Measurements and modeling of transport and impurity radial profiles in the EXTRAP T2R reversed field pinch
2006 (English)In: Physics of Plasmas, ISSN 1070-664X, Vol. 13, no 9, 092506- p.Article in journal (Refereed) Published
Radial impurity profiles of oxygen in the rebuilt reversed field pinch EXTRAP T2R [P. R. Brunsell , Plasma Phys. Control. Fusion 43, 1457 (2001)] have been measured with a multichannel spectrometer. Absolute ion densities for oxygen peak between 1-4x10(10) cm(-3) for a central electron density of 1x10(13) cm(-3). Transport simulations with the one-dimensional transport code STRAHL with a diffusion coefficient of 20 m(2) s(-1) yield density profiles similar to those measured. Direct measurement of the ion profile evolution during pulsed poloidal current drive suggests that the diffusion coefficient is reduced by a factor similar to 2 in the core but remains unaffected toward the edge. Core transport is not significantly affected by the radial magnetic field growth seen at the edge in discharges without feedback control. This indicates that the mode core amplitude remains the same while the mode eigenfunction increases at the edge.
Place, publisher, year, edition, pages
2006. Vol. 13, no 9, 092506- p.
Carrier concentration; Diffusion; Eigenvalues and eigenfunctions; Feedback control; Magnetic fields; Radial flow; Spectrometers; Diffusion coefficients; Multichannel spectrometers; Radial impurity; Impurities
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-7661DOI: 10.1063/1.2349304ISI: 000240877800033ScopusID: 2-s2.0-33749334196OAI: oai:DiVA.org:kth-7661DiVA: diva2:12756
QC 20100810. Titel ändrad, tidigare titel: "Measurements and modelling of transport and impurity profiles in the EXTRAP T2R reversed field pinch" 20100810.2007-11-202007-11-202010-08-12Bibliographically approved