sPHENIX is a new detector at RHIC.

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

Also available on agenda: https://indico.bnl.gov/conferenceDisplay.py?confId=1337

 

Chris Pinkenburg : simulation production

 

Trying 3rd iteration of single particle production (allow use realistic SPACAL tower in analysis stage). Hijing still have condor issue. Working on it.  

https://github.com/sPHENIX-Collaboration/coresoftware/releases/tag/pro.1-beta.3

 

Jin: as Hijing data coming, there would be a more emergent need of embedding single particle simulated data into HIJING (currently we can only do embedding by running the simulated of signal particle).

Chris: agree. Need to take over hit ID on PHG4hit, truth particle container (particle and vertex) and update the association.

Action Item [Jin] : check into the details and propose a module to do so.

 

 

Mike McCumber : vertex analysis scheme

 

Requested merge the vertex development branch. Added G4 vertex folder/lib. Add following two tiers of vertex objects:

·       BBC fast sim vertex

·       Global vertex

Pull request available for comments:

https://github.com/sPHENIX-Collaboration/coresoftware/pull/30

 

Jin: shall we use the average beam position or 0 cm location for BBC X/Y in the global vertex?

Action Item [Mike]: add beam X-Y to BBC generated global vertex. (offline discussion: also add a SIM vertex with 3D smearing on X/Y/Z)

 

Chris: would we need a new branch for timing, rather than tagging on vertex for timing?

Jin: With a fully implemented TOF detector (as one option for ePHENIX), we would be able to tag different time of each vertex down to precession of <10 ps.

Consensus: keep the time tag on vertex for future use.

 

Chris: displaced/secondary vertex would be needed in the future.

Mike: on TODO list, pre-CDR

 

 

Mike McCumber : update on evaluator

 

A new tier of object to decode truth information for evaluation use. Merged to master through pull request:

https://github.com/sPHENIX-Collaboration/coresoftware/pull/27

 

Example to use of the objects in user code would be the generic evaluator ntuple maker:

https://www.phenix.bnl.gov/WWW/offline/doxygen_sPHENIX/html/dd/d59/classCaloEvaluator.html

 

 

Jin: Following mike's point on performance check, it would be useful tool to check build/performance for each pull request, to help making decision on merging pull requests.

Martin: From past projects, another useful way to check compatibility of pull requests would be a daily merging of all pull request into an incoming branch and check its build.

 

Action Item [Jin/Martin/Chris]: further develop the pull-request-QA concept offline and try to implement one for sPHENIX (discussion started after meeting).

 

 

Jin Huang: EMCal updates

 

 

Page 9: three pre-CDR clusterizer concept was discussed.

 

Ideal clusterizer:

Megan Connors: circle around track may be too artificial in pattern recognition performance.

Jin: also good baseline.

 

FastJet as EMCal clusterizer:

Rosi Reed (from EMCal meeting on Mon): FastJet require circular shape, would not work well for elliptical clusters.

Mike : expect poor performance on spliting clusters with Anti-KT

Megan/Jin: we can also try kT and Guass filter algorithm under FastJet too.

 

 

Ed/Chris: update the pre-CDR plot list with names.

 

Action Item [Jin]: Update the slides with the EMCal plot list with names assigned (done).

Action Item [John L.] : plan to send around the Hcal plot list

 

 

Ron: TPC update

 

Page 2:

Tony: add another intermediate layer silicon detector?

Ron: Will be good to study

 

Page 5:

Tony: real decider for the inner radius limit could be the pattern recognition. 500 HIJING might tell us that. 

Ron: study in progress. (see next slides)

 

Page 6:

Ed: E field requirement would strongly affect cage design, which is a challenging task. Guidance from gas choice/simulation study would be helpful.

Ron: Ne/CF4 require higher voltage. Need volunteer for gas simulation comparisons.

 

Volunteer Needed : TPC simulation studies (contact Ron)

Jin: Purity vs multiplicity would be needed for Hijing too

Ron: agree.

 

Action Item [Tony/Ron]: update the overleaf pre-CDR document with list of plots planned.

 

 

Alan: TPC simulation setup (discussed in the last meeting too)

 

Page 3:

Ed: Is the ILC TPC the one Klaus worked on?

Alan: Yes.

Ed: Where is the detector?

Alan: somewhere Japan. Similar in dimension to sPHENIX need, very nice reference for us.

 

Jin: was drift time/Z semaring simulated?

Alan: current use a mock-up Gauss searing. Pulse fit needed for future.

Ed: not a priority for pre-CDR

Jin: Then how merge of tracks in Z/time dimension gets handled?

Alan: handled in merge track hits of the same timing bins.

 

Page 7:

Alan: What would be the strategy in merging software to handle needs of both TPC and SVX?

Mike: deal with six configuration macro for now. Good to merge the C++ module later.

 

 

Tracking in general:

 

Tony: Will have a post doc at RIKEN to join the tracking simulation study too.

 

Ron: coordination between different tracking configuration studies.

Mike: should avoid many switching flags, which will be confusing to users. We already pushed subsystem -> separate macros, which leave a clean interface to users. 

Tony: split into the tracking macros into the inner/outer tracker macros parts.

Mike: as the interface to non-tracking experts, still tracking experts should support one tracker.C , which load the inner and outer tracker macro.

Tony: will do so and follow up with Mike offline.

 

Action Item [Tony/Mike]: implement the tracker macros which support six standard configurations for pre-CDR stage.

 

 

______________________________

 

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, August 31, 2015 1:56 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: [new room/bridgeline] sPHENIX simulation meetings, Tue Sept 1st @ 3-192

 

Dear All,

 

This is a reminder that we will have our weekly sPHENIX simulation meeting Tue Sept 1st. Let’s start the meeting with updates on the simulation production/new software features for pre-CDR. More contributions are welcomed too.

 

The agenda page is at https://indico.bnl.gov/conferenceDisplay.py?confId=1337  , for which the modification password is 1008

 

From now to this Dec, we will use a new default room and a new default bridge line:

 

* 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

        +1 888 240 2560(US Toll Free)

        +1 408 317 9253(Alternate Number)

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

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

______________________________