The initial location of the tagger microscope, which is listed above, is relative to the nominal focal plane. In these coordinates, a 0.300 GeV electron (Eγ = 11.700 GeV) crosses the nominal focal plane at x=0, y=0, z=0. The x coordinate increases along the focal plane towards the beam dump and y increases towards the magnet. The lower corner of the upper enclosure base-plate (lower electron energy corner nearest the magnet) is our reference point (see attached picture). The nominal position of the base-plate is parallel to the focal plane and level in the z-direction.
