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

[Daniel Sober]

I *almost* agree with Richard's interpretation.  I think it is important 
to measure at least a limited map at 2 extreme excitations (say 0.9 and 
1.7 Tesla) and check (promptly) that the actual saturation effects are 
consistent with the Tosca predictions -- leaving open the possibility of 
more extensive mapping if we find significant differences.
Dan


On 8/14/2013 5:53 PM, Richard Jones wrote:
> 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
>     <http://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 
> <mailto: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 <tel:%28202%29%20319-5856>, -5315
>     E-mail: sober at cua.edu <mailto:sober at cua.edu>/
>
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