Abstract
Single null X-point discharges on COMPASS-D show a gradual L to H transition. Frequent boronization gives long ELM-free H-mode periods, duration > 100 ms, with continuously rising density to > 1.5 × 10 10 m −3. The LH transition threshold behaviour is more complex than that predicted by present simple scaling laws, with a well-defined low-density limit being observed and sensitivity to small perturbations at the plasma boundary. Density and recycling behaviour is analysed. In discharges refuelled by recycling alone, the coefficient of recycling as well as the particle confinement time is higher in H-mode periods.
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