sPHENIX is a new detector at RHIC.

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

Also available on agenda: https://indico.bnl.gov/conferenceDisplay.py?confId=1664

 

Software update

 

New pull request from Mike McCumber on activating G4 truth compression in the default macros: https://github.com/sPHENIX-Collaboration/macros/pull/12

 

Discussion 1: use a separated macro for output manager?

Chris: as we have more complex output options, it will be good to separate output manager settings into separated macros

Mike: good to have the macro separated earlier on

Jin: let’s merge this pull request first

 

Discussion 2: use exclusion list VS inclusion list for output manager?

Mike: black list is the right way to go for truth compression because that 1)  hit/cell nodes are emptied at compression step and no point to output. 2) won’t miss node.

Chris: PHENIX production always used the inclusion list to pick relevant node for output. Except similar experience for sPHENIX

Jin: prefer exclusion list for standard GitHub macro since it output everything on DST tree. On the other hand, Production macro leave to expert to tune.

 

Discussion 3: necessity to activate this new feature in the GitHub macros

Mike: the new shower object are always process regardless whether compression is activated. Therefore the compression feature may not be needed for the default macro as it is mainly used in small scale test.

Jin: Good point. But still prefer merging this pull request to show how compression can be performed. But good to have the truth compress to be not active by default to avoid confusion in read back

 

To move forward:

Action Item[Mike, already DONE]: set bool do_dst_compress = false; , and then merge this pull request.

 

 

 

Test beam simulation – Murad Sarsour

 

Page3: Geant4 Geantino edge scan VS Richie’s drawing

 

Chris: problem on geometry VS Richie's corner point.

Jin: does Richie's point consistent with the formula you are using? Concern is inconsistent thickness or other problem that may lead to deviation between simulation and data like sampling fraction.

Chris: suggest to extract coordinates of four corners (X,Y,Z) of the absorber plates in Geant4 and comparing that to Richie’s drawing.

 

Action Item [Murad]: as Chris suggested.

 

 

Jin – for the outer Hcal, we expect 21 iron plates and 20 scintillator layers in between. We missed one layer iron plate in the current simulation. Similarly for inner Hcal too.

 

Action Item [Murad]: adjust number of scintillator / iron plates to be consistent with the prototype design. More information on HCal drawing was fetch from Richie and attached to agenda.

 

 

Page 5:

Jin: sPHENIX Hcal is built to be rotational symmetric around the origin by rotation of 1.125 degrees. The fact that the thickness VS phi do not repeat periodically indicates inconsistency in definition of origin or layout of the plates.

 

Additional post meeting info:  

latest engineering design from Richie attached to agenda (https://indico.bnl.gov/getFile.py/access?subContId=0&contribId=1&resId=0&materialId=slides&confId=1664 ) showing that

1.       Inner Hcal and outer Hcal share the same origin (precise to sub-mms). This point should be used as the origin of Geantino scan.

2.       Five rays of reference Green Lines extend from origin to the outer Hcal with spacing of 1.125 degrees. If look closely on the outer Hcal, each green ray pass through exactly the same material at the same angle on the outer Hcal (local rotational symmetry of 1.125 degree)

3.       Therefore, we would expect material scan from Geant4 simulation show the same symmetry when rotated by 1.125 degree

 

Action Item [Murad, Jin, Chris]: follow up with Richie to fix it. (More information on HCal drawing was fetch from Richie and attached to agenda.)

 

 

Page 8:

Murad: the sampling fraction was produced by muon simulations

 

Sarah: center of the sampling fraction distribution is off on fit. Suggest use larger portion of the lower SF in the fit.

 

Jin: why there is a 5% energy dependence?

Murad: it appears to be small variation. To be understood

 

Jin: why there is a spike at sampling fraction = 0?

Murad:  could due to the thrown particle outside the active area of the scintillator. But need double checks.

Plan: cut on acceptance and see whether it goes away.

 

Action Item [Murad]: follow up with the above three items.

 

 

Slides 10: energy response

Sarah: how does the width comparing to prototype1?

Murad: see next slides for resolution

 

Slides 11: resolution VS E

Murad still early study as we are trying to understand details of simulation.

 

Summary slides:

Jin: please send the RCF setup and macro, so I could add the EMCal in parallel.

Action Item [Murad]: agree

 

 

______________________________

 

Jin HUANG

 

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________

 

 

> -----Original Message-----

> From: Huang, Jin

> Sent: Tuesday, January 19, 2016 8:05 AM

> 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 and software meeting, today 1PM

> EST @ 2-219

>

> Dear All,

>

> This is a reminder that we will have our regular sPHENIX simulation and

> software meeting, Tue Jan 19th, 1PM EST @ 2-219.

>

> Currently on the agenda: following software update, Murad will discuss

> simulation preparation for the Hcal test beam. More contributions will be

> welcomed too.

>

> The agenda page is at

> https://indico.bnl.gov/conferenceDisplay.py?confId=1664 , for which the

> common modification password is "1008"

> •            For residents at BNL, we will meet at the 2-219 conference room

> •            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

>

> Brookhaven National Laboratory

> Physics Department, Bldg 510 C

> Upton, NY 11973-5000

>

> Office: 631-344-5898

> Cell:   757-604-9946

> ______________________________