The electromagnetic calorimeter uses lead-tungstate crystals that were
developed for CMS. The crystals produce scintillation light that is
very fast; more than 99% of the light is emitted in 100 ns.
The approximate dimensions are 2.7 cm x 2.7 cm x 22 cm.
These crystals are radiation hard and produce ~10
photo-electrons per MeV into a 1" diameter photomultiplier tube. Our calorimeter
will use photomultiplier tubes with quartz windows to prevent radiation damage.
The readout will be via a modified
"QIE" chip originally developed by Fermilab for the KTeV experiment.
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Lead Tungstate Crystals
We require a radiation hard tube with a quartz window and 5-7 amplification
Suitable phototubes are currently produced by several manufacturers:
and Huadong Electronics.
Crystals for test beam runs at Protvino were purchased in Russia
Data from the first run in April 2001, used to set up the beam line and equipment
are being analyzed. The full data run will be in Novemeber 2001. A preliminary
plot shows good energy resolution (0.6%) for 40 GeV incident electrons.
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This page last updated: Friday, 26-Jul-2002 14:48:53 CDT