sPHENIX HCal discussion

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

Dear All,

Here the minutes of last week’s calibration meeting (also on indico):

Regards,
Stefan

HCal simulation (outer only) based on Rich's CAD drawings—Xiaochun (see slides)

———————————————————————————————————————————————————————

- presented first version of actual (based on drawings) implementation of outer HCal in Geant

- need to re-confirm material definition

- Q/A (settled by subsequent email discussion on list)

  - location of chimney sectors?  Top three sectors

  - rotation of barrel?  Combs are vertical/horizontal

  - sector and tile indices?  Decoding from packet ID; makes sense to have a tower index that follows digitizer channels mapped to another one that increments in eta, phi

- outlook:  waiting for drawings from Rich to do the same for innerHCal

Temperature and PR correction of inner HCal cosmics data—Hanpu Jiang (see slides)

—————————————————————————————————————————————————

- have calibration data for 19/32 sectors

- T and PR correction reduces differences of MPV averaged over towers between sectors (slide 3/4)

  - but significant differences remain and should be further investigated

- T and PR corrections generally narrow distribution of MPV for individual tile shapes as expected qualitatively

  - for some few shapes the PR correction does not significantly narrow the distribtution

  - but the PR distribution for those shapes is narrow (shown by Saif in real time) so that this is not unexpected

- Q/A (slide 17)

  - no PR data for sector 26?  That’s b/c that sector was not assembled yet at the time of the meeting

  - no pre-burn-in test for sectors 31 and 32?  That’s b/c we did the burn-in before we had signal cables.

 - only 10 calibration runs (not 12) available for sector 17?  That’s b/c the DAQ crashed.  However, the 10 runs should be good enough for the calibration (statistically).

Rotation test—Shuhang Li (see slides)

——————————————————————————

- sector 12 was rotated into same position as outer HCal (this is a 45 degree rotation, see attached schematic)

- without similar-energy-but tower shows same low-energy peak in spectrum as seen in outer HCal earlier

- rotation favors perpendicular paths through tiles as opposed to parallel paths leading to shorter path lengths and less variation => lower, narrower peak, which is observed

- rotation test provides handle on simulation verification

- confirmation that all calibration data can be taken in non-rotated position since in which sectors are assembled

 

- 
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Stefan Bathe
Professor of Physics
Baruch College, CUNY
and RIKEN Visiting Scientist

Baruch:                                     BNL:
17 Lexington Ave                      Bldg. 510
office 940                                  office 2-229
phone 646-660-6272                phone 631-344-8490
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On Jan 3, 2022, at 15:12, Stefan Bathe <stefan.bathe AT baruch.cuny.edu> wrote:

Dear All,

We’ll have our regular HCal Calibration Meeting tomorrow, Tuesday, January 4, right after the HCal meeting:

https://indico.bnl.gov/event/14068/

(Zoom info below)
 
Please let me know if you’d like to present something, and I’ll make an entry for you on the agenda page.

Happy New Year!
Stefan

ZOOM INFO:

Stefan Bathe is inviting you to a scheduled Zoom meeting.

Topic: HCal Calibration
Time: This is a recurring meeting Meet anytime

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- 
---------------------------------------------------------------------------------
Stefan Bathe
Professor of Physics
Baruch College, CUNY
and RIKEN Visiting Scientist

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