[d2n-analysis-talk] Fwd: Pre Shower Dimensions

[Diana Parno]

FYI, Bogdan says that the long dimension of our shower/preshower  
blocks is 34 cm, which is slightly different from the values in our DB  
files.


Best,
Diana

Begin forwarded message:

> From: "Bogdan Wojtsekhowski" <bogdanw at jlab.org>
> Date: April 6, 2011 3:08:52 PM PDT
> To: "Gregg B. Franklin" <gbfranklin at cmu.edu>
> Cc: "Diana S Parno" <dseymour at andrew.cmu.edu>
> Subject: Re: Pre Shower Dimensions
>
> Hello Gregg,
>
> All blocks of lead-glass in the BigBite calorimeter have
> dimensions 8.5cm x8.5cm x34cm. The shower width
> is smaller (7x8.5 = 59.5cm) than the size of the two
> preshower blocks (68cm).
>
>> Hi Bogdan,
>>   We're trying to understand the preshower dimensions. Looking  
>> through
>> old Gen documentation, the blocks are listed as 35 cm long (as in
>> Seamus' thesis) and other places they are listed as 37 cm long.  The
>> Preshower is often shown as being 74 cm wide, so this appears to be
>> consistent with 37 cm in length.   I haven't found any drawings of  
>> the
>> light pipe, etc.   Is there a 2 cm discrepancy having to do with the
>> active area, etc?
>> Regards,
>> Gregg
>>
>> --
>> Prof. Gregg B Franklin
>> Head, Department of Physics
>> Carnegie Mellon University
>> phone: (412) 268-2743   fax: (412) 681-0648
>>
>
>
> -- 
> Bogdan Wojtsekhowski
> TJNAF, 757-269-7191
>
>