sPHENIX discussion of software

["Huang, Jin" <jhuang AT bnl.gov>]

Minutes also available on agenda: https://indico.bnl.gov/conferenceDisplay.py?confId=2685

 

 

Software update - Chris Pinkenburg

 

Merged pull request: https://github.com/sPHENIX-Collaboration/coresoftware/pull/256

Major redesign PHG4Cell* objects. Verified with HIJING simulation and cylindrical tracking models. In additions, fixed stepping actions problem if particle decay in the active volume.

 

TODO: recovering silicon tracker's cell reconstruction class (done)

 

 

Announcement to active developers:

·       Rebase  development branches with git pull in both macro and coresoftware local repositories

·       Let Chris know if any question or concern

 

 

PHGenFit update - Haiwang Yu

 

Summary: Two ongoing work for next pattern recognition software suits.

 

1.       sPHENIX adoption of GenFit2: development to allow quick update of track state vector via reweighting.

2.       Seeding of progress tracking using HoughTransform on subset of inner layer silicon trackers.
Suggestions includes

o   Check quality of vector for the seeding

o   Check efficiency and purity of the seeds. Efficiency is important as it is the upper limit to the final tracking efficiency

 

Chris: we need to check pile up effect in p+p collisions and check how it affect the seeding.

Tony/Haiwang: important effect to check. Right now focusing on initial reconstruction of the progressive tracking patter reconstruction software.

 

 

INTT clustering issues - Tony Frawley

 

Summary: debugging a cluster position problem in INTT, which trace down to Stepping action interface of Geant4 for the silicon tracker

 

Suggest overlap check, 3-strip hits, and check PHG4SiliconTrackerSteppingAction::UserSteppingAction().

 

Jin volunteer to help debugging if useful.

 

 

TPC clustering - Carlos Perez.

 

Summary: TPC group is preparing next generation of software for TPC simulation.

 

Chris: current TPC use 40 cylindrical layers to segment Geant4 track into readout layers. Concern that edge effects by assigning hits into fixed layers. Suggest use a single volume in Geant4 and apply a step limit in Geant4 to segment the Geant4 track into steps. Drift and accumulate charge for each step.

Carlos: At this stage, plan to use the cylindrical geometry for now.

Summary: suggest keep this effect in mind, and make effort to move to single Geant4 volume following Chris' suggestion.

 

Carlos: for new TPC reconstruction, parameter and digitization classes, which repository path should they be added

Tony: suggest put the new class under simulation/g4simulation, and prepare in separate the reconstruction modules to offline/package later (after MAPS review and establish of new patter recognition software).

 

Tony: summary for organizational meeting for tracking software, https://indico.bnl.gov/conferenceDisplay.py?confId=2964

 

 

 

 

 

______________________________

 

Jin HUANG

 

Associate Physicist

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________

 

From: Huang, Jin
Sent: Monday, March 20, 2017 1:41 PM
To: 'sphenix-software-l AT lists.bnl.gov' <sphenix-software-l AT lists.bnl.gov>; 'sphenix-l AT lists.bnl.gov' <sphenix-l AT lists.bnl.gov>
Subject: [reminder] sPHENIX simulation and software meeting, Tue Mar 21, 1PM EST @ bluejeans

 

Hello everyone,

 

We will have a regular sPHENIX simulation and software meeting, Tue Mar 21, 1PM EST @ 2-219.

 

Currently on agenda is:

•         Major update on Cell object structure - Chris

•         Update on Kalman filter  - Haiwang

Further topics will be welcomed too  

 

The agenda page is at https://indico.bnl.gov/conferenceDisplay.py?confId=2685 , for which the common modification password is "1008"

•         For residents at BNL, we will meet at the 2-219 conference room if not closed for snow

•         To join the Meeting via phone bridge:  https://bluejeans.com/619960505 

•         To join via Phone:

1) Dial:

        +1.408.740.7256

        +1.888.240.2560(US Toll Free)

        +1.408.317.9253(Alternate number)

        (see all numbers - http://bluejeans.com/numbers)

2) Enter Conference ID: 619960505

 

Cheers,

 

Jin

 

 

______________________________

 

Jin HUANG

 

Associate Physicist

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________