First experiments with the negative ion source NIO1

M. Cavenago, G. Serianni, M. De Muri, P. Agostinetti, V. Antoni, C. Baltador, M. Barbisan, L. Baseggio, M. Bigi, V. Cervaro, F. Degli Agostini, E. Fagotti, T. Kulevoy, N. Ippolito, B. Laterza, A. Minarello, M. Maniero, R. Pasqualotto, S. Petrenko, M. PoggiD. Ravarotto, M. Recchia, E. Sartori, M. Sattin, P. Sonato, F. Taccogna, V. Variale, P. Veltri, B. Zaniol, L. Zanotto, S. Zucchetti

Research output: Contribution to journalArticle

30 Citations (Scopus)


Neutral Beam Injectors (NBIs), which need to be strongly optimized in the perspective of DEMO reactor, request a thorough understanding of the negative ion source used and of the multi-beamlet optics. A relatively compact radio frequency (rf) ion source, named NIO1 (Negative Ion Optimization 1), with 9 beam apertures for a total H-current of 130 mA, 60 kV acceleration voltage, was installed at Consorzio RFX, including a high voltage deck and an X-ray shield, to provide a test bench for source optimizations for activities in support to the ITER NBI test facility. NIO1 status and plasma experiments both with air and with hydrogen as filling gas are described. Transition from a weak plasma to an inductively coupled plasma is clearly evident for the former gas and may be triggered by rising the rf power (over 0.5 kW) at low pressure (equal or below 2 Pa). Transition in hydrogen plasma requires more rf power (over 1.5 kW).
Original languageEnglish
Article number02B320
Pages (from-to)-
JournalReview of Scientific Instruments
Issue number2
Publication statusPublished - 1 Feb 2016
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

Cavenago, M., Serianni, G., De Muri, M., Agostinetti, P., Antoni, V., Baltador, C., Barbisan, M., Baseggio, L., Bigi, M., Cervaro, V., Degli Agostini, F., Fagotti, E., Kulevoy, T., Ippolito, N., Laterza, B., Minarello, A., Maniero, M., Pasqualotto, R., Petrenko, S., ... Zucchetti, S. (2016). First experiments with the negative ion source NIO1. Review of Scientific Instruments, 87(2), -. [02B320].