Regime of Improved Confinement and High Beta in Neutral-Beam-Heated Divertor Discharges of the ASDEX Tokamak

✍ Scribed by Wagner, F.; Becker, G.; Behringer, K.; Campbell, D.; Eberhagen, A.; Engelhardt, W.; Fussmann, G.; Gehre, O.; Gernhardt, J.; Gierke, G.

• Book ID: 111931152
• Publisher: The American Physical Society
• Year: 1982
• Tongue: English
• Weight: 485 KB
• Volume: 49
• Category: Article
• ISSN: 0031-9007
• DOI: 10.1103/physrevlett.49.1408

✦ Synopsis

A new operational regime has been observed in neutral-injectionheated ASDEX divertor discharges. This regime is characterized by high P& values comparable to the aspect ratio A P& (0. 654) and by confinement times close to those of Ohmic discharges. The high-P& regime develops at an injection power ) j..9 MW, a mean density n, ~~3&& 10 cm 3, and a q(a) value ) 2.6. Beyond these limits or in discharges with material limiter, low P& values and reduced particle and energy confinement times are obtained compared to the Ohmic heating phase.