Abstract
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 achieved by scanning the loop voltage with identical target plasma current and heating with LHCD in the ramp-up phase. Based on Ohmic Heating during ramp-up phase, the limiter configuration consumes more flux than the divertor configuration. Adding LHCD during ramp-up phase reduces overall flux consumption.
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