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sphenix-software-l - Re: [Sphenix-software-l] [minutes] Tue July 7 1-3PM sPHENIX simulation meetings @ 2-187

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Subject: sPHENIX discussion of software

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  • From: John Lajoie <lajoie AT iastate.edu>
  • To: <sphenix-software-l AT lists.bnl.gov>
  • Subject: Re: [Sphenix-software-l] [minutes] Tue July 7 1-3PM sPHENIX simulation meetings @ 2-187
  • Date: Tue, 7 Jul 2015 15:37:21 -0500

Hi John,

    Interesting! Looking at the sampling fractions I calculated in my talk today I think it's clear that edep() is likely *not* fully capturing the nuclear binding energy, despite what we think we know from the GEANT4 documentation.  If it were then the sampling fractions calculated using edep() and the visible energy (from the ionization energy alone, with Birks factor applied) should be quite a bit more different than they actually are.

    What edep() captures, and the nuclear binding energy, may well depend on the physics list you use as different packages make more or less information available?

Regards,
John

On 7/7/2015 3:25 PM, John Haggerty wrote:
John,

Just to add another point, I used my favored GEANT example AnaEx01 to just add up all the energy from a single incident 50 GeV pi+ in a silly calorimeter:

---> The calorimeter is 10 layers of: [ 1000mm of G4_STAINLESS-STEEL + 1mm of G4_POLYSTYRENE ]

(i.e., 10 m of steel, and a large transverse size) with all GEANT defaults is that same 45 GeV you mentioned.  I tried putting the particle into the middle of the calorimeter to see if there was some kind of albedo going on, and it gave a similar distribution.

On 7/7/15 2:15 PM, Huang, Jin wrote:
Also available on the agenda:
https://indico.bnl.gov/conferenceDisplay.py?confId=1181

*__*

*_John - HCal_*

Page 2:

Chris: "HP" in QGSP_BERT_HP physics list means high precision neutron

Page 3:

Analysis packages available on GitHub, useful for other people to use as
examples:

https://github.com/sPHENIX-Collaboration/analysis/tree/master/HCal-analysis

Page 5:

10% of the energy is missing when sum all sensitive volume.

Chris: did study on hadron shower energy conservation in a large block
of material about one year ago, which showed similar behavior.

*Action Item [Martin]*: Test to energy conservation directly with a
black hole of small radius and a block of large material, in order to
check the consistency.

Page 7:

Achim: shall we also check the spatial distribution of the shower for
different absorber materials?

*Action Item [John]:*will be able to test so.

Page 12:

Jin: suggest plot SF VS CG of the subsystem compartment being
investigated (e.g. inner Hcal only)

*Action Item [John]:*agree

Page 13, 14:

Jin: E_{OFFSET} has to be a function of three measured light yield. How
to estimate?

Craig and John: it is still an open question

John and Chris: good to plan of large scale simulation production jobs
in the July simulation work fest.

______________________________

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, July 6, 2015 2:58 PM
*To:* 'sphenix-software-l AT lists.bnl.gov'; phenix-nextmid-l
*Subject:* [One-time different room 2-187] Tue July 7 1-3PM sPHENIX
simulation meetings @ 2-187

Dear All,

This is reminder of our weekly sPHENIX simulation meeting Tue July 7
1-3PM. For residents at BNL, we will meet in the *2-187 conference room*
(back to regular room next week).

Currently on the agenda are HCal simulation update by John Lajoie. More
topics are welcomed too.

The agenda page is at
https://indico.bnl.gov/conferenceDisplay.py?confId=1181  , for which 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

______________________________



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--

John Lajoie

PHENIX Deputy Spokesperson

Professor of Physics

Iowa State University

 

(515) 294-6952

lajoie AT iastate.edu


Contact me: john.lajoie



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