Author:
Hemsworth R.,Decamps H.,Graceffa J.,Schunke B.,Tanaka M.,Dremel M.,Tanga A.,De Esch H.P.L.,Geli F.,Milnes J.,Inoue T.,Marcuzzi D.,Sonato P.,Zaccaria P.
Abstract
The ITER neutral beam (NB) injectors are the first injectors that will have to
operate under conditions and constraints similar to those that will be encountered in
a fusion reactor. These injectors will have to operate in a hostile radiation
environment and they will become highly radioactive due to the neutron flux from
ITER. The injectors will use a single large ion source and accelerator that will
produce 40 A 1 MeV D− beams for pulse lengths of up to 3600 s.
Significant design changes have been made to the ITER heating NB (HNB) injector over
the past 4 years. The main changes are:
Modifications to allow installation and maintenance of the beamline
components with an overhead crane.
The beam source vessel shape has been changed and the beam source moved
to allow more space for the connections between the 1 MV bushing and the
beam source.
The RF driven negative ion source has replaced the filamented ion source
as the reference design.
The ion source and extractor power supplies will be located in an air
insulated high voltage (−1 MV) deck located outside the tokamak building
instead of inside an SF6 insulated HV deck located above the
injector.
Introduction of an all metal absolute valve to prevent any tritium in the
machine to escape into the NB cell during maintenance.
This paper describes the status of the design as of December 2008 including
the above mentioned changes.
The very important power supply system of the neutral beam injectors is not described
in any detail as that merits a paper beyond the competence of the present
authors.
The R&D required to realize the injectors described in this paper must be carried
out on a dedicated neutral beam test facility, which is not described here.
Subject
Condensed Matter Physics,Nuclear and High Energy Physics
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4. Modeling of secondary emission processes in the negative ion based electrostatic accelerator of the international thermonuclear experimental reactor;Phys. Rev. Special Top.-Accel. Beams,2008
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