DECREASE OF CENTRAL IRON CONCENTRATION IN LH HEATED FT DISCHARGES
We analyze the soft x-ray and spectroscopic signals obtained during F.T. discharges which experience a strong central electron heating by 150 kW of lower hybrid waves. It is shown that the central iron density decreases as a consequence of a variation of the ion transport. Radio frequency waves in the range of L.H. frequency have been successfully injected in Tokamak plasmas both for plasma heating and for non inductive current drive. An important aspect in these experiments with auxiliary heating is the effect of the R.F. power on the influx of heavy impurities which, if they penetrate within the discharge, could radiate away most of the additional power. The L.H. experiments carried out on the F.T. Tokamak are characterized by a sharp density limit (n-e +- 4-5 times 10**13 cm**-3 we observe a large enhancement of central electron temperature which rises up to 2 keV. The time behaviour of such a discharge is shown.
Bibliographic Reference: 11TH EUROPEAN CONFERENCE ON CONTROLLED FUSION AND PLASMA PHYSICS, AACHEN (GERMANY), SEPT. 5-9, 1983 IN ENEA REPORT 83.23/CC, PP. 21-24, 1983 WRITE TO ENEA + CENTRO RICERCHE ENERGIA FRASCATI, SERVIZIO STUDI E DOCUMENTAZIONE, C.P. 65 00044 FRASCATI, ROMA (I
Record Number: 1989122052300 / Last updated on: 1987-01-01
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