Impurity transport studies in RFX-mod multiple helicity and enhanced confinement QSH regimes
2010 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 52, no 9, 095001- p.Article in journal (Refereed) Published
The transport of intrinsic and artificially introduced impurities is investigated in the multiple helicity (MH) and quasi-single helicity (QSH) plasma regimes of the RFX-mod reversed-field pinch. Impurities are introduced through Ni laser blow-off and Ne gas puffing in both magnetic confinement scenarios. Simulation of experimental spectroscopic measurements, including line and soft x-ray emission, electron density and radiated power is carried out with a one-dimensional collisional-radiative model. For both QSH and MH an outwardly directed pinch velocity with a large barrier in the edge and no reversal is determined, accompanied by a diffusion coefficient that is an order of magnitude greater in the core than at the edge. The established transport parameters are similar for the Ni and Ne injected impurities with the transition region and barrier less external and stronger in the QSH regime.
Place, publisher, year, edition, pages
2010. Vol. 52, no 9, 095001- p.
reversed-field-pinch, transport, plasmas, impurities
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-50846DOI: 10.1088/0741-3335/52/9/095001ISI: 000280847300002OAI: oai:DiVA.org:kth-50846DiVA: diva2:466350
FunderSwedish Research Council
QC 201112162011-12-152011-12-082011-12-16Bibliographically approved