Ion temperature and toroidal rotation in JET ’s low torque plasmas

This paper reports on the procedure developed as the best method to provide an accurate and reliable estimation of the iontemperature Ti and the toroidal velocity vϕ fromCharge-eXchange Recombination Spectroscopy(CXRS) data from intrinsic rotation experiments at the Joint European Torus with thecarbon wall. The low impurity content observed in suchplasmas, resulting in low activeCXRS signal, alongside lowDoppler shifts makes the determination of Ti and vϕ particularly difficult. The beam modulation method will be discussed along with themeasures taken to increase photon statistics and minimise errors from the absolutecalibration and magneto-hydro-dynamics effects that may impact theCXRS passive emission.

Source: Review of Scientific Instruments - October 17, 2016 Category: Physics Authors: J. Bernardo, M. F. F. Nave, C. Giroud, S. Reyes Cortes, Jo ão P. S. Bizarro and JET Contributors Source Type: research