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A recently developed plasma-wall self-organization (PWSO) model predicts asignificantly enhanced density limit, which may be attainable in tokamaks withECRH-assisted ohmic startup and sufficiently high initial neutral density.Experiments have been conducted on J-TEXT to validate such a density limitscenario based on this model. Experimental results demonstrate that increasingthe pre-filled gas pressure or ECRH power during the startup phase caneffectively enhance plasma purity and raise the density limit at the flat-top.Despite the dominant carbon fraction in the wall material, some dischargesapproach the edge of the density-free regime of the 1D model of PWSO.

Validation of the plasma-wall self-organization model for density limit in ECRH-assisted start-up of Ohmic discharges on J-TEXT