[Halld-tagger] New version of tagger dipole raytracing report

[Richard Jones]

Hello all,

I have posted what I think will be the final draft of Dan's raytracing
study through the tagger magnet.  Based on these studies, it seems that
mapping the field at any other than the nominal excitation will not be
necessary.  In addition to the regular grid within a region centered on the
magnetic poles, Dan recommends that zones around the beam entrance and exit
regions, and also along the far edge of the pole, be measured with extended
scans.  Please see the updated documents on the wiki for details.

   1. go to "photon beam" (right menu on the main page of wiki.gluex.org)
   2. go to "tagger" (right menu item near the top)
   3. to to "plan for mapping the tagger magnet"
   4. see the top two links and the accompanying figure on this page.

We will discuss these results at the next beamline meeting, but basically
the mapping requirements are less demanding than we had earlier imagined.

-Richard J.



On Wed, Aug 14, 2013 at 3:46 PM, Daniel Sober <sober at cua.edu> wrote:

>  I think I have finally solved the Tosca coordinate system problem, which
> allowed me to make a more meaningful comparison with the "standard rays"
> used in layout work.  The results are now in Section 3 of the updated
> version of the report, posted at the same location as previously:
>
> http://faculty.cua.edu/sober/HallD/Raytracing_studies.pdf<http://faculty.cua.edu/sober/HallD/raytracing_studies.pdf>.
>
> --
> *Daniel Sober
> Professor
> Physics Department
> The Catholic University of America
> Washington, DC 20064
> Phone: (202) 319-5856, -5315
> E-mail: sober at cua.edu*
>
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