“School of Particles”
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| Paper IPM / Particles / 13784 |
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| Abstract: | |||||||
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In the Compact Linear Collider (CLIC) the RF power
for the acceleration of the Main Beam is extracted from a
high-current Drive B eam that runs parallel with the main
linac. The beam in the Drive Beam Accelerator is phase
coded. This means only every second accelerator bucket
is occupied. However, a few percent of particles are
captured in wrong buckets, called satellite bunches. The
phase coding is done via a sub-harmonic bunching system
operating at a half the acceleration frequency. The beam
dynamics of the Drive Beam injector complex has been
studied in detail and optimised. The model consists of a
thermionic gun, the bunching system followed by some
accelerating structures and a magnetic chicane. The
bunching system contains three sub-harmonic bunchers, a
prebuncher and a tapered travelling wave buncher all
embedded in a solenoidal magnetic field. The simulation
of the beam dynamics has been carried out with
PARMELA with the goal of optimising the overall
bunching process and in particular decreasing the satellite
population and the beam loss in magnetic chicane and in
transverse plane limiting the beam emittance growth
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