sPHENIX HCal discussion

[Stefan Bathe <stefan.bathe AT baruch.cuny.edu>]

Dear All,

Here some notes from today’s meeting (presenters, please post slides to 
indico!):

- Ejiro (slides)—update on Geant simulation
  - showed tower-by-tower energy distributions (goal:  eta dependence)
  - suggestions:
    - correct tower energy for path length (angular dependence)
    - plot tower energy mu and sigma vs eta
    - MC distribution can be used as fit sample for experimental data
    - sample plane over entire sector and sample angular distribution to 
mimic experimental data

- Dan Lis (verbal)—working on:
  - full sector (i.e. with half-absorber plates for top and bottom) rather 
than segment of full detector as proxy
  - cosmic spray class different from particle gun
  - event display

- Hanpu (slides)—fitting update
  - showed update on results of combination of peak finder (to fix range for 
fit) and gamma distribution fit (to extract mean)
  - work reliably now so it can be used for both calibration and tower QA (2 
% statistical uncertainty; fit looks good so that systematic uncertainty 
probably low)
  - fit uncertainty similar to systematic difference between fit and peak 
finder peak location
  - suggestions:
    - exclude non-suitable data (e.g low statistics, rotation test, wrong 
voltage)
    - correct for tile Performance Ratio (PR):  see info below
    - quantify chi^2/ndf

Shuhang (slides)—fitting update
- broke down long run into subsamples
  - no significant differences
  - peak finder shows systematic shift depending on statistics (since bin 
width depends on statistics)
  - shift goes up as statistics go down; gamma distribution fit still above 
peak finder (see Hapu’s slides); points to some systematic error in gamma 
distribution fit
  - but fit probably (awaiting chi^2/ndf, see above) good enough
  - first of three recent burn-in runs for sector 13 shows vastly lower ADC 
mean:  concern
  - need run list with comments, problems, and solutions on wiki
  - have elog:  https://sphenix-intra.sdcc.bnl.gov/WWW/elog/HCAL/ 

Veronica (verbal update)—fitting update
- looking into recent burn-in runs with corrected voltage for production SiPMs
  - MPV changed
  - but no analysis yet

Dan Lis (slides)
- plotted ADC peak vs integral
- linear for some channel, non-linear (plus fluctuations) for others
- concern
  - suggestion:  does pattern repeat for different runs?


Links:
Calibration wiki location:
https://wiki.bnl.gov/sPHENIX/index.php/HCal_Calibration
Tile Installation db:
https://urldefense.com/v3/__https://docs.google.com/spreadsheets/d/1rIUAVjWNd7wE9ms2BfCqUAGH0KbNNxG7OtwXJJKNzWY/edit?usp=sharing__;!!P4SdNyxKAPE!UFC14ZOMVzcNI0YJIpSHB8vSx2whCmVz7VycW6F8uXVCMRjyV51id1nF4UyX_kVkIzPiNw2_ldM$
   
elog location:
https://sphenix-intra.sdcc.bnl.gov/WWW/elog/HCAL/

Regards,
Stefan
-- 
---------------------------------------------------------------------------------
Stefan Bathe
Professor of Physics
Baruch College, CUNY

Baruch:                                     BNL:
17 Lexington Ave                      Bldg. 510
office 940                                  office 2-229
phone 646-660-6272                phone 631-344-8490
----------------------------------------------------------------------------------

> On May 31, 2021, at 10:27 PM, Stefan Bathe <stefan.bathe AT baruch.cuny.edu> 
> wrote:
> 
> Dear All,
> 
> We’ll have our next HCal muon calibration meeting tomorrow, Tuesday, June 
> 1, at 11:00am.
> 
> Here’s a link to the agenda:
> 
> https://indico.bnl.gov/event/12037/
> 
> The zoom info is on the agenda page and also at the bottom of this message.
> 
> (We had a brief get-together also at the end of last week’s HCal meeting.  
> I created an indico agenda page for that meeting after the fact here:  
> https://indico.bnl.gov/event/12036/  If those who presented could please 
> upload their talks there, that would be great.)
> 
> Regards,
> Stefan
> 
> --
> 
> Stefan Bathe is inviting you to a scheduled Zoom meeting.
> 
> Topic: HCal Calibration
> Time: This is a recurring meeting Meet anytime
> 
> Join Zoom Meeting
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>  
> 
> Meeting ID: 817 4933 0526
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> -- 
> ---------------------------------------------------------------------------------
> Stefan Bathe
> Professor of Physics
> Baruch College, CUNY
> 
> Baruch:                                     BNL:
> 17 Lexington Ave                      Bldg. 510
> office 940                                  office 2-229
> phone 646-660-6272                phone 631-344-8490
> ----------------------------------------------------------------------------------
>