Extensions and simulations for a versatile multiaperture negative-ion source.

Veltri P., Cavenago M., Serianni G., Antoni V., Barbisan M., De Muri M., Fagotti E., Kulevoy T., Pasqualotto R., Petrenko S., Sartori E., Taccogna T., Variale V.
  Venerdì 30/09   09:00 - 12:00   Edificio Psicologia 2 - Aula 2B   II - Fisica della materia
The operation of the ion source NIO1 (Negative-Ion Optimization 1) developed by Consorzio RFX and INFN gives the possibility of validating simulation models and innovations on an easily accessible Italian installation, with a multiaperture extraction (9 beamlets) as the larger sources (up to 1280 beamlets) developed for heating of fusion plasmas with Neutral Beam Injectors. The related modeling, including particle in cell, fluid and ray tracing codes, is presently aimed at the study of plasma dynamic, negative-ion extraction and acceleration and beam space charge compensation. In this contribution the status of numerical models is discussed and their results compared with measurements at NIO1. Some studies for an energy recovery system are also described.