Phys. Rev. Lett. 49, 1408–1412 (1982)Regime of Improved Confinement and High Beta in Neutral-Beam-Heated Divertor Discharges of the ASDEX TokamakReceived 6 August 1982; revised 1 October 1982; published in the issue dated 8 November 1982 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 n̅ e>~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. © 1982 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.49.1408
DOI:
10.1103/PhysRevLett.49.1408
PACS:
52.55.Gb, 52.50.Gj
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