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Re: question to material in geometry

Hi Elke,

A quick calculation shows a wall thickness of 4mm  steel (the entire 45cm length) needed to keep deflections down below 100 microns.This is assuming a 2mm thick round tube inside a 2mm thick square tube. This will need to be made special. Some other design using rohacel machined flat and glued to a thin walled smaller tube may be possible.The rohacel would be muck thicker, but may buy us something.

Tim

Elke-Caroline Aschenauer wrote: 
On Mon, 21 Jan 2008, Richard Jones wrote:

Dear Richard,

thanks for the answer. I think the best would be to put the material Tim
is intending to put to support the lead glas blocks. Tim some rough
numbers please?

Thanks elke


  
Date: Mon, 21 Jan 2008 11:14:37 -0500
From: Richard Jones <richard.t.jones@uconn.edu>
To: Elke-Caroline Aschenauer <elke@jlab.org>,
     Matthew Shepherd <mashephe@indiana.edu>
Cc: halld-mc@jlab.org
Subject: Re: question to material in geometry

Elke,

There is currently no support material to hold the FCal blocks around
the beam hole.  I propose to add an iron sleeve of  a new mm thickness.
Matt, do you have a recommended thickness for that?

Adding a helium bag down the beam line after the target is a good idea.
I have it on my to-do list.

Richard Jones


Elke-Caroline Aschenauer wrote:
    
Dear Richard,

I have a small question to the material in the geometry file.

For the FCal beam hole do you have any material in there. Of course I mean not completely filled but some frame/tube is needed to support the blocks.

One other question on the performance with the detector is if we would put a helium bag going from the end of the FDC through the empty cerenkov space to the tof, through the fcal to the photon beam dump.

I can add this 2 items concerning geom-file on the wiki.

cheers elke



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