  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.
