Charge exchange fluxes of ripple trapped slowing-down ions during L-to-H transition and ELMs

Neutral fluxes from charge exchange with ripple-trapped particles show a remarkably different behaviour during L and H mode; their measurement provides a new diagnostic for the mode discrimination of the plasma. A possible reason for the changes of the fluxes is the action of a radial electric field. This seems to grow steadily after the L-to-H transition with a strong increase (jump in the ms range) at the transition to the quiescent H-mode. During ELMs the fluxes reduce to L-mode level. Measurements with 100 #mu# time resolution show no action in the fluxes piror to the change in the D_#alpha#-signal at the start of type 1 ELM. (orig.)17 refs.Available from TIB Hannover: RA 71(1/288) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman