First Experimental Results of Tungsten Transport Investigations in the T-10 Tokamak Plasma

摘要

The investigations of tungsten transport in T-10 plasma are presented in the current paper. The process of tungsten accumulation in OH discharges and its dependence on parameters n(e), I-p, and Z(eff) are discussed. Peaked tungsten density profiles n(W)(r) are observed in plasmas with Z(eff) approximate to 1-1.5. In plasmas with Z(eff) approximate to 3-4, W accumulation is mainly integral with no profile peaking with regard to electron density n(e)(r). Lower densities of W are observed in discharges with a lithized T-10 vacuum vessel in comparison with plasma contaminated with light impurities. The disposal of W accumulation is produced by auxiliary ECRH input. During the central ECRH, the tungsten density profile flattens with the central density drop off by similar to 10 times together with W source increase up to 4 times.