Fusion Engineering and Design 56–57 (2001) 685–691
Engineering design of the steady state neutral beam injector
for SST-1
S.K. Mattoo *, A.K. Chakraborty, U.K. Baruah, P.K. Jayakumar,
M. Bandyopadhyay, N. Bisai, Ch. Chakrapani, M.R. Jana, Raja Onali,
V. Prahlad, P.J. Patel, G.B. Patel, B. Prajapati, N.V.M. Rao, S. Rambabu,
C. Rotti, S.K. Sharma, S. Shah, V. Sharma, M.J. Singh, N.P. Singh,
B. Sridhar
Institute for Plasma Research, Bhat, Gandhinagar 382 428, India
Abstract
The paper presents the complete engineering design of steady neutral beam injector, with emphasis on the deviation
in the design from conventional short pulse injectors. © 2001 Elsevier Science B.V. All rights reserved.
Keywords: Neutral beam injector; Reionisation loss; Short pulse injectors
www.elsevier.com/locate/fusengdes
1. Introduction
A single source beam line is expected to deliver
1.7 MW of (1000 S ON/5000 S OFF) neutral
beam power at 50 keV H operation and 80 keV D
operation [1] with 1 MW of beam power expected
in the full energy component. Fig. 1 shows an
elevation view of the SST-1 neutral beam injector
(NBI) beam line. The long pulse operation (LPO)
of the system desires additional design features to
be incorporated in the design of the back plate,
the neutraliser first stage, filament transformers,
magnet and dump arrangement and other compo-
nents. Active cooling using Cu–Cr–Zr heat trans-
fer elements (HTEs) (allowing low flow rates for
large temperature rise in water) has been incorpo-
rated in all the components exposed to the heat
flux. The power supply system incorporates active
power dissipation and the data acquisition and
control (DACS) incorporates data compression
techniques. This paper discusses the engineering
design features of the NBI system with a special
emphasis on the features incorporated to account
for the LPO ( 1000 S).
2. Injector components
2.1. Ion source
In configuration, the ion source is similar to the
multipole bucket source used in JET/TEXTOR
* Corresponding author. Tel.: +91-2712-69022; fax: +91-
2712-69017.
E-mail address: shiban@ipr.res.in (S.K. Mattoo).
0920-3796/01/$ - see front matter © 2001 Elsevier Science B.V. All rights reserved.
PII:S0920-3796(01)00388-X