LHC BWS CONS - ad hoc meeting on LAB tests and design

Thursday 3 Sept 2026, 15:30 → 17:00 Europe/Zurich

865

Meeting on laboratory test campaigns and specific design modifications of the scanner (W. Andreazza and J. Emery)

1. We need to freeze the vessel design by the end of 2026 to meet the installation deadline of Q3 2027.
2. For the inner parts, freeze the design by March 2027. We have a little more room since fabrication will be quicker than for the vessel. This will give us more time to finalize the design and perform additional laboratory testing for validation.
• A: New card with clamping of the carbon wire.
• B: Decide on the electrical routing of the carbon wire measurement (resistive track, flex, etc.).
3. We need to restart the tests in Building 865. For this, we need to modify the LAB prototype:
• A: Install the final bearings.
• B: Install the electrical feedthrough.
• C: Install the ceramic card. For this, we agreed to install 2 additional wires at 5 mm on each side of the main wire. The 3 wires should have 3 different tensions: 30 g (nominal), 20 g, and 10 g — or 15 g if 10 g is not possible.
• D: New optical head with 90° fiber outputs.
• E: New optimized height of the arch above the optical system (lowering the ball screw closer to the flange).
• F: New card with carbon wire clamping.
4. Perform tests with the LAB prototype:
• A: Test wire vibration at 3 different wire tensions: perform calibrations and check oscillations.
• B: Test calibration stability before and after optical head removal.
• C: Test calibration stability before and after bakeout.
• D: Test calibration with the new card with wire clamping.
• E: Test the electrical continuity of the carbon wire tracks during scanning.
• F: Heat the resistive track to determine its temperature coefficient. Does it contribute to the resistivity variation at the parking position?