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The plasma breakdown in HL-2A is found to match the Paschen law similar to the other tokamaks. It is also found on HL-2A that the breakdown time is about 10ms, which is a little short for its high toroidal electric field (E∼1.0–2.0Vm−1), and the breakdown happens when the criterion of E×L (connection length) is about 33V relative to a theoretical prediction of 67V. Flux consumption optimization is...
The area of plasma breakdown on HL-2A with pure Ohmic discharge is on the low field side(LFS) where the field null configuration is located, and the emission of Dα which was measured by CCD camera confirms the plasma formation area, the current of Vertical Field(VF) is an important factor to facilitate plasma breakdown. The effect of the prefill pressure on plasma breakdown is studied carefully by...
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