Plasma production and beam extraction from a versatile multiaperture negative ion source.

Cavenago M., Antoni V., Barbisan M., De Muri M., Galatà A., Kulevoy T., Pasqualotto R., Petrenko S., Recchia M., Serianni G., Veltri P., Zaniol B.
  Venerdì 30/09   15:00 - 18:00   Edificio Psicologia 2 - Aula 3G   VI - Fisica applicata, Acceleratori e Beni Culturali
With the ion source NIO1 (Negative Ion Optimization 1) developed by Consorzio RFX and INFN, plasmas from different elements were produced, and beams of $H^{-}$ and $O^{-}$ were extracted; the co-extracted electrons are stopped by an intermediate electrode called extraction grid (EG), while ions are accelerated up to 60 keV by another grid and imaged onto a carbon fiber composite (CFC) tile. Gas mixing was used, with $N_{2}$ or Ar to help spectroscopy. Caesium vaporizers are separately tested; the source is operated with no cesium, so the current is limited below 10 mA and voltage below 25 kV.