After installation of Mo liners in the source NIO1 (Negative Ion Optimization phase 1), hydrogen plasmas in a continuous regime operation (much longer than one hour) are routinely maintained, with more than 1 kW rf power and 0.5 Pa pressure, allowing a systematic investigation of pure H- volume effect, which requests a much lower acceleration voltage Vs ≅ 12 kV than future Cs operations at Vs ≅ 60 kV. A new extraction grid EG was installed (replacing some eroded insulators) and preliminary beam images are compared to old EG ones, discussing effects of different deflection field strength and need of intermediate values. Large improvements in beam diagnostics and the effect of installation of a cryogenic pump are also reported.
Extraction of many H- beamlets from ion source NIO1 / M. Cavenago, G. Serianni, P. Veltri, M. De Muri, M. Agostini, V. Antoni, C. Baltador, P. Barbato, M. Barbisan, A. Barzon, L. Baseggio, M. Bigi, M. Brombin, L. Buonincontri, V. Cervaro, F.D. Agostini, E. Fagotti, L. Franchin, N. Ippolito, T. Kulevoy, B. Laterza, L. Lotto, A. Ludovici, G. Maero, M. Maniero, L. Migliorato, A. Minarello, P. Minelli, F. Molon, G. Moro, R. Pasqualotto, P. Jain, T. Patton, S. Petrenko, A. Pimazzoni, D. Ravarotto, M. Recchia, L. Romanato, M. Romé, F. Rossetto, E. Sartori, M. Sattin, F. Spinazzè, F. Stivanello, F. Taccogna, M. Tollin, L. Trevisan, M. Ugoletti, V. Variale, M. Zanini, B. Zaniol, S. Zucchetti, P. Sonato (AIP CONFERENCE PROCEEDINGS). - In: Proceedings of the 17th International Conference on Ion Sources[s.l] : American Institute of Physics Inc., 2018. - ISBN 9780735417274. - pp. 1-3 (( Intervento presentato al 17. convegno International Conference on Ion Sources tenutosi a Geneva nel 2017.
Extraction of many H- beamlets from ion source NIO1
G. Maero;M. Romé;
2018
Abstract
After installation of Mo liners in the source NIO1 (Negative Ion Optimization phase 1), hydrogen plasmas in a continuous regime operation (much longer than one hour) are routinely maintained, with more than 1 kW rf power and 0.5 Pa pressure, allowing a systematic investigation of pure H- volume effect, which requests a much lower acceleration voltage Vs ≅ 12 kV than future Cs operations at Vs ≅ 60 kV. A new extraction grid EG was installed (replacing some eroded insulators) and preliminary beam images are compared to old EG ones, discussing effects of different deflection field strength and need of intermediate values. Large improvements in beam diagnostics and the effect of installation of a cryogenic pump are also reported.
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