General EEEMCal Meeting Summary 2/25/22
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PARTICIPANTS: Carlos, Irina, Renee, Silvia, Vardan, Vladimir, Tanja, Olivier, Hamlet
- JLab prototype tests 2022: planning to test SiPM array configurations
- Array of 16 SiPM (Hamamatsu S14160-3010PS) per PWO block based on BCAL/Hall D array configuration
- Array of 16 SiPM (Hamamatsu S14160-6050HS) per SciGlass block based on BCAL/Hall D array. As an alternative considering the Hamamatsu provided 4x4 array.
- IJCLab-Orsay: planning tests in 2022 of reading out SiPM with ASIC
- Concept idea of an insert for the EEEMCAL to reach to the highest eta ~-3.7.
- In this concept design the insert is installed at the location of the EEEMCAL and is fixed in place.
- The EEEMCAL is installed behind the insert and can be removed by sliding it out.
- To address any gaps in homogeneous electron detection in the backward direction (EEEMCAL and barrel EMCAL) in this design additional EMCal capabilities around the insert at larger radii may be necessary.
- Discussion of the concept idea of an insert for the EEEMCAL
- Increase of acceptance needs to be balanced with feasibility of cluster analysis across boundaries
- How does having an insert impact the physics?
- Is there a way to split open the EEEMCAL into two pieces (clam shell design) and merge the insert with the EEEMCAL?
- How does the fixed insert impact the beamline - is it even allowed to have the blocks close to vacuum pipe?
- Geant Mesh could be a good option for simulating complex designs in GEANT4 - works directly from CAD drawing step file
- If splitting EEEMCAL in two pieces this may have less of an impact on clusters, and so physics, than having a separate insert - needs to be verified
- Action items
- Check if insert EEEMCAL is ok for beamline
- Check if EEEMCAL can be split apart in the middle and incorporate the insert
- Simulation of impact of insert vs splitting EEECAL in two pieces on physics
- Preparing for prototype test in May - the overall plan:
- long horizontal scans at various vertical positions with the PbWO4 using CAEN QDC and Digitizer in parallel (3 days)
- The same thing with FADC250 triggered and streaming readout (3 days).
- Then switch to simpler scans swapping the central crystals with the SciGlass and PbWO4 alternating at various temperatures (4 days).
- If there is time, rotate the calorimeter to study the effect of incident angle (1 day).
- A lower priority would be to place various thicknesses of absorber before the calorimeter (1 day).
- Assuming 1 day for setup and 1 day to clean up and pack the entire test is expected to take 2 weeks.
- Next prototype beam tests are planned for the fall 2022 - the overall plan:
- measure energy resolution of 40cm long SciGlass in 3x3 array prototype
- measure energy resolution with SiPM readout for 4x4 arrays of SiPMs per block (10um pixel for PWO, 50um SciGlass) based on BCAL design from Hall D for a 3x3 prototupe with PWO 20cm long crystals and a 3x3 SciGlass prototype
- commission the Crytur 3x3 prototype with Crytur PWO crystals and in-house designed arrays of SiPMs
- Crytur prototype preparations - investigating options for reducing power/heating
- presently testing a reduction by factor 16
- discussion about options for outside cooling
- water cooling - chiller
- dry air - need to check with Hall D
- planning tests at JLab on test bench before installing in the hall - could be as soon as May
- Discussion of list of specifications for PWO and SciGlass
- include resistance to hadron radiation - how to quantify?
- current measurements are carried out at 18degC
- current measurements are carried out for 100ns integration gate
- add emission peak for both PWO and SciGlass
- transmission longitudinal and transverse captures uniformity of material
- resolution not part of the specifications to vendor, but measurements with prototype are needed
- quote all specifications for the radiation length that the calorimeter will use and leave open spaces or put question marks where specification values are still being determined
- Projectivity of SciGlass blocks
- Sasha Bazilevsky gave a presentation on pi0/gamma discrimination (https://indico.bnl.gov/event/14906/contributions/60352/attachments/39871/66237/athena_pi0g_16feb22.pdf) that suggests that both PWO and SciGlass in EEEMCAL are showing excellent and adequate performance. To improve SciGlass performance it seems that projectivity can help.
NEXT MEETING: FRIDAY 18 MARCH AT 8:00AM ET