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Paper   IPM / Particles And Accelerator / 14400
School of Particles and Accelerator
  Title:   CTF3 Drive Beam Injector Optimisation
1.  Shahin Sanaye Hajari
2.  Seyed Hamed Shaker
3.  S. Doebert
  Status:   Published
  Journal: CERN-ACC-2016-0002 ; CLIC-Note-1060
  Year:  2015
  Supported by:  IPM
In the Compact Linear Collider (CLIC) the RF power for the acceleration of the Main Beam is extracted from a high-current Drive Beam that runs parallel to the main linac. The main feasibility issues of the two-beam acceleration scheme are being demonstrated at CLIC Test Facility 3 (CTF3). The CTF3 Drive Beam injector consists of a thermionic gun followed by the bunching system and two accelerating structures all embedded in solenoidal magnetic field and a magnetic chicane. Three sub-harmonic bunchers (SHB), a prebuncher and a travelling wave buncher constitute the bunching system. The phase coding process done by the sub-harmonic bunching system produces unwanted satellite bunches between the successive main bunches. The beam dynamics of the CTF3 Drive Beam injector is reoptimised with the goal of improving the injector performance and in particular decreasing the satellite population, the beam loss in the magnetic chicane and the beam emittance in transverse plane compare to the original model based on P. Urschuetz works.

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