ETO Task Force meeting

Monday 15 Dec 2025, 14:30 → 16:00 Europe/Rome

https://cern.zoom.us/j/61274255815?pwd=2fwGbaMrZAYmUfpUfMCjKwpoYzPCKd.1

Meeting Purpose

Review document updates and set a timeline for the next release.

Key Takeaways

• Release Target: A new document release is targeted for January 16, 2025, bundling numerous error fixes and minor updates.
• Optical Layouts: Output tables 3 & 9 are being corrected for copy-paste errors and misassociations; drawings are updated with minor shifts to reflect substrate thickness.
• Science Case: The main document will be extended with a summary of supporting document findings, including a few key plots, to better explain the science impact of design changes.
• Future Work: A major overhaul of the naming convention (to distinguish unique vs. reused systems) and a more precise definition of environmental requirements are planned for future releases.

Topics

Document & Output Table Corrections

• GitLab Issue #9: Bundles numerous optical layout updates, primarily correcting copy-paste errors and misassociations in output tables 3 & 9.
  • Status: Most fixes are committed (marked orange); a few open points (marked purple) await final discussion with the squeezing group (Angelique, Antonio).
• Drawings: Updated to reflect minor shifts (mm-cm scale) from considering substrate thickness.
  • Distribution: New AutoCAD, 3D model, and PDF files will be uploaded to GitLab, EDMS, and Trimble.
• Other Tables:
  • Jonathan: Will update detector and civil output tables this week to ensure consistency with optical layout changes.
  • Romano: Will verify synchronization for integrated tower tables (2 & 8).
• Textual Errors: Minor fixes (typos, references) are tracked in GitLab Issue #21. The Overleaf log will be attached for full traceability, avoiding individual issues for each small change.

Future Work: Naming & Requirements

• Naming Convention Overhaul:
  • Problem: The current system treats reused components (e.g., input test masses) as unique, duplicating requirements and specs.
  • Solution: A new system will distinguish unique systems from reused instances.
  • Impact: Reduces unique systems from ~700 to ~200 (triangle case), improving scalability and reducing errors.
  • Scope: A major effort for a future release (not this one), requiring reformatting tables 1 & 7.
• Environmental Requirements:
  • Problem: Current requirements (e.g., temperature stability) are too broad and expensive to implement for large cleanrooms.
  • Solution: Specify requirements by location (e.g., optical bench) and operational mode (detector vs. maintenance).
  • Rationale: Based on Kagura experience, where a 15 kW ventilation shutdown caused a multi-degree temperature swing and filter failure. This highlights the need for localized, active thermal control.

Science Case Updates

• Main Document Expansion:
  • Action: Add a summary of supporting document findings to the main document.
  • Rationale: Addresses reviewer feedback that the current main document is too brief and doesn't showcase the full science analysis.
  • Content: A narrative summary with 1–2 key plots illustrating how specific instrumental changes affect science outcomes (e.g., mirror temperature vs. suspension tower length).
• Intermediate Mass Black Holes (IMBHs):
  • Status: Analysis was previously omitted due to population data bugs. New runs are finishing this week.
  • Decision: Ulyana will review the initial results. If promising, a subset will be included in the Jan 16 release; the full analysis will follow in a later release.
• Population Data Catalog:
  • Action: Create a catalog of population data on TDS.
  • Rationale: Addresses reviewer request for traceability.
  • Scope: TDS access (ET-only) is sufficient for this document release. A public release will be considered later for the related science paper.
• Geometry Comparison:
  • Decision: The document will not compare 2L vs. triangle geometries.
  • Rationale: This is outside the task force's mandate, which was to study the two layouts in parallel.

Next Steps

• Jonathan:
  • Finalize optical layout corrections with the squeezing group.
  • Update detector and civil output tables (this week).
  • Push updated drawings to GitLab, EDMS, and Trimble.
  • Complete document typo checks (this week).
• Romano:
  • Verify synchronization for integrated tower tables (2 & 8).
• Ulyana:
  • Draft the science case summary for the main document (by Jan 16).
  • Review IMBH analysis results and decide on inclusion for the release.
  • Create the population data catalog on TDS.
• Fiodor:
  • Draft more precise environmental control requirements.
  • Add non-OSD responses to the reviewer feedback document.
  • Find the original PDF submitted to the review committee to resolve page number discrepancies.
• All:
  • Close all assigned GitLab issues by January 16, 2025.
  • Prepare for the next release:
    • Benoit: Upload documents to EDMS.
    • Fiodor: Update the TDS entry and coordinate public release.

Action Items

• Verify Tables 2 & 8 sync w/ optical layout; fix if needed - WATCH (5 secs)
• Update Tables 5 & 11 re: environmental requirements; coordinate w/ Fiodor on expert input - WATCH (5 secs)
• Define and document location-specific environmental requirements w/ experts - WATCH (5 secs)
• Add science summary + 1–2 key plots to main doc; remove geometry-comparison sentence - WATCH (5 secs)
• Review IMBH subset results; decide on subset inclusion or full-set runs - WATCH (5 secs)
• Create ET-internal TDS catalog of populations/injections - WATCH (5 secs)
• Reshare reviewer-comment doc w/ editor access to Fiodor; Fiodor to add non-OSD replies - WATCH (5 secs)
• Recover early-May review PDF to resolve page/figure mismatches - WATCH (5 secs)
• Ask Benoit to collect and upload all updated docs to EDMS - WATCH (5 secs)

14:30 → 15:50 Analysis of light revisions

Convener: Fiodor Sorrentino (Istituto Nazionale di Fisica Nucleare)

15:50 → 16:00 A.O.B.