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Dear Paul, <br>
Thanks for the comments.<br>
During PAC 35, when I tried to calculate the Magnetic field of
SoLID, I place about 2.5 m in the endcap, see Fig. 8 of
<a class="moz-txt-link-freetext" href="http://blinkin.krl.caltech.edu/transversity_11gev_pac35.pdf">http://blinkin.krl.caltech.edu/transversity_11gev_pac35.pdf</a><br>
I attached the two poisson files. As you can see, the magnetic
field in the detector region are not that different. <br>
1. babar_transv_3_3.am (BABAR 1.5 m gap, in PAC34, we did not
include the extra 1m in)<br>
2. CDF_transv_1.am (CDF 2.5 m gap)<br>
<br>
Just let me know if I miss something here. <br>
<br>
On 3/20/2011 6:28 PM, Paul E. Reimer wrote:
<blockquote cite="mid:4D86A9A5.4070802@anl.gov" type="cite">Hello
Everyone,
<br>
<br>
While the configuration can change somewhat, I'm not sure that
thing are that flexible, not just in terms of what detectors PVDIS
and SIDIS want, but the more practical point of whether this is
something we can build. When I look at Eugene's original BaBar
design, there were approximately 1.6 m of space for detectors
between the coils upstream pole tip and the large flux return.
This can change somewhat, but not by a factor of two. I base this
comment on consideration of the flux return and the additional
energy that is needed to make that larger. In terms of the angle
of the "nose cone"--the consideration here is how to minimize the
field in the detector region. Some of the flux will immediately
go up and back through the upstream pole, but the rest needs to
find iron somewhere, and this is provided by this area.
<br>
<br>
We should talk in person about this. I'm going to be at the SoLID
meeting this Friday. (I get in around midnight on Thursday.) On
Sat. and Sun. I have day shifts in Hall A, so we could talk then
if we need to and if the experiment is going well.
<br>
<br>
Paul
<br>
<br>
On 3/20/11 5:53 PM, xqian wrote:
<br>
<blockquote type="cite">Hi Zhiwen,
<br>
Thanks for the effort.
<br>
For SIDIS, we would need three more detectors,
scintillator Heavy
<br>
gas Cerenkov and MRPC,
<br>
Roughtly, 80 cm (HG) + 15 cm (MRPC) + 5 cm (Scintillator),
taking
<br>
some extra room, I think 1.1-1.2 m more the requirement of PRVIS
is
<br>
probably reasonable.
<br>
Therefore, I would suggest to unify the design with 1.2 m
more in
<br>
the endcap. The part close to the beam line (just under the
detector)
<br>
will be limited by the SIDIS, as we require more forward angle.
<br>
Therefore, this also needs to be taken into account when we use
the
<br>
unified design.
<br>
Thanks a lot,
<br>
<br>
<br>
On 3/20/2011 11:51 AM, Zhiwen Zhao wrote:
<br>
<blockquote type="cite">Hi, folks
<br>
<br>
As we are trying to unify the yoke design for PVDIS and SIDIS,
I have
<br>
changed some geometry files in SVN and updated main database
<br>
rename solid_BaBar_PVDIS_solenoid.pl to
solid_BaBar_solenoid.pl
<br>
rename solid_CDF_SIDIS_solenoid.pl to solid_CDF_solenoid.pl
<br>
remove solid_BaBar_SIDIS_solenoid.pl
<br>
<br>
Now we have solid_CDF_solenoid.pl and solid_BaBar_solenoid.pl
match our
<br>
field map and yoke design.
<br>
<br>
SIDIS may need longer endcup, we shall evaluate it and modify
design
<br>
accordingly.
<br>
<br>
Zhiwen
<br>
<br>
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</blockquote>
<br>
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<pre class="moz-signature" cols="72">--
Best regards,
Xin
-------------------------------------------------------
Dr. Xin Qian
Postdoctoral Scholar @ Kellogg Radiation Lab of Caltech
Phone: 1-626-395-4267 (o)
MS 106-38 Caltech, 1200 East California Blvd,
Pasadena, California, 91125
skypename: lastgeorge
-------------------------------------------------------</pre>
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