A new operational regime has been observed in neutral-injection-heated ASDEX divertor discharges. This regime is characterized by high βₚ values comparable to the aspect ratio A(βₚ<~0.65A) and by confinement times close to those of Ohmic discharges. The high-βₚ regime develops at an injection power {≥}1.9 MW, a mean density n̄ₑ>~3×10¹³ cm^-3, and a $q(a)$ value {≥}2.6. Beyond these limits or in discharges with material limiter, low βₚ values and reduced particle and energy confinement times are obtained compared to the Ohmic heating phase.
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Wagner et al. (1982) studied this question.