sPHENIX discussion of software

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

Also available on the agenda page: https://indico.bnl.gov/conferenceDisplay.py?confId=1175

 

Javier - Jet Objects

 

Page3 : If new jet algorithm is introduced, we can add them to the tags of jet&container

 

Page4:

Mike: the reason to use Jet* in JetMap is for versioning?

Jin: Yes.

 

Action Item [Javier]: Add working macro and example data file for people to follow and test

Action Item [Mike]: fast simulation capability; evaluator; add module and nodes to store truth jets and calorimeter jets.

 

 

Liang: Hcal light collection in simulation

 

Page3:

Jin: where the varying sampling faction number came from?

Liang: by tuning to smooth out variation of sampling fraction VS depth

 

Page6:

Liang: the lower side tail get improved after the light efficiency correction.

John: need to quantify the changes.

Action Item [Liang]: Add the reference sPHENIX EMCal to the simulation

Ed: laser etching of the tile cost is low

 

Page7:

Jin&Ed: Why reco energy is around 25GeV for 30GeV pion?

Liang: SF was calculated with E_scint/(E_scint + E_absorber) for hadron beams

Jin: Energy leakage VS reconstructed energy could be an interesting check

Xiaochun: The invisible energy was not included in the SF calculation, which count for the reconstructed energy is systematically lower than the input pion energy.

 

Action Item [HCal group]: develop quantitative performance matrixes to judge different versions of HCal

 

 

 

______________________________

 

Jin HUANG

 

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________

 

From: sphenix-software-l-bounces AT lists.bnl.gov [mailto:sphenix-software-l-bounces AT lists.bnl.gov] On Behalf Of Huang, Jin
Sent: Friday, May 22, 2015 12:24 PM
To: phenix-nextmid-l; sphenix-software-l AT lists.bnl.gov
Subject: [Sphenix-software-l] [reminder] Tue May 26 1-3PM sPHENIX simulation meetings @ 2-160

 

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

______________________________