Beam-Beam geometry

From: Yury Blyakhman (Yury_B@physics.nyu.edu)
Date: Tue Sep 12 2000 - 16:13:46 EDT

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        Hi, Michael and everybody.
      I've received several requests already about the Beam-Beam Counters geometry. So, I decided to post this information on the list server.
      Some of it, such as pictures of the detectors and numbering scheme, can be found on the BB web page at:

         http://www.rhic.bnl.gov/brahms/WWW/private/detectors/beam/

     As for the other numbers, here's the copy of the message I sent yesterday to JJG:

    >     Hello, Jens Jorgen.
    >  As for the Beam-Beam Numbers, it is very simple to get them. I have a very > small macro on the pii machines : /home/beam/dNdEta/Macros/Eta.C
    > I has all numbers you're asking for. It also has all necessary comments, so > it shouldn't be a problem for you to figure out what is what. You just have > to copy it in the directory, where you're starting root and load it via :
    >
    > root[0] .L Eta.C
    >
    > It has all physical numbers loaded and it has a few functions for Eta
    > identification, depending on the array, module and vertex location.
    >

      I use it and change it all the time, so you might need to clean it up a little bit, if you want to use it directly. But all numbers are claimed to be "const", they don't change.
      Thanks,

    -- 
            Yury Blyakhman.
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