Calculations of Axisymmetric Stability of Tokamak Plasmas with Active and Passive Feedback

Details Calculations of Axisymmetric Stability of Tokamak Plasmas with Active and Passive Feedback Calculations of Axisymmetric Stability of Tokamak Plasmas with Active and Passive Feedback

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jcoph.104..221w&link_type=abstract

Journal of Computational Physics, Volume 104, Issue 1, p. 221-240.

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A new linear MHD stability code, NOVA-W, has been developed in order to study feedback stabilization of the axisymmetric mode in deformable tokamak plasmas. The NOVA-W code is a modification of the non-variational MHD stability code NOVA that includes the effects of resistive passive conductors and active feedback circuits. The vacuum calculation has been reformulated in terms of the perturbed poloidal flux to allow the inclusion of perturbed toroidal currents outside the plasma. The boundary condition at the plasma-vacuum interface relates the instability displacement to the perturbed poloidal flux. This allows a solution of the linear MHD stability equations with the feedback effects included. The passive stability predictions of the code have been tested both against a simplified analytic model and against a different numerical calculation for a realistic tokamak configuration. The comparisons demonstrate the accuracy of the NOVA-W results. Active feedback calculations are performed for the CIT tokamak design demonstrating the effect of varying the position of the flux loops that provide the measurements of vertical displacement. The results compare well with those computed earlier using a less efficient nonlinear code.

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