  One of the goals of the PXIE program at Fermilab is to demonstrate the
capability to form an arbitrary bunch pattern from an initially CW 162.5 MHz H-
bunch train coming out of an RFQ. The bunch-by-bunch selection will take place
in the 2.1 MeV Medium Energy Beam Transport (MEBT) by directing the undesired
bunches onto an absorber that needs to withstand a beam power of up to 21 kW,
focused onto a spot with a ~2 mm rms radius. Two prototypes of the absorber
were manufactured from molybdenum alloy TZM and tested with a 28 keV DC
electron beam up to the peak surface power density required for PXIE, 17W/mm2.
Temperatures and flow parameters were measured and compared to analysis. This
paper describes the absorber prototypes and key testing results.
