Demonstration of plasma startup by coaxial helicity injection |
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Authors: | Raman R Jarboe T R Nelson B A Izzo V A O'Neill R G Redd A J Smith R J |
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Institution: | University of Washington, Seattle, Washington 98195, USA. |
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Abstract: | The first successful results on the transfer of a coaxial helicity injection (CHI) produced discharge to inductive operation are reported. CHI-assisted plasma startup is more robust than inductive only operation. After hand off for inductive operation, the initial 90 kA of CHI-produced current drops to 40 kA, then ramps up to 170 kA, using only 30 mV s, more than 30% higher than that produced by induction alone. These significant performance enhancing results were obtained on the HIT-II spherical torus experiment (major/minor radius of 0.3/0.2 m). |
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