[Halla12_software] unified PVDIS and SIDIS solenoid

[Paul E. Reimer]

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
>>
>> _______________________________________________
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>

-- 
Paul E. Reimer, Physicist   +1-630-252-4037 (office)
Physics Division, Bldg 203  +1-630-252-3903 (fax)
9700 S. Cass Ave.           +1-630-840-5708 (Fermilab)
Argonne, IL  60439          reimer at anl.gov
USA                         www.phy.anl.gov/mep/staff/Reimer_P_E.html

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