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(EX/P2-02) Reversed-field Pinch Experiments in EXTRAP T2R with a Resistive Shell Boundary

J.R. Drake¹⁾, J.-A. Malmberg¹, M. Cecconello¹, P.R. Brunsell¹, D. Yadikin^1
 
1) Alfvén Laboratory, KTH, Stockholm, Sweden

Abstract.  The EXTRAP T2R reversed-field pinch is operated with a resistive shell with a magnetic penetration time of 6 ms. This time is intermediate between the dynamo/relaxation cycle time scale (<2 ms) and the pulse length (=20 ms). The resonant tearing modes do not wall-lock. They exhibit natural rotation with angular phase velocities in the range of 20 to 600 krad/s. With these conditions, the radial component of the perturbation at the shell from the resonant mode is suppressed. The linear growth rates of the unstable, non-resonant (resistive-wall) kink modes have been measured. The measured growth rates follow the trend expected from theoretical estimates for a range of equilibria. Furthermore, when the resonant modes are rotating, the loop voltage and confinement parameters have values comparable to those of a conducting-shell RFP. The poloidal beta is around 10% for a range of current and density.

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