VS10 inspection results and definition of correction actions

Tuesday 26 May 2026, 16:00 → 18:00 Europe/Zurich

Processibility, Thermo-Mechanical Properties, and Radiation.pdf

RNC260421B - Corrective Actions.pdf

RNC260421B.pdf

• Accepted corrective actions
  • Assembly
    • Increase space between collaring shoes to 2 mm
    • Put systematically the patch of kapton all along the wedge
    • Better positioning of the quench heaters
  • Electrical testing:
    • Better grounding after each test, following 'best practices' from Roland
    • Add capacitive measurements
• Non accepted corrective actions
  • Electrical testing: reduce testing voltages to 2 kV
• To be discussed:
  • teflon coating on the collaring shoes
  • Repair of the coil defect. 
    • Discharge tests to be compared before and after failure

    • If discharge test are ok, cleaing with ethanol and visual inspection to discard big defect could be enough. One could also apply PU 820 f. PU are generally less radiation resistant than epoxies but during the collaring it will comply to the geometry and at it stays in place once the collaring process is completed and the magnet cooled.

• Procurement Stefania is unblocking the situation, maybe needs support from CERN to place orders
• Ground insulation is highly damaged, more than usual --> local repair we did removing only collar packs int he extremities is likely playing a role

• collaring shoe is getting in the midplane more than usual as well, again, likely due to the attemp to locally repair the defect. 

• Local discontinuities in the active part were found, defect is in #4.
  • QH will be shipped to CERN for further electrical testing