Beam dump

[1] Beam blocks are simple optical elements that absorb a beam of light using a material with strong absorption and low reflectance.

[1] Materials commonly used for beam blocks include certain types of acrylic paint, carbon nanotubes, anodized aluminum, and nickel-phosphate coatings.

Dealing with the heat deposited can be an issue, since the energies of the beams to be absorbed can run into the megajoules.

[3] An example of a charged-particle beam dump is the one used by CERN for the Super Proton Synchrotron.

Currently, the SPS uses a beam dump that consists of graphite, molybdenum, and tungsten surrounded by concrete, marble, and cast-iron shielding.