Quick Shot

This 2-mm-diam “anti-target” was shot in the thru-tank calorimetry campaign in January 2016. The target consisted of a copper disk with a 2-mm aperture to allow focused UV beams pass through the “anti-target” to the calorimeters mounted on the opposite ports of the target chamber. The large plastic shield attached to the copper disk was originally aluminum-coated to be opaque and block any unfocused residual red and green light from reaching the opposite port.