sPHENIX EMCal discussion

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

Dear All,

Here are the minutes of today’s commissioning meeting (also on indico):

HCal cosmics calibration—Hanpu (see slides)

—————————————————————

- discussion in calibration part of meeting

- trigger rate not understood (~ factor 10 higher than expected)

- estimate from recent triggered data taken is 11-12 hours of data taking for calibration at 3 % uncertainty level

  - expect iHCal to require at least 2-3 times more time (previously (in 912) it was 10 times) 

- Jamie:  it’s not viable to plan for regular cosmics data taking during run to track time dependent calibration

   - Hanpu:  previous studies based on 912 data showed a smaller T coefficient for LED data than for cosmics data, which is not understood

   - Jamie:  then we should reconcile the discrepancy rather than abandoning the LED; chance for that is the upcoming calorimeter read-out fest

Demonstrate gain balancing

————————————

- will until sufficient cosmics calibration data will have been taken

EMCal dark current annealing effect—John

———————————————————

- John had to go before we got to the commissioning part of the meeting

- will discuss next time

Other plans

——————

- Silas plans pedestal study to determine effect of various detectors being switched on/off on pedestal

  - now possible that ECW is back on for EMCal

- Hanpu and Silas plan to determine HCal High/Low gain ratio precisely and confirm that it is the same for all preamp boards

Upcoming events

————————

- calorimeter read-out fest:  Jan 22 - Feb 2

  - good opportunity to take cosmics and LED data to sort out discrepancy in T coefficient

- cosmics data taking for TPC with HCal triggers:  Jan 1-4 (including weekend)

  - will need support from HCal/trigger/DAQ folks

  

Best regards,

Stefan

- 

---------------------------------------------------------------------------------
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 5, 2024, at 14:27, Stefan Bathe <stefan.bathe AT baruch.cuny.edu> wrote:

Dear All,

After the calibrations meeting, we’ll then also have a commissioning meeting:

Select an authentication source indico.bnl.gov

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It would be good to get a report on the recent cosmics data taking for the HCal, and coordinate any upcoming studies and work.

John reported in the GM about an annealing effect in the EMCal radiation damage.  It would be nice to see plots on that also.

Best regards,

Stefan

- 

---------------------------------------------------------------------------------
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
----------------------------------------------------------------------------------

On Jan 5, 2024, at 13:31, Hodges, Anthony via sPHENIX-calibration-l <sphenix-calibration-l AT lists.bnl.gov> wrote:

* This email originates from a sender outside of CUNY. Verify the sender before replying or clicking on links and attachments. *

Good afternoon and Happy New Year everyone!

We'll have our first calorimeter calibrations meeting of the new year this upcoming Monday, January 8^th, at the usual time and place: 11AM at the following zoom coordinates:

https://bnl.zoomgov.com/j/1617635022?pwd=WmlVME9tcnlTYnlkUC9nU3crNTdRdz09

The agenda is already evolving and can be found at the indico link here:

https://indico.bnl.gov/event/21693/

I will present on the bad tower determination in the EMCal, and there will be a presentation on the HCal's sampling fraction from Georgia State. Please feel free to send an email to Blair or myself, and we will add you to the agenda. 

Best, 

-Anthony and Blair

Anthony Hodges, PhD (he/him/his)

High Energy Experimental Nuclear Physics

Postdoctoral Researcher, NSF MPS-Ascend Fellow

University of Illinois Urbana-Champaign

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