sPHENIX HCal discussion

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

Hi John

 

Xiaochun and Murad might have better insights. My understanding is that does require exporting the rings form the mechanical model. Another caveat/complication is that, in the G4 world, portion of the support ring is inside the HCal envelope and partially outside, which would require the ring to be split into inner/outer rings when installed in G4.

 

Given this is an inactive material shadowing HCal towers, it would be probably OK to implement these rings in a simplified G4 shapes approximately matching the mechanical model. Then it can be done quickly and easier to be split inside/outside HCal envelope, plus help simulation speed. We do need a volunteer to build it and I can help with advices.

 

Cheers

 

Jin

 

 

 

______________________________

 

Jin HUANG

 

Physicist, Ph.D.

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________

 

From: Lajoie, John G [PHYSA] <lajoie AT iastate.edu>
Sent: Friday, October 7, 2022 9:58 AM
To: Huang, Jin <jhuang AT bnl.gov>; sphenix-hcal-l AT lists.bnl.gov
Cc: 'sphenix-software-l AT lists.bnl.gov' <sphenix-software-l AT lists.bnl.gov>
Subject: RE: [Sphenix-software-l] Notes on changes in the HCal simulation

 

Hi Jin,

 

Many thanks for all this work as well as for the extensive documentation.

 

Given all the work done importing the HCAL geometry in GDML, I would think that the large support rings could be imported in a fairly straightforward way?

 

John

 

From: sPHENIX-software-l <sphenix-software-l-bounces AT lists.bnl.gov> On Behalf Of Huang, Jin via sPHENIX-software-l
Sent: Thursday, October 06, 2022 10:58 PM
To: sphenix-hcal-l AT lists.bnl.gov
Cc: 'sphenix-software-l AT lists.bnl.gov' <sphenix-software-l AT lists.bnl.gov>
Subject: [Sphenix-software-l] Notes on changes in the HCal simulation

 

Dear HCal group

 

I am writing to bring to your attention a major change in the HCal simulation was merged this morning. A technical note is part of the pull request below:

https://github.com/sPHENIX-Collaboration/coresoftware/pull/1679

which including magnetic field in HCal absorber, flip of the HCal to sPHENIX coordinate system, and fixing HCal envelopes

 

A few TODOs and cautions:  

• Please update your local macros if you use custom HCal macro, as the envelope and field map have changed in the HCals.
• There were overlaps in both inner and outer HCal (beyond the G4 overlap check scope). For any study involving the HCals, it would worth redoing with these fixes now in build
• We need a new phi-0 calibration for the first sectors for both HCals, which currently has a small shift [link to HCal in] [link to HCal out]
• We need to implement the new HCal support ring that holding outer HCal up, which is in the acceptance of outer towers.

 

Let me know any question or suggestion too.

 

Cheers

 

Jin

 

 

 

______________________________

 

Jin HUANG

 

Physicist, Ph.D.

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________