Introduction

• Arnaud Devred (CERN)

Room: 30/7-018 - Kjell Johnsen Auditorium - Guiding principles and methodology - Work organization

Novel visual, tomographic and metallographic inspections

• Stefano Sgobba (CERN)

Room: 30/7-018 - Kjell Johnsen Auditorium • 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

Assessing conductor limits

• Amalia Ballarino (CERN)

Room: 30/7-018 - Kjell Johnsen Auditorium • 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?

Assessing resin and insulation limits and improving electrical robustness

• Helene Felice (CERN)

Room: 30/7-018 - Kjell Johnsen Auditorium • 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

Improvement in coil manufacture

• Attilio Milanese (CERN)

Room: 30/7-018 - Kjell Johnsen Auditorium • Findings from review of tooling, manufacturing processes and quality control data • Improvements already implemented • Plan and timeline for further improvements and qualification

Improvement in magnet assembly

• Susana Izquierdo Bermudez (CERN)

Room: 30/7-018 - Kjell Johnsen Auditorium • 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

Improvement in cold mass assembly

• Herve Prin (CERN)

Room: 30/7-018 - Kjell Johnsen Auditorium • 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

New test and measurement techniques

• Stephan Russenschuck (CERN)

Room: 30/7-018 - Kjell Johnsen Auditorium • 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

Relevant feedbacks from MQXFA program

• Ezio Todesco (CERN)

Room: 30/7-018 - Kjell Johnsen Auditorium

Overall plan and timeline

• Ezio Todesco (CERN)

Room: 30/7-018 - Kjell Johnsen Auditorium

AOB Room: 30/7-018 - Kjell Johnsen Auditorium