DIII-D Results and Plans

Download or read book DIII-D Results and Plans written by and published by . This book was released on 1990 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The completion of additional radiation shielding in the spring of 1989 has allowed the DIII-D tokamak to enter a new phase of experimental operation, in which the potential of injecting deuterium beam injection into deuterium plasmas has been exploited. The benefit of the isotope effect in increased energy confinement time, and increased power delivery by the neutral beam injectors, has been used to extend the machine performance. Plasma beta values ([beta]{sub T} ≤ 10.7%) near expected theoretical limits (3.5 I/aB) have been obtained and high energy content discharges with [beta]{sub T} = 5.2% have been achieved at full magnetic field (2.1 T). The stored energy has reached 3.6 MJ and diverted plasmas with 3 MA have been produced. Enhanced (H-mode) energy confinement plasmas have been maintained for over 10 seconds with no indication of impurity accumulation. This paper presents a brief description of the shielding design; a discussion of the performance improvements of the neutral beam ion sources with deuterium; an overall review of plasma parameters achieved recently in the DIII-D tokamak; and a presentation of new hardware systems being brought on line (e.g. Advanced Divertor, Fast Wave Current Drive, and 110 GHz ECH). 9 refs., 4 figs., 1 tab.