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in publisher: "General Atomics, San Diego, CA United States"  
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q Profile evolution and enhanced core confinement of high {beta}{sub p} plasmas in DIII-D

Description: In DIII-D the authors have investigated the long pulse evolution of high poloidal beta ({sub beta}{sub p}), double-null diverted H-mode discharges, which exhibit high bootstrap current fractions attractive for a reactor. At low currents I{sub p}, the current profile evolved over several seconds and the on-axis safety factor (q{sub 0}) increased. When q{sub 0} increased above {approximately}2, the MHD character changed from an m/n = 2/1 to an m/n = 3/1 internal kink mode, where m(n) are poloidal… more
Date: October 1, 1994
Creator: Stallard, B. W.; Casper, T. A. & Fenstermacher, M. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The Role of Shaping in Achieving High Performance in DIII-D

Description: Experiments to study the effect of plasma shape on performance show that the high performance levels characteristic of VH-mode plasmas are only obtained for high triangularity ({delta}). A characteristic difference in central heating efficiency is observed when high and low {delta} plasmas are compared. The authors find this difference to correlate well with the attainment of Mercier stability. The core plasma for the high {delta} cases achieves Mercier stability when q{sub 0} rises above a cri… more
Date: October 1, 1994
Creator: Lazarus, E. A.; Hyatt, A. W. & Osborne, T. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Installation and initial operation of the DIII-D advanced divertor cryocondensation pump

Description: Phase two of a divertor cryocondensation pump, the Advanced Divertor Program, is now installed in the DIII-D tokamak at General Atomics and complements the phase one biasable ring electrode. The installation consists of a 10 m long cryocondensation pump located in the divertor baffle chamber to study plasma density control by pumping of the divertor. The design is a toroidally electrically continuous liquid helium-cooled panel with 1 m{sup 2} of pumping surface. The helium panel is single point… more
Date: October 1, 1993
Creator: Smith, J. P.; Schaubel, K. M.; Baxi, C. B.; Campbell, G. L.; Hyatt, A. W.; Laughon, G. J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Divertor Research on the DIII-D Tokamak

Description: In this paper the authors summarize recent progress on DIII-D in developing techniques for divertor power and particle control relevant to next generation tokamaks such as the proposed ITER and TPX devices. Density control and helium removal by divertor pumping have been demonstrated for the first time in high confinement ELMing H-mode discharges ({tau} {approximately} 2 {times} {tau}{sub ITER-89P}) following installation of a divertor cryopumping system. The peak divertor heat flux in similar … more
Date: October 1, 1994
Creator: Hill, D. N.; Allen, S. L. & Brooks, N. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Performance characteristics of the DIII-D advanced divertor cryopump

Description: A cryocondensation pump, cooled by forced flow of two-phase helium, has been installed for particle exhaust from the divertor region of the DIII-D tokamak. The Inconel pumping surface is of coaxial geometry, 25.4 mm in outer diameter and 11.65 m in length. Because of the tokamak environment, the pump is designed to perform under relatively high pulsed heat loads (300 Wm{sup {minus}2}). Results of measurements made on the pumping characteristics for D{sub 2}, H{sub 2}, and Ar are discussed.
Date: October 1, 1993
Creator: Menon, M. M.; Maingi, R.; Wade, M. R.; Baxi, C. B.; Campbell, G. L.; Holtrop, K. L. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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