A concept of the photon collider beam dump

TL;DR

This paper proposes a novel beam dump design for photon colliders using a long, pressurized argon gas target and hydrogen gas to manage the high energy density of narrow, powerful photon beams, reducing overheating and neutron background.

Contribution

It introduces a new beam dump concept employing pressurized gas targets to safely dissipate the energy of high-power photon beams at colliders.

Findings

Design effectively prevents overheating and mechanical stress.

Neutron background is estimated and reduced with hydrogen gas.

Proposed solution is feasible for ILC-based photon colliders.

Abstract

Photon beams at photon colliders are very narrow, powerful (10--15 MW) and cannot be spread by fast magnets (because photons are neutral). No material can withstand such energy density. For the ILC-based photon collider, we suggest using a 150 m long, pressurized (P ~ 4 atm) argon gas target in front of a water absorber which solves the overheating and mechanical stress problems. The neutron background at the interaction point is estimated and additionally suppressed using a 20 m long hydrogen gas target in front of the argon.