“School of Particles And Accelerator”

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Paper   IPM / Particles And Accelerator / 13784
School of Particles and Accelerator
  Title:   2- Beam Dynamics Studies of the CLIC Drive Beam Injector complex
  Author(s): 
1.  Shahin Sanaye Hajari
2.  Seyad Hamed Shaker
3.  S Doebert
  Status:   In Proceedings
  Proceeding: Proceedings of LINAC2014, Geneva, Switzerland
  Year:  2014
  Supported by:  IPM
  Abstract:
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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