Measurements accounting for the impediment of ion spin-up in rotating magnetic field driven field reversed configurations

Deards, C. L.; Hoffman, A. L.; Steinhauer, L. C.
November 2011
Physics of Plasmas;Nov2011, Vol. 18 Issue 11, p112511
Academic Journal
Improved vacuum hygiene, wall conditioning, and reduced recycling in the rotating magnetic field (RMF) driven translation, confinement, and sustainment-upgrade (TCSU) field reversed configuration experiment have made possible a more accurate assessment of the forces affecting ion spin-up. This issue is critical in plasmas sustained by RMFs, such as TCSU since ion spin-up can substantially reduce or cancel the RMF current drive effect. Several diagnostics are brought to bear, including a 3-axis translatable magnetic probe allowing the first experimental measurement of the end shorting effect. These results show that the ion rotation is determined by a balance between electron-ion friction, the end shorting effect, and ion drag against neutrals.


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