sPHENIX is a new detector at RHIC.

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

Dear All,

 

Due to the on-going QM’15, we will cancel the simulation meeting today. Let’s resume next week, with updates from subsystem groups on pre-CDR studies. Email discussion are welcomed too.

 

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, September 22, 2015 3:15 PM
To: 'sphenix-l AT lists.bnl.gov' <sphenix-l AT lists.bnl.gov>; 'sphenix-software-l AT lists.bnl.gov' <sphenix-software-l AT lists.bnl.gov>
Subject: [minutes] sPHENIX simulation meetings, Tue Sept 22, 1-3PM @ 3-192

 

Also available on agenda : https://indico.bnl.gov/conferenceDisplay.py?confId=1340

 

Production – Chris Pinkenburg

 

On-going forth batch of the pre-CDR production:

·       1k single particle simulation in ref. detector

·       100k event for electron ID focused event (2/4/8 GeV e+/-, hadron) and w/ and w/o silicon detector

·       HCal tilt angle scan

·       HIJING events, with tilt angle scan too

·       Pythia8 200GeV pp MB events for trigger study

TODOs:

·       Hijing embedding single particle events, as requested by Jin

·       Run higher amount of single particle simulation to better quantify tail behavior in HCal, as requested by John L.

Limitation:

·       Main limitation is from the available condor high memory CPU slots.

 

John L.: where is the output

Chris: Will send around output as production finishes. Expect output here : /gpfs02/phenix/prod/sPHENIX/preCDR/pro.1-beta.5/

 

Megan: tilt angle with 4 crossing produce 26 degrees tilt angle?

Chris: 32 degree is one reference angle. The current algorithm in HCal code should be correct which produce about 31 degree tilt angle, depending how the angle is measured. The configuration is better defined with crossing number, rather than tilt angle.

 

John L.: run 2k single particle simulation is better for tail studies

Chris: will run ~5k. Exact number will be determined later according to condor limits.

 

 

Analysis software – Mike McCumber

 

Done:

·       JetEval Seg fault fix, associated with the excluded jet particles

·       PHG4Field added with a scale factor

·       PHPythia8 non-harming error message removed

·       CaloEval optimizing: detective work on improving speed by x10. Pull request pending introducing cut-off limits.

·       Tracking interface function update for DST output

TODO:

·       Eval crash issue.

·       Kalman fitter with experience of Bell II Geant4e

·       Rave module

·       Adding feature to the tracking code and modularization of tracking code.

 

Partial evaluation speed:

Jin: It takes long time to fully evaluate a HIJING event (~10min). But how about the time cost for only evaluate selected particle in Hijing events (e.g. only look at embedded photons)?

Mike: about 10s seconds, limited by random access of truth table.

 

Further improving speed:

Chris: We can speed up by removing all absorber particle from the truth table

Jin/Chris: Need to propagate the tagging to SteppingAction, to tag Geant4 hits with usefulness.

Mike: Deserve a try

 

Alan’s Pull request #51:

Mike: still have large memory usage issue?

Alan: Need tweak PHG4hough to get around. Introducing a flag to preserve older behavior is a good way to go.

 

TPC setup:

Ron: Problem on swapping gas type?

Alan: need to be careful on the macro setup.

Ron: TODO item test 3rd layer of silicon with TPC

 

 

HCal simulation - John Lajoie

 

Page 3:

Jin: is the radial dependent light_yield suppression enabled?

John L./Chris: disabled in current production.

 

Page 5:

Jin: If group hits in radius bin and plot sampling fraction VS radius of the hit, then we should reproduce the radius dependency of sampling fraction from single estimations, and use that to guild and verify tile grading choices.

John L. : agree.

  

Page 9:

John L./John H.: expect two source contribution to the energy dependence of the high side tail, 1) geometry of channeling through scintillator. 2) varying e/h for different energy.

 

Page 11, two more comments:

Jin: smaller tilt angle would lead to higher channeling pT. If the geometric channeling were the leading cause of the high-side tail, then similar study on tilt scan data would show higher high side tail at higher pT, which affect physics performance of jet unfolding on log-dropping spectrum.

Jin: Abhisek and I have introduced digitalization of HCal in a private fork for testing: https://github.com/blackcathj/macros/tree/TowerCalib , which should bring resolution number more close to reality with zero-suppression and photon fluctuation.

 

 

 

 

 

 

______________________________

 

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: Monday, September 21, 2015 12:06 PM
To: 'sphenix-l AT lists.bnl.gov' <sphenix-l AT lists.bnl.gov>; 'sphenix-software-l AT lists.bnl.gov' <sphenix-software-l AT lists.bnl.gov>
Subject: [reminder] sPHENIX simulation meetings, Tue Sept 22, 1-3PM @ 3-192

 

Dear All,

 

Although Quark Matter is coming, we will still try to have our next weekly sPHENIX simulation meeting Tue Sept 22, 1-3PM @ 3-192.

 

A new batch of production is coming that allows HCal tilt angle scan and enhances the sampling fraction for the fully projective SPACAL. The first draft of pre-CDR was also put together and linked to the agenda. In this meeting, we will focus on analyzing the production data and preparation towards the final pre-CDR. More contributions are welcomed too.

 

The agenda page is at https://indico.bnl.gov/conferenceDisplay.py?confId=1340 , for which the modification password is 1008

·       For residents at BNL, we will meet in the 3-192 conference room.

·       To join the Meeting via bluejeans: https://bluejeans.com/468481110

·       To join via Phone:

1) Dial:

        +1 408 740 7256

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2) Enter Conference ID: 468481110

 

Cheers,

 

Jin

 

 

______________________________

 

Jin HUANG

 

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________