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(EXP2/12) Highly Radiative Plasmas for Local Transport Studies and Power and Particle Handling in Reactor Regimes

K. W. Hill, M. G. Bell, R. Budny, C. E. Bush¹, D. R. Ernst, G. W. Hammett, D. Mikkelsen, H. Park, A. T. Ramsey, S. Sabbagh², S. D. Scott, E. J. Synakowski, G. Taylor, and M. C. Zarnstorff

Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ 08543, USA
¹ Oak Ridge National Laboratory, Oak Ridge, TN
² Columbia University, New York, NY

Abstract.  To study the applicability of artificially enhanced impurity radiation for mitigation of the plasma-limiter interaction in reactor regimes, krypton and xenon gases were injected into TFTR supershots and high-li plasmas. At neutral beam injection (NBI) powers P_B $\leq$ 30MW, carbon influxes (blooms) were suppressed, leading to improved energy confinement and neutron production in both D and DT plasmas, and the highest DT fusion energy production (7.6 MJ) in a TFTR pulse. Comparisons of the measured radiated power profiles with predictions of the MIST impurity transport code have guided studies of highly-radiative plasmas in ITER. The response of the electron and ion temperatures to greatly increased radiative losses from the electrons was used to study thermal transport mechanisms.

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