Plasma position control in SST1 tokamak |
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Authors: | I Bandyopadhyay S P Deshpande |
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Institution: | (1) Institute for Plasma Research, 382 428 Bhat, Gandhinagar, India |
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Abstract: | For long duration steady state operation of SST1, it would be very crucial to maintain the plasma radial and vertical positions
accurately. For designing the position controller in SST1 we have adopted the simple linear RZIP control model. While the
vertical position instability is slowed down by a set of passive stabilizers placed closed to the plasma edge, a pair of in-vessel
active feedback coils can adequately control vertical position perturbations of up to 1 cm. The shifts in radial position
arising due to minor disruptions would be controlled by a separate pair of poloidal field (PF) coils also placed inside the
vessel, however the controller would ignore fast but insignificant changes in radius arising due to edge localised modes.
The parameters of both vertical and radial position control coils and their power supplies are determined based on the RZIP
simulations. |
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Keywords: | Plasma position control vertical instability radial perturbations |
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