Design study of an optical cavity for a future photon collider at ILC

Abstract

Hard photons well above 100 GeV have to be generated in a future photon-collider which essentially will be based on the infrastructure of the planned International Linear Collider (ILC). The energy of near-infrared laser photons will be boosted by Compton backscattering against a high energy relativistic electron beam. For high effectiveness, a very powerful lasersystem is required that exceeds todays state-ofthe-art capabilities. In this paper a design of an auxiliary passive cavity is discussed that resonantly enhances the peak-power of the laser. The properties and prospects of such a cavity are addressed on the basis of the specifications for the European TeV Energy Superconducting Linear Accelerator (TESLA) proposal. Those of the ILC are expected to be similar.

Gamma gamma technology group

“…Klemz et al [3] have worked out a detailed design proposal for the laser cavity for use at the PLC. An overview of the layout is shown in figure 1.…”

The ABCD matrix for parabolic reflectors and its application to astigmatism free four-mirror cavities

“…Fabry-Perot cavities [1] are nowadays used to stack high average-and peak-power pulsed laser-beams in various applications: quasi-monochromatic X/γ ray beam production [2][3][4], high harmonic generation [5], polarized positron production [6], nuclear waste management [7], γ γ -collisions [8]. However, since the mode properties of these resonators solely depend on their geometries, specific optical designs must be supplied to fulfill the requirements of these applications.…”

“…Three-mirror cavities either consisting of three concave or two concave and one flat reflective surfaces can thus be considered. However, in these configurations the odd number of reflective surfaces acts as a linear polarizer filter [10] which can be incompatible with some applications [6,8]. There is also no flexibility to vary the cavity-mode beam-waist size and the cavity round-trip length independently which can also be an issue in some cases [2,11].…”

Meeting to discuss laser cavity design for photon linear collider — Daresbury, UK, 10 January 2006

“…The purpose of the meeting was to discuss the paper by Klemz et al [1] which is a detailed analysis of a possible design of laser cavity system for use in the photon linear collider [2].…”