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The motional Stark effect is used in several fusion devices to gain information about the internal magnetic field structure, in particular the q-profile. This technique has also been applied on JET, both as polarimetric (B direction) and spectroscopic (total B) measurements. This study explores the particular difficulties that would be encountered in JET and assesses the likely performance of such a diagnostic device. The conclusion is that, although difficult, such a diagnostic is feasible and would provide fast (< 10 ms), high resolution (< 5 cm), measurements of the projected magnetic pitch angle as input for EFIT.

Additional information

Authors: HAWKES N C, JET Joint Undertaking, Abingdon, Oxon (GB)
Bibliographic Reference: Report: JET-R(96)10 EN (1996) 38pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
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