[Clas12_software] dc region 2 corrected position

[Mac Mestayer]

Hello all;

Just to be clear: this geometry change is for all regions.  It is
just larger in reg.2.    - Mac

----- Original Message -----
From: "Raffaella De Vita" <devita at ge.infn.it>
To: "clas12 software" <clas12_software at jlab.org>
Sent: Sunday, July 1, 2018 9:50:47 AM
Subject: Re: [Clas12_software] dc region 2 corrected position

Hi All,
Region 2 geometry in the CCDB default variation has just been updated.
Best regards,
     Raffaella

Raffaella De Vita wrote:
> Hi All,
> as discussed at the software meeting yesterday, a study was performed
> to compare tracking results based on the DC region2 positions we have
> in CCDB default variation (based on the original drawings) and
> corrected position presently available in a variation that were based
> on the estimated position after installation. Since the effect of the
> change is significant and seems to be shifting both the elastic peak
> at 6 GeV and the z vertex toward the expected values, it was decided
> to update the CCDB default variation with the corrected numbers. These
> constants will be loaded only for the run range corresponding to real
> data, leaving the MC runs unchanged for compatibility with the gemc
> geometry.
> Unless there are objections, geometry in CCDB will be updated tomorrow.
> Best regards,
>     Raffaella

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