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(EX/P3-11) Fluctuations and Stability of Plasmas in the H-1NF Heliac

J. H. Harris¹⁾, M.G. Shats¹⁾, B.D. Blackwell¹⁾, W.M. Solomon¹⁾, D.G. Pretty¹⁾, S.M. Collis¹⁾, F. Glass¹⁾, J. Howard¹⁾, X. Hua¹⁾, C.A. Michael¹⁾, H. Punzmann^1)
 
1) Australian National University, Canberra, Australia

Abstract.  The H-1NF heliac is a medium-sized heliac stellarator experiment with major radius R = 1 m, average plasma minor radius a = 0.15 - 0.2 m. Its ``flexible-heliac'' coil set permits extraordinary variation in the rotational transform profile and magnetic well. Experiments in low-field (B < 0.2 T) argon plasmas heated by helicon waves have yielded fundamental results on turbulent transport and confinement transitions, in particular concerning non-ambipolar flows, electric fields, and zonal flows. At higher field (0.5 T), the device can be operated with precise (to within less than 1%) control of the rotational transform profile. Configuration scans with H-He plasmas heated by up to 100 kW of ICRF show resonance phenomena in confinement that correlate with changes in the characteristics of coherent magnetic field fluctuations.

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