POLAR-2 weekly meeting

Monday 9 Nov 2020, 10:30 → 12:15 Europe/Zurich

Zoom info:

 

https://unige.zoom.us/j/2834240209

 

Agenda:

- Update Geneva

- Update Poland

- Update MPE

- Update IHEP

action_items.pdf

Minutes weekly POLAR-2 meeting

Attendance:
- Geneva: Xin, Nicolas, NDA, Jerome, Merlin
- Poland: Adam, Agnieszka, Slawek
- IHEP: -
- MPE: J. Michael

WP0:
- Merlin: CSU suggest to postpone a meeting about the dimensions of POLAR-2 as they do not have all the answers to our questions yet
- Merlin: No news from ESA, will start asking them again next week
- Agnieszka: No news from any of the agencies
- Slawek: Will submit a proposal for irradiation tests at JINR soon, it is ready just needs a signature from the directory

WP1:
- Merlin (on behalf of Johan): Thermal tests of a dummy module have started at DPNC. A module with mechanical SiPM arrays, a prototype PCB layour with resistors which mimic the real components and a Peltier was mounted on a thermally opyimized mechanical prototype. Setup is ready to be placed in  thermal vacuum at the cleanroom in DPNC. Some minor issues need to be solved, should be ok later today. Next week we can get a few plots!
- Merlin: modules 2 + 3 were produced by the mechanical workshop. Module 3 is the best we have now: proper wrapping, latest version of the plastic grid (optimized for SiPM allignment) + EJ-200 bars
- First tests at CERN show a light yield of 1.0 p.e. / keV with module#2. More tests needed to study cross talk and with improved FW. Tests will continue this week with both module 2 + 3 at CERN where we will rececive more sources.

WP2:
- NDA: Will start with characterization of the 14 SiPMs we have at DPNC this week. Small issue with the probe station this morning, can hopefully start later today. Measurements expected to take 1 week (measurements at 4 different temperatures).
- General: we should be able to send 4 arrays to Hybrid this week for the first SiPM mounting tests there. Goal is to get allignment < 50 micron.
- Jerome will check if all the components for the filters are available at DPNC to ship later this week.
- NDA will place the 4 SiPM arrays to be used in small labeled bags, we will provide Hyrbid with the location of each SiPM on the PCB and their orientation.
- Jerome can bring the components directly to the company
- Xin: will this be the final version?
- Jerome: basically yes, potentially small changes to the PCB will be made in the future but nothing related to the SiPMs. This means we can use this next version for thermal vacuum cycling. Potentially also for mechanical qualification tests.
- Jerome finished ADC board design, now being checked by Yannick.
- Jerome will continue with FEE PCB layout design

WP8:
- Merlin: There is a TASSON meeting planned tomorrow, but we are still missing info from CSU
- Nicolas: we will go ahead with the TASSON meeting tomorrow morning (8:30), saw strange things in their description which we need to understand. Also they might be able to answer the questions from CSU.

WP9:
- Johan finished the pyramid design in G4, will upload to github soon
- Merlin can run the transparency simulations as Johan is busy with the thermal tests

Post-meeting:
- Adam has an idea to test GRB localization with neural networks based on recent progress with LIGO, will contact J. Michael to see if he can use it on BALROG like method