TOF PMT Mounting was: Re: Design drawings

[Matthew Shepherd <mashephe@indiana.edu>]

Hi Alex and Tim,

I'm attaching a mechanical drawing for the VD124K bases that we plan  
to use in the TOF.  You can see that the socket seems to have 56.5 mm  
diameter.  With a 60 mm bar width, this leaves 3.5 mm between bases  
in an "inline design" -- tight.  Also there is a "loose flange" that  
would definitely interfere in an inline design, but maybe could be  
removed from the base.

Some of the same challenges with FCAL are present here.  We need a  
design that allows replacement of tubes.  The big plus here is that  
we have almost 20 times fewer channels to deal with.

-Matt

Vd124k.pdf

On Apr 13, 2007, at 2:45 PM, Alex Dzierba wrote:

> Tim and I just talked.  Before we did I found the attached drawing
> by Eric that shows a tapered scintillator bar that has an active
> length of 2 m, a width of 6 cm and a thickness of 2.54 cm.  The
> ends are tapered to accommodate the XP2020 (2-in diameter)
> and shielding.  Note Eric's units are inches.   The difference
> now is to have a 2.52 m active length.  The two-wall structure
> has a 12 cm x 12 cm hole with the center bars being less than
> half-bars with readout at only one end for these bars.