General EEEMCal Meeting Summary 2/17/23

PARTICIPANTS: Tanja Horn, Silvia Sykorova, Carlos Munoz-Camacho, Hamlet Mkrtchyan, Josh Crafts, Justin Frantz, Mariangela Bondi, Renee Fatemi, Richard Milner, Sasha Somov, Vladimir Berdnikov, Ioana Niculescu, Irina Shestakova, Sasha Bazilevsky, Julie Roche, Larry Isenhower, Yeran Ghandilyan, Vardan Tadevosyan, Crytur/Olivier, Hrachya Marukyan

PROTOTYPE TESTS PWO

PWO + SiPM (JLab)

• measured energy resolution wth a 3x3 prototype with 9 crystals and Fernando designed SiPM 4x4 array based on GlueX barrel calorimeter (pitch is 10um, 3mm x 3mm)
• gain adjusted by bias voltage
• measured at one beam energy
• measurement complete - analysis ongoing

PWO + SiPM (CRYTUR)

• signal pre-amplifier attached - can better adjust dynamic range -- more flexibility
• amplifier linearity is important - measurements done to confirm it
• 9 crystals PWO with 4x4 SiPM array per crystal (pitch is 15um, 3mm x 3mm)
• low power consumption - no cooling needed
• mesaurements ongoing: better alignment of the prototype, switch ADC range to 1V, re-position the prototype to slightly different energy

Q&A

• Any idea about noise? - not yet, need to know MeV equivalent in terms of pixels, need to know linearity

• no cooling done
• regression allows to do calibrations dynamically
• BCAL SipM 80MHz noise on single pixel, this seems improved

• Position scan done?

• Uniformity of SiPM as function of position
• edge effects since area covered is smaller than crystal surface
• could scan across surface with layer to check the uniformity
• larger array like 5x5 would be better since can reposition the shower

• Plans for measuring dynamic range and linearity?

• could use lasers or diodes

• Sensitivity to temperature

• clever design allows for cooling essentially by convection

• Sensitivity to radiation

• any tests that can be done to evaluate it?

• Larger SiPM array - tests

• test bench could be done
• Timeline: September/October 2023

PROTOTYPE TESTS SCIGLASS 40cm

SciGlass 3x3 array with SiPM

• pitch 25um, 3mmx3mm, Hamamatsu S13160-6025
• readout designed by Fernando - also based on BCAL

Q&A

• one channel does not work - known issue with channel #2

• post slides

• Add emission spectrum to the transmittance plot

• Dynamic range requirement for barrel EMCal different from 4 GeV JLab beam test - need to take into account

SciGlass 5x5 array with SiPM (INFN)

• pitch 50um, 6mmx6mm, Hamamatsu S14160-6050HS

DISCUSSION OF ACTIVITIES NEXT THREE MONTHS

• Post as editable document

• Add backend electronics work

NEXT MEETING 17 MARCH AT 8AM ET

• Sooner if there is any change in status (new results, news on proposal)