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Flux Consumption Optimization and the Achievement of 1MA Discharge on NSTX.

DE2001768655

Publication Date	2000
Personal Author	Menard, J.; LeBlanc, B.; Sabbagh, S. A.; Bell, M.; Bell, R.
Page Count	8
Abstract	The spherical tokamak (ST), because of its slender central column, has very limited volt-second capability relative to a standard aspect ratio tokamak of similar plasma cross-section. Recent experiments on the National Spherical Torus Experiment (NSTX) have begun to quantify and optimize the ohmic current drive efficiency in a MA-class ST device. Sustainable ramp-rates in excess of 5MA/sec during the current rise phase have been achieved on NSTX, while faster ramps generate significant MHD activity. Discharges with IP exceeding 1MA have been achieved in NSTX with nominal parameters: aspect ratio A=1.3-1.4, elongation k=2-2.2, triangularity d=0.4, internal inductance li=0.6, and Ejima coefficient CE =0.35. Flux consumption efficiency results, performance improvements associated with first boronization, and comparisons to neo-classical resistivity are described.
Keywords	Thermonuclear reactors Tokamak devices Aspect ratio Efficiency Elongation Iaea Inductance Italy Nuclear energy Optimization Plasma
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Princeton Univ., NJ. Plasma Physics Lab.; Department of Energy, Washington, DC.
Document Type	Conference Proceedings
NTIS Issue Number	200123
Contract Number	AC02-76CH03073

Flux Consumption Optimization and the Achievement of 1MA Discharge on NSTX.

Flux Consumption Optimization and the Achievement of 1MA Discharge on NSTX.
DE2001768655

Publication Date	2000
Personal Author	Menard, J.; LeBlanc, B.; Sabbagh, S. A.; Bell, M.; Bell, R.
Page Count	8
Abstract	The spherical tokamak (ST), because of its slender central column, has very limited volt-second capability relative to a standard aspect ratio tokamak of similar plasma cross-section. Recent experiments on the National Spherical Torus Experiment (NSTX) have begun to quantify and optimize the ohmic current drive efficiency in a MA-class ST device. Sustainable ramp-rates in excess of 5MA/sec during the current rise phase have been achieved on NSTX, while faster ramps generate significant MHD activity. Discharges with IP exceeding 1MA have been achieved in NSTX with nominal parameters: aspect ratio A=1.3-1.4, elongation k=2-2.2, triangularity d=0.4, internal inductance li=0.6, and Ejima coefficient CE =0.35. Flux consumption efficiency results, performance improvements associated with first boronization, and comparisons to neo-classical resistivity are described.
Keywords	Thermonuclear reactors Tokamak devices Aspect ratio Efficiency Elongation Iaea Inductance Italy Nuclear energy Optimization Plasma
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Princeton Univ., NJ. Plasma Physics Lab.; Department of Energy, Washington, DC.
Document Type	Conference Proceedings
NTIS Issue Number	200123
Contract Number	AC02-76CH03073