Weekly Meeting

Monday 13 Apr 2026, 09:00 → 09:30 Europe/Rome

Davide Fiorina (GSSI & INFN)

https://cern.zoom.us/j/9553247390

Rolling Report

09:00 → 09:01 Previous week recap

Speaker: Davide Fiorina (GSSI & INFN)

Previous week recap (by person) — week of this meeting

Davide P.

• Confirmed PMTs and sockets are at LNF and ready for testing.
• Started planning a schedule-update meeting requested by referees (late April slot considered).

Davide F.

• PRA update and O₂ sensor procurement remained pending due to missing external feedback.
• Continued pre-commissioning transfers (cameras and PMTs from LNGS to LNF).
• Completed first GEM stack modification work and prepared for cleaning/installation; second stack ready to install.
• Selected the usable V-bonded GEM for the second stack and prepared the other two for return to CERN.
• Planned a new field-cage mounting test on the structure.
• Advanced copper drawings (PMT–copper interface completed) while keeping PMMA vs thin-window options open.
• Continued chasing the copper-box movement quote (still missing) and issued the first Fascicolo Tecnico draft for review.
• Logged Hall F action: measure copper pallet dimensions and report to Elisabetta.

Giorgio

• Reported improvements in CAM-to-PMT association and digitisation tooling (Atul variable implemented; OPTUNA notebook shared).
• Fixed a major digitisation bug.
• Confirmed LNF PMT test setup (black box + LED) is ready for this week.
• Noted Rn work allocation: Rob starting with Ali contributing weekly.

Stefano

• Continued preparing the PMT calibration setup at LNF and monitored trigger-module progress (Hermann).
• Rb-83 source remained unresolved; Italian Broken cannot supply but is open to alternatives.

09:01 → 09:02 DavideP report

Speaker: Davide Pinci (Istituto Nazionale di Fisica Nucleare)

09:02 → 09:03 Elisabetta report

Speaker: Elisabetta Baracchini (Istituto Nazionale di Fisica Nucleare)

09:03 → 09:04 DavideF report

Speaker: Davide Fiorina (GSSI & INFN)

• N66 / GEM mechanics: all N66 components for both GEM assemblies have been retrofitted. The first GEM stack has been mounted, but foil stretching is still problematic because the pulling force bends the long side of the frame, leading to non-uniform tension. Several mitigation strategies were tested; this week the plan is to add alignment pins and try again.

• Second GEM stack: mechanically ready for assembly, but waiting for feedback from the first-stack procedure before proceeding.

• Field cage: still waiting for the punching tool from the LNF workshop to retrofit the foil and attempt mounting.

• Cathode: arrived at LNF, so assembly can now proceed.

• Copper box: Cesidio has almost completed the detailed design; a joint review is planned for tomorrow.

• CYGNO-04 bellow prototype: the prototype has been drawn, with the aim of 3D-printing it this week.

• Oxygen sensor procurement: supplier was pinged again and a second vendor has been contacted. It is not yet urgent, but the issue should now be escalated.

• PRA update: NIER replied and asked for further details that were given

• Pre-commissioning procurement: the RS order has been sent to purchase everything needed.

• LN2 test: Maccarrone from LNF gave availability to the instrument and tested the dewar in LNGS. Slot for this week, need the wheel adapters from the LNGS workshop

• HV validation underground: today the plan is to go underground to validate HV distribution box connections and cables.

• DAQ / logistics: start moving the DAQ and other required equipment from Hall F to LNF for pre-commissioning.

• Meetings / scientific updates: today at 23:00 there will be the gas meeting, where Kentaro is expected to present the proposal for installing a CYGNUS detector inside the Super-K tank. On Wednesday, Giorgio will give a talk at the INFN committee meeting on directional dark matter searches.

09:04 → 09:05 Giorgio report

Speaker: Giorgio Dho (Istituto Nazionale di Fisica Nucleare)

Analysis

•  Estimation of gain with muons and Vbond GEM close to completion. All ingredients for V-bond saturation paper to be written
• Meeting next week and more contact with analysis members foreseen

LNF

• PMT retested and one more to establish the repeatibility of the procedure
• Federico wrote a document with the procedure which should be comprehensive
• One more PMT turned out to be broken
• Cathodes arrived from CERN and will be collected on Friday
• RS order sent

09:05 → 09:06 Stefano report

Speaker: Stefano Piacentini (GSSI and INFN LNGS)

PMT tests:

• One pmt failure -> important to test all the PMTs and eventually send them back to Hamamatsu
• Organization of the tests: I can coordinate this activity. I will evaluate the availability of people and organize a start in Frascati starting from next Tuesday (April 21)
• Analysis tools available on github and tested on the notebook

 

DAQ issue with the camera:

• I isolated the problem to the camera itself: at random times it gives a timeout error and does not respond anymore to other commands
• Something we do at the initialization level solves the issue -> it can be recovered through software
• Another strong hint that the problem is something at the camera level: the problem disappeared as we lowered the gain of the datataking (and therefore the GEM instabilities like discharges, sparks and hotspots). As an additional confirmation, I report that during Christmas 2025 I tested the camera in "pedestal" condition (namely absolutely no light) and in 2 weeks of continuous data taking the problem never happened.
• As soon as we can do it, we will test the camera in a "bright" setup condition so that we can finally develop a software recovery procedure
  
  

Trigger module tests:

• I confirm that me and Herman tomorrow (April 14) in the morning will go at LNGS in HdM to install and test the trigger module update.
• Today I will prepare the infrastructure to install the module (especially the network setup needed for this test)

 

 

09:06 → 09:07 Giulia report

Speaker: Giulia D'Imperio (Istituto Nazionale di Fisica Nucleare)

• CYGNO-04 simulations: The GEM and Field Cage simulations are complete. Work is now progressing on the cathode, PMMA, and other components.
• LIME 55-Fe simulations: Davide P. provided the source dimensions, distance, and collimator details, including the full source geometry. This allows for more realistic simulations. These inputs are needed to improve digi optimization.
• Simulation meeting: Scheduled for today at 2 PM.

09:07 → 09:08 Fabrizio report

Speaker: Fabrizio Petrucci (Istituto Nazionale di Fisica Nucleare)

09:08 → 09:09 Andrea report

Speaker: Andrea Messina (Istituto Nazionale di Fisica Nucleare)