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v3.3.4-pre
• Tomography (mainly useful for coil ends; findings on popped strands)
• Metallography combined with acid etching (x-section and longitudinal sections; mainly applicable on zones of interest which have been well delimited using other diagnostics, e.g.: quench start localization; findings on fractured strands and resin cracks/debonding)
• Plan and timeline to enable inspection of larger volumes of coils
• Micro-cracks vs. transverse pressure
• Ic and N-value vs. transverse pressure
• What is(are) the mechanism(s) for Ic and N-value
degradation?
• Plan and timeline to determine what are safe mechanical limits during assembly at room temperature and during energization at cryogenic temperatures?
• What are the relevant physical parameters of the various types of insulations found in a magnet coil (interturn insulation, interlayer insulation, resin rich areas, coil to quench heater insulation, ground plane insulation)?
• What are the mechanisms for degradation (debonding and cracking) and when do they occur?
• Plan and timeline to determine what are safe mechanical and thermal limits during assembly at room temperature, cooldown and operation at cryogenics temperatures?
• Improvements already implemented to improve mechanical and electrical robustness of insulation
• Plan and timeline for further improvements and qualification
• Findings from review of tooling, manufacturing processes and quality control data
• Improvements already implemented
• Plan and timeline for further improvements and qualification
• Findings from assembly of P1, P2 and 01 magnets (peak stress, stress unbalances, snaking)
• Update on mechanical measurements and finite element simulations
• Improvements on structure assembly (alignment and straightness)
• Optimization of keying and bladdering processes and validation on full-length mechanical prototype
• Findings from assembly of temporary cold masses of P1, P2 and 01
• New technical requirement regarding mechanically decoupling of outer stainless shell with respect to magnet structure
• New issue with fixed point between outer stainless-steel shell and magnet structure
• Outcome of March 31st review, Implementation and qualification plan
• assessment of coil performance with a short lead time (e.g., “upgraded” trim powering)
• new quench antenna system to enable 3D quench localization in coils without local voltage taps
• plan for V-I measurements on coils without local voltage taps