sPHENIX EMCal discussion

[Jamie Nagle <jamie.nagle AT colorado.edu>]

Hello All,

There have been various discussions within the electronics group and off-the-lists.   I thought it would be useful to put  this information on the list for everyone in one place.

For Run-2023, there were not enough ADC boards ordered to read out everything, and a decision was made to not read out the high-eta stripe of the  EMCal -- that corresponds  to 32 boards, or ~ 2000 channels not available.

Currently, there is no  contract signed between Brookhaven and Columbia/Nevis for those additional boards, though that is in progress.   Thus, given that status,  there will  be no additional ADC boards  on that front for Run-2024, only potentially for Run-2025.   

That  said, the order from the NSF MRI funds for sEPD ADC boards was placed and those boards are expected at Nevis  next week  for testing.    That corresponds to approximately 15 ADC boards.    Thus, that will  effectively "free  up" the 12 ADC boards borrowed by the sEPD this past run.     There are also  a  set of ADC boards  that had various  issues last  run that are being tested, and for which a subset  might be repairable.     

Bottom   line, we are likely to have  some boards to fill in the high-eta stripe for Run-2024, but likely not the  entire stripe with the exact number depending on board yield and repairs on a small number of boards.  

Sincerely,

Jamie

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|| James L. Nagle   
|| Professor of Physics, University of Colorado Boulder

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