MAGNETIC SEPARATRIX EXPERIMENTS IN JET
Magnetic separatrix configurations have been produced in JET for plasma currents up to 3MA. Experimental results with these configurations show that some features common to divertor tokamaks can be achieved. In ohmic discharges high recycling regimes can be produced. In neutral beam heated discharges, substantial improvement of the energy confinement time is produced together with the characteristic signatures of an H mode. These characteristics include improved particle confinement, flatter density profile, and an increase in electron temperature especially at the edge leading to a characteristic pedestal feature. At higher neutral beam power, higher plasma densities are reached, with deterioration of beam penetration and strong radiation losses in the outer region of the plasma. The global energy confinement time in the H mode is observed in degrade with additional power. However, results of radial power balance analysis suggest that in the central region where the radiation is not important the degradation of confinement is small.
Bibliographic Reference: WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON, OX14 3EA (UK) MENTIONING REPORT JET-P(87)11, 1987
Record Number: 1989126055900 / Last updated on: 1989-03-01
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