Joint COMPASS -AMBER Technical Board

Tuesday 19 Jul 2022, 08:50 → 18:00 Europe/Zurich

892/1-D20 (CERN)

Speakers, please fill this template of the minutes for the meeting: 

https://codimd.web.cern.ch/pfAycG6dT0KK7cyActjiyg

1 Communication

Speaker: Stefano Levorato (INFN Trieste (IT) and CERN)

Stefano_Levorato_TB_July_2022.pdf

2 Polarized target status

Speaker: Norihiro Doshita (Yamagata University (JP))

TB20220719.pdf

We performed the TE calibration with three temperature points from 14/4 to 25/4. The those calibration data were analyzed by Gerhard and Kaori quickly. Only 2 % differences relatively was found in the independent analysis. Amplifiers were used for NMR signals during the TE calibration and the gain factors were also measured to be as same as in 2015. The new three gunn diodes were applied for DNP on 02/05 for the first time. The polarizations reached +44.4 %, -41.2%, +46.4% after three days. After repeating tests a few time, the polarized target was used in data taking.

3 ALPIDE status

Speaker: Maxim Alexeev (Universita e INFN Torino (IT))

ALPIDE_tracking_station_update_19_07_22_Alexeev_short.pdf

09:40 Coffee Break

4 ECAL2 MSADC readout

Speakers: Bruno Valinoti (Universita e INFN Trieste (IT)), Igor Konorov (Technische Universitaet Muenchen (DE)), Karl Jonathan Floethner (University of Bonn (DE))

20220719_ECAL2_MSADC_readout.pdf

5 Status of the new GEM stations

Speaker: Dmitri Schaab (University of Bonn (DE))

schaab_TB_meeting_gem_status+pixelgem_status_2022-07-19.pdf

schaab_TB_meeting_gem_status+pixelgem_status_2022-07-19.pptx

Production

• station 1 (2x CG3G detector)
  • fully produced
  • equipped
  • installed to GM11 position
• station 2
  • mechanics fully produced,
  • mech. equipped
  • located at Bonn
  • electronics
    • everything ready except for
    • APV bonding (>10 PCBs available, ~40due)
    • PVD boards 300µm to be exchanged by thicker ones (delamination issues)

Installation station 1

• LV power supply NGP800
  • 1 PS enough for 1 station
  • serves as ADC supply, APV supply, and center segment control (NEW)
  • implemented to DCS - GM11
  • center segment switching box + ETH484 -> replaced by NGP800 channel + Bourndy connector (NEW)
  • issue with OVP when sense wires connected and LOAD executed -> solved by firmware update
• Tests May-June: test with readout pcb foil @ clean area (V. Frolov, S.Huber, I.Konorov)
  • communication (1-way) established - data is sent from APV
  • LOAD command works and configures APV chip
  • reasonable current draw ~5A per detector after LOAD
• Tests June-July: tests @GM11 position
  • fixed issue with OVP of NGP800 power supply
  • mapping illustrations and config files for gemMonitor created
    • APV count <> FPGA firmware channel
    • APV geoID <> ADC | MUX ...
    • implemented in gemMonitor config file
  • data looks bad
    • sync tick marks are seen on decoded data
    • suggestion: data decoding issue on hardware level (between APV and ADC)
  • in contact with APV hardware specialists

Installation optimization potential for station 2

• most of preparation performed at CERN -> Bonn
• LV / HV cables and cable trees ordered at local e-workskop
• thread adaptors M3-M4 ordered at local workshop
• shielding foil designed beforehand -> production by laser cut company
• shielding support structure from ROHACELL (solid foam) designed and in production by local workshop

Off-topic - PGEM

• occupancy: triangles of different occupancies since ~2018..2021
• look at a0/a1 vs TCS phase shows different s-curves for the chips belonging to the two triangles
• s-curves separated by in time
• possible reasons
  • BusCard
  • ADC card / ADC transition card
  • LV supply
• approaches in order
  • latency scans - correct for shift
  • replace deutronics power supply by lab power supply
  • replace ADC transition card
  • replace detector