sPHENIX discussion of software

[lxue <lxue AT rcf.rhic.bnl.gov>]

Hi Jin,

I would like to present light correction study for HCal this afternoon if we have time.

Thanks

Liang

On May 22, 2015, at 12:23 PM, Huang, Jin <jhuang AT bnl.gov> wrote:

Dear All,

 

This is reminder that our weekly sPHENIX simulation meeting Tue May 26 1-3PM. For residents at BNL, we will meet in the 2-160 conference room.

 

For the next meeting, Javier will tell us his development on the Flow Jet analysis module and first try of jet objects in the new sPHENIX universe. New topics are welcomed too.

 

The agenda is 

https://indico.bnl.gov/conferenceDisplay.py?confId=1175

The modification password is 1008

To join via Browser:
https://bluejeans.com/377457648/browser 

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: 377457648

 

Cheers,

 

Jin

 

 

______________________________

 

Jin HUANG

 

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________

 

From: Huang, Jin 
Sent: Tuesday, May 19, 2015 3:06 PM
To: phenix-nextmid-l; 'sphenix-software-l AT lists.bnl.gov'
Cc: 'sphenix-hcal-l AT lists.bnl.gov'
Subject: [minutes] Tue 1-3PM sPHENIX simulation meetings in HCal workfest week

 

Also available on agenda: https://indico.bnl.gov/conferenceDisplay.py?confId=1162

 

Announcement:

We use new time slot and room for future sPHENIX simulation meeting:

Tue 1-3 PM at 510-2-160 Conference Room by default

 

John L. - HCal simulation thoughts

 

Summary: nice overview on possible path forward on HCal simulation 

 

Page4:

Ed: digitalized form important to extract Time-of-Flight

Jin:

1.       We have a simple HCal tower class, and John's plan give great overview of functionality we want to include

2.       Some correction need to be done in the

 

Page 8:

We agree that we should move forward on adopting a policy on organizing GitHub code development with larger group of people. Code reivew and sign-off procedure need to be defined. 

 

Action Item [Martin and John L.]: make tutorials on policy management from other GitHub projects, so we can learn and adopts

 

Liang - Simulation summary

 

Summary: for the current considerations on the Hcal simulation analysis

 

Jin- Production considerations

 

Summary: some thinking on organizing formal productions.

 

An existing code doing simple HCal towering: 

1.       Start with macros/g4simulations/G4_HcalOut_ref.C
https://github.com/sPHENIX-Collaboration/macros/blob/master/macros/g4simulations/G4_HcalOut_ref.C

2.       PHG4HcalCellReco group PHG4Hits together to make Cells (collection of G4hits within a set of scintillation tile)

3.       RawTowerBuilder convert PHG4HcalCellReco into tower objects.

4.       RawTowerBuilder save RawTowerContainer onto the DST nodes, which contains a set of active tower in one event

5.       Each tower is described by RawTowerv1 , which currently contains the eta + phi bins and G4 total energy deposition

We probably want to make a new tower object which know its location + G4 total energy deposition + visible energy deposition for the short term HCal studies. 

 

Birk's law code implementation for EMCal:

1.       EMCal stepping function calls for visible energy calculated for each Geant4 tracking step:
https://www.phenix.bnl.gov/WWW/offline/doxygen_sPHENIX/html/d8/dcf/PHG4SteppingAction_8cc_source.html#l00088

double light_yield = GetVisibleEnergyDeposition(aStep);

2.       PHG4SteppingAction::GetVisibleEnergyDeposition use the standard Geant4 G4EmSaturation module to convert Geant4 ionization energy loss to visible energy with Birk's law correction based on G4 standard Birk constant list.

3.       Then for SPACAL PHG4SpacalSteppingAction::UserSteppingAction() , three energy is tracked and saved to the output PHG4Hitv6 (then later used for towering): 

a.       hit->set_edep(...) save total Geant4 truth energy deposition

b.      hit->set_eion(...) save Geant4 ionization energy deposition

c.       hit->set_light_yield(...) save visible energy which is ionization energy deposition x Birk's law correction

We probably want to implement similar thing in PHG4HcalSteppingAction::UserSteppingAction()

 

 

______________________________

 

Jin HUANG

 

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________

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