sPHENIX EMCal discussion

[Marzia Rosati <marziarosati AT gmail.com>]

I have attached an updated set of slide to the agenda… As Blair suggestedI have widened the pedestal region to time bins>20 and we clearly see out of time particle (peak at time 17 instead of 6-7, see for example slide 25). 

The anomalous pedestal values come from randomly stuck bits (values are ~3700 ~9800 ~11200) or out of time particles. In this run, the stuck bits are happening on random time bins for a specific handful set of channels which could be easily masked and identified with a 3000 ADC threshold in the pedestal region as shown on slide 6.

For the out of time particles what is relevant is that there are several out of time particles in one event like shown for a variety of non contiguous towers in slide 25 and 26 (in fact there were more in those events and can all be found at https://www.phenix.bnl.gov/~marzia/emc/run21518/.). It seems more like a clock glitch than albedo or secondaries. 

Pedro will be back online on Friday and can help with additional studies if there are any questions. 

Best regards

Marzia

On Nov 12, 2023, 12:49 PM -0600, Hodges, Anthony <ahodges4 AT illinois.edu>, wrote:

Good afternoon folks, 

Tomorrow we'll have our next, regularly-scheduled Calorimeter Calibrations meeting at 11:00AM ET. The zoom coordinates can be found here:

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

And the indico page containing the agenda can be found here:

https://indico.bnl.gov/event/21131/

If you have any updates you'd like to show, please let Blair and me know, and we'll 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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