[Rich] GEMS Alignment

[mirazita]

Hi Rachel,
have a look at the pdf, I took the distances from Dario's drawings. 
The distance of the GEM0 from the RICH is taken from the external face of
the box.
Ciao,
    Marco

On Thu, 27 Sep 2012 15:39:33 +0100, Rachel Montgomery
<r.montgomery.glasgow at gmail.com> wrote:
> Hi Marco,
> 
> We are starting to work on the GEMS, but the first step is alignment. 
> The idea is  to use the pmt-on-beam runs to help align the gems. But for

> this I am going through the log book just now to find the measurements. 
> In the beam line direction I basically need the position of each gem and

> the pmts.
> 
> Where the gem positions are written - it has distances from eg:
> RICH <->    GEM0 <->    GEM1 <->    chambers
> Is RICH the front edge of the black box? Because I have similar 
> measurements written too in my lab book where I measured to the front of

> the black box for the RICH. Do you know the distance of RAD1 in the 
> black box of the rich from the front of the RICH box? And can I take the

> positions for RAD1 and RAD2 from here eg:
> http://clasweb.jlab.org/wiki/images/8/82/Mirazita_rich_2012_09_07.pdf
> The measurements there are in mm.
> 
> Many thanks in advance for any help, Rachel
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