Pictures of the upstream Al dummies (1%, 4% and 2%RL), lh2 target cell beam exit window and beam entrance window. The browning spots are caused by the beam, except for the cell entrance window, which is clean as a whistle!
The downstream Al dummies have the same spots but are much less visible than on the upstream Al dummies.
All of these targets seem to have been well aligned in beam.
Upstream Al dummies
LH2 cell exit window
LH2 cell entrance window
