Taskforce Weekly Plenary Meeting
Agenda, 3 March 2025
Meeting time: 14:30 – 16:00 CET
Zoom meeting room:
Attendees: All task force members
Chair: Fiodor Sorentino
Key Takeaways:
Cleanliness requirements and procedures for towers/payloads discussed, with action to verify clean room sizing in detector layout
Tower categorization and options identification work ongoing, to be completed before Amsterdam meeting if possible
Noise budget simulations presented, including "worst case" scenarios without filter cavities
Proposed agenda for Amsterdam meeting shared, with focus on detector layout and carbon reduction
New tools introduced: action item tracking spreadsheet, glossary/acronyms in Overleaf doc, civil engineering cost estimation tool
Next steps/actions:
Complete tower options identification if possible before Amsterdam
Prepare for tunnel diameter reduction discussion at Amsterdam meeting
Add PISA meeting action items to tracking spreadsheet
Start using glossary/acronym functionality in Overleaf document
Expand civil engineering tool to include tunnels
Refine criteria for civil engineering cost estimates
Update on tower categorisation
14:30-14:50 CET
Point presented by: Romano Meijer
Point submitted for: information
Summary of discussion:
Romano provided an update on the work to categorize and map the different tower components and nodes onto the optical layout. This includes incorporating the periscope towers and high frequency test masses. The task force members agreed to continue this work offline, focusing on completing the quantification of residual motion and mapping the vacuum vessel requirements. There was also discussion of the need to consider integrated tower concepts that optimize across the different subsystems.
Takeaways:
Romano updated categorization based on PISA discussions and new optical layout
Separate category added for high frequency test masses
Options for different categories still need to be summarized
Aim to complete options identification before Amsterdam if possible
May need dedicated session on tower integration in Amsterdam
Clean rooms needs from cleanliness requirements
14:50-15:10 CET
Point presented by: Piero Rapagnani
Point submitted for: information
Summary of discussion:
Piero provided an overview of the key challenges with maintaining cleanliness for the optical components, including fiber damage from dust and particles, absorption issues, and stray light. He outlined the typical clean room setup and procedures used, emphasizing the importance of a multi-step cleaning process starting from the initial component preparation through final assembly. The task force members discussed the difficulty of maintaining cleanliness, especially during critical assembly steps, and the need to further investigate the specific particle size distributions that pose the greatest risk.
Takeaways:
Piero Rapagnani presented on cleanliness needs for towers/payloads
Key risks: fiber damage from particles, point absorbers on mirrors, increased stray light
Particles >10 μm most dangerous for fibers/mirrors
Clean room class ISO 5 (old Class 100) recommended minimum
Detailed cleaning procedures outlined, including ultrasonic baths and washing tunnels
Action: Verify clean room sizing in detector layout with Piero/Antonio
Update on noise budget
15:10-15:25 CET
Point presented by: Valeria Sequino
Point submitted for: information
Summary of discussion:
Valeria summarized the ongoing noise budget analysis, including the sensitivity curves provided to the US team for review. The task force members discussed the need to analyze both nominal and worst-case scenarios, and to ensure the parameter ranges used are reasonable and aligned with the science case requirements. Further work is planned to incorporate the impact of suspension and cryogenic temperature on the noise budget.
Takeaways:
Valeria presented sensitivity curves for various scenarios, including:
Different filter cavity lengths
Temperature variations
Residual gas pressure changes
"Worst case" scenarios without filter cavities
Ongoing work on suspension thermal noise, input mode cleaner length impacts
Science case analysis of curves to be done by Francesco Ulana
Draft agenda for the Amsterdam meeting
15:25-15:35 CET
Point presented by: Fiodor Sorrentino
Point submitted for: information
Summary of discussion:
Fiodor presented a proposed agenda for the upcoming in-person meeting in Amsterdam, suggesting more time for plenary sessions and flexibility in the parallel session topics. The group discussed the need to focus on reducing tunnel volumes as a key cost driver, as well as adding dedicated sessions on tower integration and tunnel diameter optimization. There was also agreement to mark some parallel sessions as optional to allow for flexibility.
Takeaways:
Proposed 3-day agenda shared, with mix of plenary and parallel sessions
Focus on 2L detector layout, cavern volume reduction, system decomposition
Suggestions to:
Add session on tunnel diameter reduction
Mark some parallel sessions as optional/flexible
Include tower integration session
Software tool for civil engineering
15:35-15:50 CET
Point presented by: Wissam Wahbeh and Jonathan Bratanata
Point submitted for: information
Summary of discussion:
Wissam demonstrated a parametric model being developed to estimate civil engineering costs based on the detector layout. The tool allows for interactive exploration of how changes to the layout impact the calculated volumes and costs. The task force members agreed this would be a valuable tool to use during the Amsterdam meeting.
Takeaways:
Civil engineering cost estimation tool demonstrated:
Parametric model of caverns/volumes
Can calculate volumes and costs based on layout changes
To be expanded to include tunnels before Amsterdam
List of action items and glossary for Overleaf document
15:50-16:00 CET
Point presented by: Benoît Tuybens
Point submitted for: information
Summary of discussion:
Benoît provided an overview of the new action item tracking spreadsheet, and the glossary/acronym features added to the Overleaf document (by Nathan Holland). The task force members were encouraged to utilize these tools to maintain visibility and consistency in the work.
Takeaways:
Action item tracking spreadsheet set up
Glossary and acronyms functionality added to Overleaf document