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SUMMARY:Towards the NBI Requirements at ITER: 20 A Negative Hydrogen Ion B
 eams for Up to 1 Hour at the ELISE Test Facility
DTSTART:20170320T103000
DTEND:20170320T113000
DTSTAMP:20260610T054233Z
UID:cac46d6b1229b28ebe5d1c46dc9d1b2e18d3fbf0204080cba2674859
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Ursel Fantz\nMax-Planck-Institut für Plasmaphysik (IPP)
 \, Garching\, Germany\nThe RF ion source test facility ELISE (Extraction f
 rom a Large Ion Source Experiment) operated at IPP is part of the R&D road
 map of the European ITER domestic agency F4E for the ITER neutral beam inj
 ection systems. ELISE is dedicated to demonstrate the ITER requirements in
  terms of extracted negative hydrogen densities (329 A/m2 H‾\, 286 A/m2 
 D‾) at an electron-to-ion ratio of less than one for a source of the sam
 e width but only half the height of the ITER source (0.9 x 1 m2). Hence\, 
 at an extraction area of 0.1 m2 and considering the stripping losses an ac
 celerated current of 20 A D‾ has to be demonstrated.  The low temperatu
 re plasma is generated by four drivers powered by two RF generators with 1
 80 kW generator power each at a frequency of 1 MHz. At a source pressure o
 f 0.3 Pa the negative ions are created predominately via the surface conve
 rsion process\, i.e. the conversion of mainly atoms and positive ions at s
 urfaces with a low work function\, for which caesium is evaporated into th
 e source. Stable beams have to be achieved up to 3600 s with a beam unifor
 mity of better than 90%.\n\nThe developments and major steps at the ELISE 
 test facility will be described in the talk addressing also the latest res
 ults and the major issues for long pulse operation. A brief outline of the
  next major steps within the European Neutral Beam Test Facility for the d
 evelopment of successful ITER NBI systems will be given as well.
LOCATION:PPB019
STATUS:CONFIRMED
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