THE STATUS OF RFP EXPERIMENTS
In this report recent advances in RFP experiments are presented and discussed, with emphasis on new developments. There are now five machines operating at currents of several hundred kA, routinely yielding temperatures of a few hundred eV (maximum 0.5-0.6 keV), densities of 10**13 - 10**14cm**-3 and beta-theta >= 0.1. It is found that the plasma density is important and there is a high density limit, beyond which the plasma is radiation cooled by light impurities, which can be expressed in terms of I/N (the limiting value is the same as the high density limit in Tokamaks). Various trends have been identified such that the highest temperatures generally correspond to the highest values of the streaming parameter and resistance anomaly factor and to the lowest densities. There is some data which indicate that the electron temperature scales as I**n with 0.5<=n<=1; n=1 corresponds to pressure balance with beta-theta times I/N constant. This is equivalent to the energy confinement time scaling as T-e**3/2 for which there is a little direct evidence but more data is needed to establish scaling laws.
Bibliographic Reference: WRITE TO UNIVERSITY DI PADOVA, VIA VIII FEBBRAIO 2, I-35100 PADOVA (ITALY), MENTIONING REPORT UPEE 82/09, 1982
Record Number: 1989122047200 / Last updated on: 1987-01-01
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