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Outer Barrel

🛠️ Maintainers: Milou Van Rijnbach, Matthias Saimpert

🧾 Overview

Feedback from module loading during production is essential to understand which QC parameters are critical. This helps to refine, simplify, or adapt the module QC procedures.

This section collects the main topics currently under investigation based on observations from Outer Barrel (OB) module loading.

🧼 Module Backside Cleanliness

Impact of Parylene on Sensor Side

Status: Under evaluation

Investigations are ongoing to assess the impact on loading of potential contamination or impact due to parylene presence on the sensor-facing side of modules observed by some module QC sites

Impact of Vacuum Jig

Status: Under evaluation

Studies are examining whether the marks/residues left by vacuum jig used during module QC is an issue for loading

📏 Module Backside Flatness

Impact on Cell Conductivity

Status: Under evaluation

Possible correlation between backside flatness and proper connectivity/conductivity in loaded cells is being studied.

📊 OBWBP Electrical Resistance and Noise

Latest Observations (Reported by Susanne Kuehn, 28/07/2025)

  • A correlation study was performed between noise and canopy resistance on the first pre-production longeron.
  • All modules used had resistance values below 60 Ohm.
  • No strong correlation was observed in this first dataset. Since no high-resistance module was present, conclusions are still limited.
  • Two additional pre-production loaded local supports will be assembled in August–September 2025, using modules from all production sites. These are expected to provide more comprehensive insights.

Misplacement or non-planarity of OBWBP

  • A comment or flag will be added if canopies are out-of-specs. However, more details need to be provided to the module group when canopies are too misplaced that not all sites can any longer load them. Details will be added after further discussion between cell loading and module sites.

Labels on modules

  • Modules should have labels indicating the serial number, including M for module, production date and production cluster or site name.

Carriers

  • Carriers and modules will be disassembled in PDB in reception test of modules in cell loading sites or in reception test of module cells of combined flow in cell integration sites
  • Scratches in carrier bottoms will be covered with tape by module group
  • Flow of carriers in production: Cell loading sites ship carrier with OB bottoms and loaded cells and also module bottoms to Cell integration sites. Cell integration sites re-assemble module bottom and carrier to module carriers and ship it to OB module clusters (preferred sites will be defined, e.g. Bonn to German module cluster) and OB bottoms to cell loading sites.
  • Carriers and bottoms from pre-production to send to CERN and they will be re-assembled and distributed to OB sites (module clusters and cell loading sites)
  • (To be added)
Last update: 2025-11-28