[Clas_offline] Bug in CLAS-6 MC ST reconstruction (C++ code only)

[Michael C. Kunkel]

Greetings,

I am not sure if what I am going to say applies to your email, but for 
my simulations, I copy the values of the ST, DC and SC from the 
calibration run into run 10 and then solely simulate with run 10. I have 
never had incorrect timing with this method (+- 0.05 ns difference 
between MC and Data). The reason I do not copy all the calibration run 
into run 10 is because GSIM needs the values for the CC and EC to be of 
the original run 10.

I hope this helps.

BR
MK


On 4/11/14 3:51 PM, Paul Mattione wrote:
> I've found a bug in the C++ version of the new start counter reconstruction code for CLAS-6.  It only effects reconstruction of Monte Carlo data: ST hits are being reconstructed using the calibration constants from the run number in the HEAD bank rather than run number 1 (resulting in hit times that were off by ~700 ns).
>
> I modified my personal reconstruction code to use separate run #'s for the ST geometry and calibration constants, but reconstruction crashes because no calibration constants have ever been defined for runs 1-10 for some of the constants that are only needed by the C++ reconstruction code (e.g. STN_CALIB / adc2edep / reg1limit, needed by SThit::GetEnergyDeposit() in st/stpp_SThit.cc).
>
> Could someone with advanced knowledge of the start counter simulation and reconstruction codes set the missing calibration constants for runs 1-10?
>
> Until this is fixed, I recommend running your Monte Carlo simulations using the Fortran reconstruction code ("set st_type 1;" in your tcl file).
>
>   - Paul
>
> FOR DEVELOPERS:
>
> My code modifications to use separate run #'s for the ST geometry and calibration constants can be found on ifarm1102 at (note that this is g13-era svn/scons software, so a straight copy may break your build):
>
> Code: /w/hallb/clasg13/pmatt/svnroot_clas6/g13a_pass2v2_64bit/trunk/
> Environment Variables: /home/pmatt/env_jlab_clas6_mccook_centos62
>
> In this trunk, I made small modifications to the following files:
>
> detector/st/stpp_JCalibration.*
> detector/st/st_brun.F
> detector/st/stpp_initialize.cc
> detector/st/stpp_STposition.*
> calibration/tag_calib/tagraw.cxx
>
> If you want to test using your own source code, I recommend diff'ing these files with your current source code and only copying the changes that look related to this issue.  Thank you for helping with this.
>
>
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