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- W1567302899 abstract "High poloidal beta discharges have been produced in TFTR that achieved high fusion reactivities at low plasma currents. By rapidly decreasing the plasma current just prior to high-power neutral beam injection, relatively peaked current profiles were created having high l{sub i} > 2, high Troyon-normalized beta, {beta}N > 3, and high poloidal beta. {beta}{sub p} {ge} 0.7 R/a. The global energy confinement time after the current ramp was comparable to supershots, and the combination of improved MHD stability and good confinement produced a new high {epsilon}{beta}{sub p} high Q{sub DD} operating mode for TFTR. Without steady-state current profile control, as the pulse lengths of high {beta}p discharges were extended, l{sub i} decreased, and the improved stability produced immediately after by the current ramp deteriorated. In four second, high {epsilon}{beta}{sub p} discharges, the current profile broadened under the influence of bootstrap and beam-drive currents. When the calculated voltage throughout the plasma nearly vanished, MHD instabilities were observed with {beta}{sub N} as low as 1.4. Ideal MHD stability calculations showed this lower beta limit to be consistent with theoretical expectations." @default.
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- W1567302899 date "1993-04-01" @default.
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- W1567302899 title "Achieving high fusion reactivity in high poloidal beta discharges in TFTR" @default.
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