[Halla12_software] unified PVDIS and SIDIS solenoid

[xqian]

Dear Paul,
     Thanks for the comments.
     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 
http://blinkin.krl.caltech.edu/transversity_11gev_pac35.pdf
     I attached the two poisson files. As you can see, the magnetic 
field in the detector region are not that different.
     1. babar_transv_3_3.am  (BABAR 1.5 m gap, in PAC34, we did not 
include the extra 1m in)
     2. CDF_transv_1.am  (CDF 2.5 m gap)

      Just let me know if I miss something here.

On 3/20/2011 6:28 PM, Paul E. Reimer wrote:
> Hello Everyone,
>
> 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.
>
> 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.
>
> Paul
>
> On 3/20/11 5:53 PM, xqian wrote:
>> Hi Zhiwen,
>>       Thanks for the effort.
>>       For SIDIS, we would need three more detectors, scintillator Heavy
>> gas Cerenkov and MRPC,
>>       Roughtly, 80 cm (HG) + 15 cm (MRPC) + 5 cm (Scintillator), taking
>> some extra room, I think 1.1-1.2 m more the requirement of PRVIS is
>> probably reasonable.
>>       Therefore, I would suggest to unify the design with 1.2 m more in
>> the endcap. The part close to the beam line (just under the detector)
>> will be limited by the SIDIS, as we require more forward angle.
>> Therefore, this also needs to be taken into account when we use the
>> unified design.
>>        Thanks a lot,
>>
>>
>> On 3/20/2011 11:51 AM, Zhiwen Zhao wrote:
>>> Hi, folks
>>>
>>> As we are trying to unify the yoke design for PVDIS and SIDIS, I have
>>> changed some geometry files in SVN and updated main database
>>> rename solid_BaBar_PVDIS_solenoid.pl to solid_BaBar_solenoid.pl
>>> rename solid_CDF_SIDIS_solenoid.pl to solid_CDF_solenoid.pl
>>> remove solid_BaBar_SIDIS_solenoid.pl
>>>
>>> Now we have solid_CDF_solenoid.pl and solid_BaBar_solenoid.pl match our
>>> field map and yoke design.
>>>
>>> SIDIS may need longer endcup, we shall evaluate it and modify design
>>> accordingly.
>>>
>>> Zhiwen
>>>
>>> _______________________________________________
>>> Halla12_software mailing list
>>> Halla12_software at jlab.org
>>> https://mailman.jlab.org/mailman/listinfo/halla12_software
>>
>
>
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-- 

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
-------------------------------------------------------

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