sPHENIX discussion of software

[Xiaochun He <xhe AT gsu.edu>]

Dear John^2,

This is NOT surprising from the Geant 3 or 4 simulation.  It does not track 
neutrons at very low energy.  If one tracks the neutrons and converts the 
mass into the "visible" energy, one should get the most "lost" energy back, I 
would think.

This is not a huge problem as long as we have better knowledge about the 
sampling fraction and the shower profile. 

my two cents,
Xiaochun
--

Xiaochun He
Professor
Department of Physics & Astronomy
Atlanta, GA 30303

________________________________________
From: sphenix-software-l-bounces AT lists.bnl.gov 
<sphenix-software-l-bounces AT lists.bnl.gov> on behalf of John Haggerty 
<haggerty AT bnl.gov>
Sent: Tuesday, July 7, 2015 4:25 PM
To: sphenix-software-l AT lists.bnl.gov
Subject: Re: [Sphenix-software-l] [minutes] Tue July 7 1-3PM sPHENIX 
simulation meetings @ 2-187

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
>
> ______________________________
>
>
>
> _______________________________________________
> Sphenix-software-l mailing list
> Sphenix-software-l AT lists.bnl.gov
> https://lists.bnl.gov/mailman/listinfo/sphenix-software-l
>


--
John Haggerty
email: haggerty AT bnl.gov
cell: 631 741 3358