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 longitudinal and transverse beam dynamics of the Drive Beam injector has been studied in detail and optimized. The injector consists of a thermionic gun followed by a bunching system, some accelerating structures, and a magnetic chicane. The bunching system contains three sub-harmonic bunchers, a prebuncher, and a traveling wave buncher all embedded in a solenoidal magnetic field. The main characteristic of the Drive Beam injector is the phase coding process done by the sub-harmonic bunching system operating at half the acceleration frequency. This process is essential for the frequency multiplication of the Drive Beam. During the phase coding process the unwanted satellite bunches are produced that adversely affects the machine power efficiency. The main challenge is to reduce the population of particles in the satellite bunches in the presence of strong space-charge forces due to the high beam current. The simulation of the beam dynamics has been carried out with parmela with the goal of optimizing the injector performance compared to the existing model studied for the Conceptual Design Report (CDR). The emphasis of the optimization was on decreasing the satellite population, the beam loss in the magnetic chicane and limiting the beam emittance growth in transverse plane.
Highlights
The Compact Linear Collider (CLIC) is a future multi-TeV electron-positron collider under study at CERN
In the CLIC acceleration scheme, 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
This paper describes a re-optimization of the CLIC Drive Beam injector in order to minimize the satellite population and loses
Summary
The Compact Linear Collider (CLIC) is a future multi-TeV electron-positron collider under study at CERN. In the CLIC acceleration scheme, 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 Drive Beam loses its energy in special RF structures (decelerators) called Power Extraction and Transfer Structures or PETS. Such a Drive Beam scheme is more power efficient than the standard klystron powering because as explained, the Drive Beam is generated and accelerated with low frequency high-efficiency klystrons. This Drive beam goes through a frequency n Corresponding author at: Institute for Research in Fundamental Sciences (IPM), School of Particles and Accelerators, P.O. Box 19395-5531, Tehran, Iran. The beam dynamics simulations represented in this paper have been carried out with PARMELA [3] and the results are compared with the previous model studied for the CDR [1]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
