sPHENIX HCal discussion

[Abhisek Sen <sen.abhisek AT gmail.com>]

Dear John and others,

     I let it run last night to generate some events with single particle. We could look into it today. Here are the locations:

/direct/phenix+scratch/abhisek/sPHENIX_workshop_files

There are three folders, "electrons", "muons" and "pions". I am out of quota after generating 10K pions, 10K muons and 5K electron files. They were generated with rapidity +/- 1, flat +/-10cm vertexz distribution. It has full inner, outer and emcal hits and towers.  If you want to see other configurations used to generate these files, macros can be found at 

/direct/phenix+hhj2/abhisek/sphenix/work/Fun4All_G4_sPHENIX_e.C

/direct/phenix+hhj2/abhisek/sphenix/work/Fun4All_G4_sPHENIX_mu.C

/direct/phenix+hhj2/abhisek/sphenix/work/Fun4All_G4_sPHENIX_pi.C

Cheers,

Abhisek

On Tue, Jul 28, 2015 at 9:03 PM, John Haggerty <haggerty AT bnl.gov> wrote:

Hello,

Jin, Nils, and Alan have put together an excellent forum for making forward progress on the simulation, and there are quite a few people interested in understanding the HCAL.  Fortunately, Chris and Jin have taken some important steps to make possible the next steps.  Chris was concerned about some off behavior with the azimuthal matscan, but with the help of the tutorials, I was able to see that the behavior comes from the EMCAL, and on closer examination, Jin found that this was due to precise channeling of geantinos down the fibers.  For real particles which multiple scattering, this is unlikely to be a problem, so the way is open to use the new geometry for the next round of studies.  I attached the depths in radiation lengths and absorption lengths from Chris's macro, where I had only one calorimeter section turned on at a time.

Standing around the blackboard with Sarah, Ron, Xiaochun, Chris, Jin, Abhisek and others, we thought the next step for the HCAL would be to run single particles (mu/e/pi/p) with a few thousand events per tower over 3 towers in phi in a few eta bins (like 0-0.1, 0.3-0.4, 0.6-0.7, 0.9-1.0) so we can do the next level of reality checking.  We concluded that we need events with the field on, and a vertex distributed in +/- 10 cm, and all three calorimeter compartments and the nominal tilt angle.

We think it would be possible to generate a similar sample with zero tilt angle, which would allow us to quantify the merits of the chosen tilt angle, although this is just a warm-up and basic check-out of the machinery, which will be exercised with jet reconstruction.

If you can't join us in person, please join us by email or phone over the next few days, we'll try and keep this list updated with our thinking.  I think you'll find the tutorials on the Indico web site as informative as I did, as well.

--
John Haggerty
email: haggerty AT bnl.gov
cell: 631 741 3358

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