CERN Accelerating science

Preprint
Report number	CERN-ACC-2016-0002 ; CLIC-Note-1060
Title	CTF3 Drive Beam Injector Optimisation
Author(s)	Sanaye Hajari, Shahin (IPM, Tehran ; CERN) ; Shaker, H (IPM, Tehran ; CERN) ; Doebert, S (CERN)
Publication	2015
Imprint	30 Jun 2015
Number of pages	9
Subject category	Accelerators and Storage Rings
Accelerator/Facility, Experiment	CLIC ; CTF3
Study	CLIC
Abstract	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.
Submitted by	[email protected]