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Enhanced energy confinement and performance in a low-recycling tokamak
Authors:Majeski R  Doerner R  Gray T  Kaita R  Maingi R  Mansfield D  Spaleta J  Soukhanovskii V  Timberlake J  Zakharov L
Institution:Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
Abstract:Extensive lithium wall coatings and liquid lithium plasma-limiting surfaces reduce recycling, with dramatic improvements in Ohmic plasma discharges in the Current Drive Experiment-Upgrade. Global energy confinement times increase by up to 6 times. These results exceed confinement scalings such as ITER98P(y,1) by 2-3 times, and represent the largest increase in energy confinement ever observed for an Ohmic tokamak plasma. Measurements of Dalpha emission indicate that global recycling coefficients decrease to approximately 0.3, the lowest documented for a magnetically confined hydrogen plasma.
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