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SUMMARY:SPIDER\, MITICA and company: N-NBI activities at Consorzio RFX
DTSTART:20180716T143000
DTEND:20180716T153000
DTSTAMP:20260427T215119Z
UID:a53896b35bac9f9124fbfef7d2b50e54211c0fcd4da37ccfd1385d2b
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Gianluigi Serianni\, Consorzio RFX\, Padova\, I\nThe ITER 
 experiment represents the next step in thermonuclear fusion researches. In
  order to reach the fusion conditions and to control the plasma configurat
 ion\, additional heating and current drive is required\, which will be pro
 vided by two neutral beam injectors (NBIs)\, each supplying 17MW. The beam
  particles (hydrogen or deuterium) will be electrostatically accelerated t
 o 1MeV\; effective gas-cell neutralisation at such beam energy is possible
  only for negative ions\, which are obtained by caesium-catalysed surface 
 conversion of hydrogen/deuterium atoms. The requirements of ITER NBIs (acc
 eleration to 1MeV of 40A negative hydrogen/deuterium ions) have never been
  simultaneously attained\, so that a dedicated Neutral Beam Test Facility 
 (NBTF) was set up at Consorzio RFX (Italy) also to verify the continuous o
 peration of the NBI for one hour\, while respecting stringent requirements
  in terms of beam optics (divergence <7mrad) and aiming  (within 2mrad). 
 To study and optimise the performances of the ITER NBI\, the NBTF includes
  two experiments: MITICA\, the full-scale ITER NBI prototype\, and SPIDER\
 , the full-scale prototype of the ITER NBI source with 100keV particle ene
 rgy. SPIDER aims at anticipating the investigations\, particularly concern
 ing source uniformity (1x2m2 area)\, negative ion current density and beam
  optics\, and has just entered into operation. Moreover the small\, flexib
 le negative ion source NIO1\, based on an RF plasma\, is operating at Cons
 orzio RFX since 4 years and some facilities address specific issues like t
 he .\nThe talk gives an outline of the investigation issues and of the fac
 ilities operating at Consorzio RFX. Coupling of radiofrequency to the plas
 ma\, voltage holding even in the presence of magnetic fields\, distributio
 n of caesium emitted by the caesium oven will be addressed by SPIDER exper
 imentation supplemented by the results of other small facilities specifica
 lly devoted to these issues and by the studies carried out in the NIO1 exp
 eriment. SPIDER operations will profit from a strong numerical activity\, 
 devoted to the simulation of the experimental scenarios\, and from refined
  diagnostic instruments\, expected to provide a thorough characterisation 
 of the plasma and the beam. Finally the talk will also present some result
 s of the first experiments in SPIDER\, including a preliminary characteris
 ation of the source plasma.\n 
LOCATION:PPB 019
STATUS:CONFIRMED
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