PARTICLE CONFINEMENT OF LIMITER-DOMINATED AND DIVERTOR-DOMINATED NBI PLASMAS IN CHS

Particle confinement time tau(p) has been obtained from measurements of poloidal and toroidal distributions of H alpha and Lyman alpha emissions in CHS. These particle confinement times range between 1.5 and 4ms at a constant line-averaged density of 3x10(13)cm(-3) for both cases of limiter- and divertor-dominated NBI plasmas with Ti-gettering. In these cases the energy confinement time tau(E) were between 2 and 3ms. The density decay characteristic time tau p* and global recycling coefficient R have been also measured for Ti-gettered plasmas and large tau p* values were observed. As a result high recycling rates (R>0.92) are obtained for a wide density range. For a limiter-dominated case of boronized plasmas (R(ax)=92.1cm) values of tau(p) were correlated with tau(E) and a linear correlation between them was found for normalized tau(E) to p(-0.58) which is a power degradation term in LHD empirical scaling.