Abstract
We have made a transparent electromagnetic shower absorber, sandwiching together lead glass and scintillator sheets. The energy resolution we achieve is as good as expected for a sampling calorimeter with the passive layer thickness adopted, and the signal produced is about ten times larger than the signal from the Cherenkov radiation in the lead glass. We show that this makes possible the use of vacuum photodiodes with a noise level of the order of 40 MeV, and such a counter could therefore be operated in a magnetic field. Finally, we propose and discuss possible schemes for the production of large systems, arguing that the cost per counter would be significantly lower than an equivalent lead glass counter.
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