Study of an injector (Induction Microtron) for giant cluster ion inertial fusion driver (G-CLIF)

The use of Induction Microtron (IM) as an injector of a two-way multiplex induction synchrotron for the giant cluster ions inertial fusion driver has been studied. The IM is designed to accelerate high charge-state C-60 cluster ions from 10 MeV to 144 MeV. A typical bending magnet with a reverse field in its front and gradient field in the main dipole region, which gives the sufficient enough focusing in the vertical direction, is used. The various intrinsic natures in the transverse orbit beam properties has been manifested. The inherent COD is one of typical ones, which needs to be minimized by optimizing bending magnet design and introducing additional steering magnets. As a result of extensive trial, the dispersion-free on the long straight-section lattice has been achieved, which is crucial to avoid the emittance blow-up due to synchro-beta coupling. The beam with a momentum spread of Δp/p = 0.00193 can be well-confined and accelerated by applying 1 kV barrier voltage and 10 kV acceleration induction voltage. (author)