinetic model of retarding field analyser measurements in strongly magnetized, flowing, collisional plasmas.
Plasma Physics and Controlled Fusion. Roč. 55, č. 4 (2013), 045012-045012. ISSN 0741-3335. E-ISSN 1361-6587
Grant CEP: GA MŠMT 7G10072
Institucionální podpora: RVO:61389021
Klíčová slova: plasma * collisions * magnetic field * retarding field analyzer
Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech
Impakt faktor: 2.386, rok: 2013
http://iopscience.iop.org/0741-3335/55/4/045012/pdf/0741-3335_55_4_045012.pdf

Interpretation of retarding field analyser (RFA) measurements in flowing tokamak scrape- off layer plasmas requires a model of the perturbation introduced by the wake, or presheath, of the instrument. We extend a collisionless kinetic Mach probe theory to include a simple model of ion-ion collisions. Collisions lead to significant modifications in the downstream presheath. Depending on the ion-to-electron temperature ratio, flow speed and collisionality, the measurement obtained by averaging the apparent temperatures on each side of a bi-directional RFA is predicted to overestimate the unperturbed ion temperature, but with errors not exceeding 50% most of the time. The error increases with Mach number, and decreases with the ion-to-electron temperature ratio.
Trvalý link: http://hdl.handle.net/11104/0227966