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Re: TOF PMT Mounting was: Re: Design drawings
Hall D PID Mail List:
There is nothing sacrosanct about 6.000 cm - we could go to a comfortable
enough width to give us some wiggle room with little danger of
running into occupancy problems or degrading timing.
At 4:58 PM -0400 4/16/07, Matthew Shepherd wrote:
>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
>
>
>
>Content-Type: application/pdf;
> x-unix-mode=0644;
> name=Vd124k.pdf
>Content-Disposition: inline;
> filename=Vd124k.pdf
>
>Attachment converted: Macintosh HD:Vd124k 1.pdf (PDF /prvw) (001926CE)
>
>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.
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Alex R. Dzierba
Chancellor's Professor of Physics (Emeritus)
Department of Physics / Indiana U / Bloomington IN 47405 / 812-855-9421
JLab Visiting Fellow
Jefferson Lab / 12000 Jefferson Ave / Newport News, VA 23606 / 757-269-7577
Home Phone: 812-825-4063 Cell: 812-327-1881 Fax: 866-541-1263
http://dustbunny.physics.indiana.edu/~dzierba/
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~