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  4. R&D around a photoneutralizer-based NBI system (Siphore) in view of a DEMO Tokamak steady state fusion reactor
 
research article

R&D around a photoneutralizer-based NBI system (Siphore) in view of a DEMO Tokamak steady state fusion reactor

Simonin, A.
•
Achard, Jocelyn
•
Achkasov, K.
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2015
Nuclear Fusion

Since the signature of the ITER treaty in 2006, a new research programme targeting the emergence of a new generation of neutral beam (NB) system for the future fusion reactor (DEMO Tokamak) has been underway between several laboratories in Europe. The specifications required to operate a NB system on DEMO are very demanding: the system has to provide plasma heating, current drive and plasma control at a very high level of power (up to 150 MW) and energy (1 or 2 MeV), including high performances in term of wall-plug efficiency (eta > 60%), high availability and reliability. To this aim, a novel NB concept based on the photodetachment of the energetic negative ion beam is under study. The keystone of this new concept is the achievement of a photoneutralizer where a high power photon flux (similar to 3 MW) generated within a Fabry-Perot cavity will overlap, cross and partially photodetach the intense negative ion beam accelerated at high energy (1 or 2 MeV). The aspect ratio of the beam-line (source, accelerator, etc) is specifically designed to maximize the overlap of the photon beam with the ion beam. It is shown that such a photoneutralized based NB system would have the capability to provide several tens of MW of D-0 per beam line with a wall-plug efficiency higher than 60%. A feasibility study of the concept has been launched between different laboratories to address the different physics aspects, i.e. negative ion source, plasma modelling, ion accelerator simulation, photoneutralization and high voltage holding under vacuum. The paper describes the present status of the project and the main achievements of the developments in laboratories.

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Type
research article
DOI
10.1088/0029-5515/55/12/123020
Web of Science ID

WOS:000366534500022

Author(s)
Simonin, A.
Achard, Jocelyn
Achkasov, K.
Bechu, S.
Baudouin, C.
Baulaigue, O.
Blondel, C.
Boeuf, J. P.
Bresteau, D.
Cartry, G.
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Date Issued

2015

Publisher

IOP Publishing Ltd

Published in
Nuclear Fusion
Volume

55

Issue

12

Article Number

123020

Subjects

plasma modelling

•

negative ions

•

neutral beams

•

DEMO

•

helicon

•

photoneutralization

•

HV bushing

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC  
Available on Infoscience
February 16, 2016
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/123993
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