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In the advanced stellarator W7-AS, active charge exchange recombination spectroscopy (CXRS) is performed on intrinsic plasma impurities. Measurements are done on the doublet lines of the singly charged species of He II, B V, C VI, and N VII.
By spectral measurement of the CX Doppler line intensity, line shift, and line broadening, we evaluate the impurity density and rotation velocity profile and the impurity ion temperature. These parameters provide the transport relevant radial electric field and the ion temperature profile. The radial ion particle and heat transport together with the ambipolar electric field play a decisive role for the optimization of the 3-dimensional stellarator plasma.

Additional information

Authors: BALDZUHN J ET AL, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Article: Review of Scientific Instruments, Vol. 68, (1997) No. 1, pp. 1020-1023
Record Number: 199710697 / Last updated on: 1997-06-09
Original language: en
Available languages: en