The RICH prototype has taken data on cosmic rays. We obtained approximately 13.5 photoelectrons per Cherenkov Ring. The results are documented in Sacha Kopp's IEEE talk on RICH prototype results.
Several pictures of the prototype are shown below:
Setup of protytpe under two sets of drift chambers
Examples of photon pad hits with projected track image patterns (postscript).
View through the CaF2 windows of the pads.
The end of the wire frame, showing the 20 micron wires.
View of the hybrid cards on the backside of the chamber holding
the Viking VA2 electronics chips.
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