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A high energy beam absorber has been built for the Advanced SuperconductingTest Accelerator (ASTA) at Fermilab. In the facility's initial configuration,an electron beam will be accelerated through 3 TTF-type or ILC-type RFcryomodules to an energy of 750MeV. The electron beam will be directed to oneof multiple downstream experimental and diagnostic beam lines and thendeposited in one of two beam absorbers. The facility is designed to accommodateup to 6 cryomodules, which would produce a 75kW beam at 1.5GeV; this is thedriving design condition for the beam absorbers. The beam absorbers consist ofwater-cooled graphite, aluminum and copper layers contained in a Helium-filledenclosure. This paper describes the mechanical implementation of the beamabsorbers, with a focus on thermal design and analysis. In addition, thepotential for radiation-induced degradation of the graphite is discussed.

Mechanical Design of a High Energy Beam Absorber for the Advanced Superconducting Test Accelerator (ASTA) at Fermilab