General Meeting Summary 4/1/21

PARTICPANTS: Aaron Brown, Alexandre Camsonne, Arshak Asaturyan, Bogdan Wojtsekhowski, Brad Sawatzky, Carlos Munoz-Camacho, Carlos Yero, Charles Hyde, Chris Cuevas, Rolf Ent, Hamlet Mkrtchyan, Julie Roche, Marie Boer, Paulo Medeiros, Steve Wood, Steven Lassiter, Vardan Tadevosyan, Vladimir Berdnikov, Tanja Horn

SUBSYSTEM UPDATES

• Magnet

• ODU student started working on field
• TOSP approved
• Bogdan redid a few measurements - results seem to indicate good agreement with model, which seems different from ODU measurements. More detailed update at next meeting

• Crystals

• Have been receiving crystals from Crytur at ~30/month
• Now have three crystals grown with new raw material - quality and performance seem comparable to crystals grown with PANDA raw material

Electronics (Chris)

• Connector certification - summary table created of all components - three items identified as yellow

• DAQ - boards prepared

• Action: Brad will follow up with Chris on items marked in yellow

Anode current measurements (Vladimir, Carlos Y., Fernando, et al.)

• Signal small (mV scale) - much noise; no structure to noise (not 60Hz)

• clean grounds were applied
• shielding could perhaps be optimized - Faraday cage around PMT?

• Dynode 10 with PMT at 900 V should work

• Select 1 V scale for dynamic range as default and see how many PMTs will be above 900 V

• Dynode 9 scenario seems safest - but noise issue - need to check a few things

• Actions:

• Obtain configuration of dynode shortening from Fernando
• Further investigate dynode 9 noise level - perhaps introduced by data acquisition and not PMT and divider; suggestion: don't couple directly to oscilloscope

• Additional information from Fernando:

• Dynodes 9 and/or 10 are connected to the anode junction on the PCB, moved from their usual resistor chain locations on the divider chain. Wires (about 3 to 4 inches long) from the PMT socket connect to the PCB, so not the best for minimizing noise. We can test these connections (anode, Dyn 9, Dyn 10) to the PCB via small coax cables (instead of wires) with the shields connected to GND just on the PCB. This will be a bit cumbersome to do but doable for testing

• The dark box is not shielded. The detector is not completely shielded, I believe, so our tests may be a worst case scenario. However, consider that just connecting a scope to any connection, even with good shielding, will yield noise of the order of 2 to 5 mV peak-to-peak.

• We can test the minimum noise we can obtain by employing coax cables, as described above, wrapping the divider with some insulation and then wrap it with copper tape and grounded. Note that the PMT side cannot be shielded and the cable exit side is leaky. This, however, will give us some measure as to what shielding can accomplish.

DSG UPDATE (Aaron)

• HV Supply Cable testing - safety look connection path chart created

• Developed hardware interlock system block diagram

• Sensor scanning system

• Evaluation of stability of voltage and current data for each channel

• Labview controls for keysight - for production version prefer Linux version of Labview

• Action:

• prepare sending out CAEN modules for repair - modules have already been separated out

DESIGN UPDATE (Paulo)

• ongoing work on cable routing, cable trays, etc.

• Action:

• Figure out how to best store the procured material (currently stored in hall) - some may be installed on SHMS, other parts may have to go to storage

Software (Carlos Y.)

• Working on clustering algorithm

TASK LIST

• Keep updating the googlesheet

• more detailed discussion at next meeting

NEXT MEETING: 15 APRIL AT 9AM ET