Re: question on pair spectrometer shielding

[Richard Jones <richard.t.jones@uconn.edu>]

Alex,

The iron will completely change the field, won't it?  Then it makes no 
sense to move it, map it, and then put it back.  We might as well not 
map it!  The magnetic forces will be big, maybe bigger than the weight 
for some blocks. 
> - There is enough space after the chamber in the case
> we decide to unscrew it and move aside to map the field
> (we could probably make inserts in the chamber to measure
> the field) 
-Richard J.


Alexander Somov wrote:
> Richard,
>
> I don't understand completely your concerns:
> - There is enough space after the chamber in the case
> we decide to unscrew it and move aside to map the field
> (we could probably make inserts in the chamber to measure
> the field)
> - The platform can hold heavier objects, should not be an
> issue (the platform support should be beneath the blocks)
>
> We can replace cheap iron blocks with a band of lead bricks;
> (we will need  ~20/30 radiation lengths of shileding anyway).
> that is what we were thinking of doing originally.
> Let's discuss it during the meeting.
>
> Alex
>
>