Method for measuring radial impurity emission profiles using correlations of line integrated signals
2006 (English)In: Review of scientific instruments, ISSN 0034-6748, Vol. 77, no 4, 043508- p.Article in journal (Refereed) Published
A method of determining radial impurity emission profiles is outlined. The method uses correlations between line integrated signals and is based on the assumption of cylindrically symmetric fluctuations. Measurements at the reversed field pinch EXTRAP T2R show that emission from impurities expected to be close to the edge is clearly different in raw as well as analyzed data to impurities expected to be more central. Best fitting of experimental data to simulated correlation coefficients yields emission profiles that are remarkably close to emission profiles determined using more conventional techniques. The radial extension of the fluctuations is small enough for the method to be used and bandpass filtered signals indicate that fluctuations below 10 kHz are cylindrically symmetric. The novel method is not sensitive to vessel window attenuation or wall reflections and can therefore complement the standard methods in the impurity emission reconstruction procedure.
Place, publisher, year, edition, pages
2006. Vol. 77, no 4, 043508- p.
reversed-field pinch, density-fluctuations, transport, plasma, system
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:kth:diva-6557DOI: 10.1063/1.2195122ISI: 000237136500018ScopusID: 2-s2.0-33646428654OAI: oai:DiVA.org:kth-6557DiVA: diva2:11302
QC 201507272006-12-112006-12-112015-07-27Bibliographically approved