Re: Lead glass blocks

[gen (Eugene Chudakov) <gen@jlab.org>]

My two cents...

Tim,

lead tungstanate is a very different thing. It makes a scintillating 
crystal (not glass), which light yield 
depends on temperature significantly. In contrast, a lead glass detector
produces only the Cherenkov light, which does not depend on temperature.

Eugene

>Hi Matt,
>
>I spoke with Dave Kashy about the Hall B primex lead glass calorimeter. 
>They used lead-tungsten glass and it had to be cooled in order to 
>perform properly. Do we require any cooling for ours taking into 
>consideration the type of material we will use for the rad hard inner 
>layers?
>
>Thanks,
>
>       Tim
>
>