Cavenago, M. (2016) Initial experiments with a versatile multi-aperture negative-ion source and related improvements. Il nuovo cimento C, 39 (2). pp. 1-10. ISSN 1826-9885
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Abstract
A relatively compact ion source, named NIO1 (Negative-Ion Optimization 1), with 9 beam apertures for H− extraction is under commissioning, in collaboration between Consorzio RFX and INFN, to provide a test bench for source optimizations, for innovations, and for simulation code validations in support of Neutral Beam Injectors (NBI) optimization. NIO1 installation includes a 60 kV high-voltage deck, power supplies for a 130mA ion nominal current, an X-ray shield, and beam diagnostics. Plasma is heated with a tunable 2MHz radiofrequency (rf) generator. Physical aspects of source operation and rf-plasma coupling are discussed. NIO1 tuning procedures and plasma experiments both with air and with hydrogen as filling gas are described, up to a 1.7 kW rf power. Transitions to inductively coupled plasma are reported in the case of air (for a rf power of about 0.5 kW and a gas pressure below 2Pa), discussing their robust signature in optical emission, and briefly summarized for hydrogen, where more than 1 kW rf power is needed.
| Item Type: | Article |
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| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 29 Sep 2020 16:06 |
| Last Modified: | 29 Sep 2020 16:06 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/19288 |
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