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SUMMARY:The NIO1 negative ion source: investigation and operation experien
 ce
DTSTART;VALUE=DATE-TIME:20180904T074000Z
DTEND;VALUE=DATE-TIME:20180904T081000Z
DTSTAMP;VALUE=DATE-TIME:20261014T222834Z
UID:indico-contribution-302@indico.inp.nsk.su
DESCRIPTION:Speakers: Marco Cavenago (INFN-LNL)\nThe ion source NIO1 (Nega
 tive Ion Optimization 1) is a versatile multiaperture H$^-$ source capable
  of continuous regime operation\, with the plasma generated by a 2 MHz/2.5
  kW radiofrequency (rf) power supply and nine beamlet extraction\, operate
 d since 2014 in close collaboration between Consorzio RFX and INFN-LNL. It
  aims to partly reproduce the conditions of the much larger ion sources bu
 ilt or in construction for neutral beam injectors of fusion devices in a c
 ompact and modular ion source\, where effects of individual source compone
 nts can be rapidly verified and compared to simulation code results. \nDue
  to the need of assessing negative ion production limits (especially witho
 ut cesiation) in continuous operation for the perspective of future fusion
  reactors and to the large importance of magnetic field for source optimiz
 ation\, several configuration changes were tried (both inside the ion sour
 ce and for the embedded magnets inside the accelerator grids) were investi
 gated\, with material ranging from hard ferrite to SmCo to NdFeB\; evidenc
 e of the effect of the accelerator fringe field inside the ion source is d
 iscussed here and in companion presentations.\nThe radiofrequency system t
 akes full advantage of the frequency tuning amplifier capability (+/-150 k
 Hz installed\, 0/+20 kHz used)\, and it is worth noting that no adjustment
  of matching box capacitors was necessary in the last 3 years.\nMajor diag
 nostic systems (including CCD cameras and BES measurement) have been integ
 rated with the acquisition system along with the date measured by several 
 power supplies (including the high voltage supplies\, the rf generator and
  bias supplies\, the pressure measurements and the beam currents).\n\nhttp
 s://indico.inp.nsk.su/event/11/contributions/302/
LOCATION:
URL:https://indico.inp.nsk.su/event/11/contributions/302/
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