$2\times250$ GeV CLIC $γγ$ Collider Based on its Drive Beam FEL
Abstract
CLIC is a linear $e^+e^-$ ($γγ$) collider project which uses a drive beam to accelerate the main beam. The drive beam provides RF power for each corresponding unit of the main linac through energy extracting RF structures. CLIC has a wide range of center-of-mass energy options from 150 GeV to 3 TeV. The present paper contains optimization of Free Electron Laser (FEL) using one bunch of CLIC drive beam in order to provide polarized light amplification using appropriate wiggler and luminosity spectrum of $γγ$ collider for $E_{cm}$=0.5 TeV. Then amplified laser can be converted to a polarized high-energy $γ$ beam at the Conversion point (CP-prior to electron positron interaction point) in the process of Compton backscattering. At the CP a powerful laser pulse (FEL) focused to main linac electrons (positrons). Here this scheme described and it is show that CLIC drive beam parameters satisfy the requirement of FEL additionally essential undulator parameters has been defined. Achievable $γγ$ luminosity is above $10^{34}$.
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