| R. Gobin*, K. Benmeziane, O. Delferrière, R. Ferdinand, F. Harrault, Commissariat à l’Energie
Atomique, DSM/DAPNIA/SACM - 91 Gif/Yvette - France
A. Girard, Commissariat à l’Energie Atomique, DSM/DRFMC/SBT - 38 Grenoble - France |
Low frequency ECR plasma sources have demonstrated
their efficiency, reproducibility and long life time for the
production of positive light ions. In 2003, the new
2.45 GHz ECR test stand based on a pure volume H- ion
production, developed at CEA/Saclay, showed a spectucar
increase of the extracted H- ion beam intensity. In fact, a
stainless steel grid now divides the plasma chamber in
two different parts: the plasma generator zone and the
negative ion production zone. By optimizing the grid
position and its potential with respect to the plasma
chamber, the negative ion current reached nearly 1 mA.
Ceramic plates covering the plasma chamber walls help
electron density and lead to an optimisation of the ion
production. A 1.32 mA H- extracted current has been
measured. New Langmuir probe measurements have also
been done on both sides of the grid. The last results are
reported and discussed. This work is supported by the
European Union under contract HPRI-CT-2001-50021. |
