The Role Of Secondary Electron Emission On The Ecr Plasma

The role of secondary electron emission from a metal dielectric structure introduced in the plasma chamber of an ECRIS is presented. Experiments at the Institute fur Kernphysik in Frankfurt/Main-Germany and Kernfysisch Versneller Instituut in Groningen, The Netherlands, demonstrated the high capabilities of these structures to enhance the high-charge-state ion production. The Ar16+ production was enhanced by two orders of magnitude as compared with the standard stainless steel plasma chamber without the metal dielectric structure.The influence on the main characteristics of the ECR plasma (plasma potential, electron temperature and electron density) was studied. Preliminary results obtained with a metal dielectric structure introduced in the plasma chamber of the ECR source SERSE at LNS - Catania are also presented.