Session RP1 - Poster Session VIII.
POSTER session, Thursday afternoon, October 30
Fran Hill Southeast Exhibit Hall, ACC
The ELMy H-mode plasma configuration is the most likely candidate, at the moment, for ITER and fusion based power plants. Hence it is very import to understand the workings of these plasmas. Recently on JET a large database of edge transport barrier, ETB, data has been gathered using the edge LIDAR Thomson scattering Diagnostic. This had been impossible before, due to system resolution limitations. Now a plasma configuration has been designed (DOC-U) with the last closed fluxsurface tangential to the edge LIDAR laser line of sight, effectively increasing the spatial resolution to ~ 2 cm. The results obtained from this database are shown [1] to be contradictory to expectations and other experiments [2,3]. It shows that the ETB gradients decrease with an increasing Greenwald density fraction and the pedestal width increases. In this paper these results are expanded and further analysed, to achieve a better understanding of the ELMy H-mode plasma edge behaviour in JET.
[1] M. Kempenaars, et al, 30th EPS 2003, St. Petersburg, 5-11 July 2003 [2] G. Saibene, et al, Plasma Physics and Controlled Fusion 2002 [3] A. Kallenbach, et al, 30th EPS 2003, St. Petersburg, 5-11 July 2003