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Title: Ion source development for a photoneutralization based NBI system for fusion reactors

The next step after ITER is to demonstrate the viability and generation of electricity by a future fusion reactor (DEMO). The specifications required to operate an NBI system on DEMO are very demanding. The system has to provide a very high level of power and energy, ~100MW of D° beam at 1MeV, including high wall-plug efficiency (η > 60%). For this purpose, a new injector concept, called Siphore, is under investigation between CEA and French universities. Siphore is based on the stripping of the accelerated negative ions by photo-detachment provided by several Fabry-Perot cavities (3.5MW of light power per cavity) implemented along the D{sup −} beam. The beamline is designed to be tall and narrow in order that the photon flux overlaps the entire negative ion beam. The paper will describe the present R and D at CEA which addresses the development of an ion source and pre-accelerator prototypes for Siphore, the main goal being to produce an intense negative ion beam sheet. The negative ion source Cybele is based on a magnetized plasma column where hot electrons are emitted from the source center. Parametric studies of the source are performed using Langmuir probes in order to characterize the plasmamore » and to compare with numerical models being developed in French universities.« less
Authors:
; ; ; ; ; ;  [1] ;  [2]
  1. CEA-Cadarache, IRFM, F-13108 St. Paul-lez-Durance (France)
  2. (France)
Publication Date:
OSTI Identifier:
22391439
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1655; Journal Issue: 1; Conference: NIBS 2014: 4. International Symposium on Negative Ions, Beams and Sources, Garching (Germany), 6-10 Oct 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 43 PARTICLE ACCELERATORS; ANIONS; BEAM INJECTION HEATING; CEA; COMPARATIVE EVALUATIONS; DESIGN; EDUCATIONAL FACILITIES; ELECTRON EMISSION; ELECTRONS; ION BEAMS; ION EMISSION; ION SOURCES; ITER TOKAMAK; LANGMUIR PROBE; NEUTRAL ATOM BEAM INJECTION; PARAMETRIC ANALYSIS; PHOTONS; PLASMA; STRIPPING; VISIBLE RADIATION