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Session 6P - TEXT-U, Tore Supra, HBT-EP, and Other Tokamaks.
POSTER session, Wednesday afternoon, November 13
Exhibit Hall - Concourse Level, Adam's Mark

[6P.30] Analysis of Feedback Experiments for the Control of Rotating Resistive Modes in HBT-EP

M.K. Vijaya Sankar, E. Eisner, A. Garofalo, T.H. Ivers, R. Kombargi, M.E. Mauel, D. Maurer, D. Nadle, G.A. Navratil, A. Sainz, E. Taylor, Q. Xiao (Columbia University), W.A. Reass, G.A. Wurden (Los Alamos National Laboratory)

Investigation of the effect of a combination of close-fitting, adjustable conducting shell and magnetic feedback on MHD instabilities has been carried out in the HBT-EP tokamak. Simulation of the response of the feedback coils for the control of rotating resistive modes has been done by solving the dynamical equations^1 describing the nonlinear evolution of the tearing mode island width and frequency of rotation in 1D. A high-power amplifier is used to power a set of five discrete saddle coils to produce the external n=1, m=2 helical field. The amplitude and phase of the n=1, m=2 fluctuations are measured using a set of m=2 Fourier analyzing Rogowski coils. The results from the simulation are compared with those from the experiment.

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\$^*\,Supported by U. S. DOE Grant No. DE-FG02-86ER53222 \$^1\,E. Lazzaro and M. F. F. Nave, Phys. Fluids 31,1623 (1988)

Part 6 of program listing