High energy Photon Collider

TL;DR

This paper explores the feasibility and advantages of a high-energy photon linear collider based on existing electron-positron colliders, showing it can achieve significant luminosity and monochromatic photon spectra at TeV energies.

Contribution

It demonstrates that a high-energy photon collider at 1-2 TeV is feasible with comparable laser requirements to standard PLCs, offering improved luminosity and photon spectrum quality.

Findings

High-energy PLC can reach about 1/4 of standard PLC luminosity.

Photon spectrum is highly monochromatic with about 5% energy spread.

Laser system requirements are similar to those of standard PLCs.

Abstract

We discuss a high-energy photon linear collider (HE PLC) based on the $e^+e^-$ linear collider with cms electron energy $2E = 1 \div 2$ TeV (JLC, CLIC,...). This energy region was previously considered hopeless for experiment. On the contrary, the present study leads to a rather optimistic conclusions. We compare properties of HE PLC with those of the usually discussed {\it standard PLC} with $ E\approx 250$ GeV. We show that at the optimal choice of laser the high-energy \ggam luminosity integral is about 1/5, and the maximum luminosity is about 1/4 from similar values for the standard PLC. For this choice, the laser flash energy and laser-optical system should be approximately the same as those prepared for the standard PLC. The photon spectrum of HE PLC is much more monochromatic than that in the standard PLC, it is concentrated near the high-energy limit with an energy spread of about 5\%. It will be well separated from the low energy part.