Mechanical measurement of MBRDS 1 magnet Mechanical Measurement

Mechanical measurement of MBRDS 1 magnet Mechanical Measurement Lab, EN/MME S. Emami Naini, M. Guinchard Co-workers: February 2019 § § § § A. P. Foussat P. Fabbricatore A. Bersani S. Farinon R. Cereseto B. Caiffi E. Todesco

Instrumentation Different parts of the magnet were instrumented : § Poles § Ring § Tie Rods § Bullet gauges Strain measurements using electrical resistive strain gages Azimuthal and longitudinal measurements on the ring and the poles Longitudinal measurements on the bullet gages and the tie rods S. Emami Naini, M. Guinchard 2

Time-line of the measurements § Collaring § Yoking § Assembly @ CERN § Bullet gages assembly 01/2019 02/2019 § Cool down § Quench tests § Warming S. Emami Naini, M. Guinchard 3

Bullet gages assembly § Axial loading of around 8000 N has been performed at CERN by INFN using Superbolts on tie rods, reading the compressive strain on bullet gages 02/2019 S. Emami Naini, M. Guinchard 4

Cool down – Ring strains § Little increase of strains in both directions, mainly in azimuthal 02/2019 S. Emami Naini, M. Guinchard 5

Cool down – Poles strains § Increase in azimuthal direction § Decrease in longitudinal direction 02/2019 S. Emami Naini, M. Guinchard 6

Cool down – Bullet gages strains § Bullets gages show tendency to compensate overall loads Data of 6 bullet gages are missing 02/2019 S. Emami Naini, M. Guinchard 7

Cool down – Tie Rods strains 02/2019 S. Emami Naini, M. Guinchard 8

Quench tests § Current 10. 21 k. A 02/2019 S. Emami Naini, M. Guinchard 9

Quench tests – Ring vs I 2 – Poles vs I 2 02/2019 S. Emami Naini, M. Guinchard 10

Quench tests – Bullet vs I 2 02/2019 S. Emami Naini, M. Guinchard 11

Quench tests – Tie rods vs I 2 § Within uncertainty of missing channels, we see an increase of 35 k. N on bullet gages and 42 k. N on Tie rods @ 10. 21 k. A 02/2019 S. Emami Naini, M. Guinchard 12

1 st Thermal cycle – Ring stresses § Recovery of Stress-strain values after warming 02/2019 S. Emami Naini, M. Guinchard 13

1 st Thermal cycle – Pole stresses § Recovery of Stress-strain values after warming 02/2019 S. Emami Naini, M. Guinchard 14

1 st Thermal cycle – Bullet stresses § Recovery of Stress-strain values after warming with 2 k. N of mean difference 02/2019 S. Emami Naini, M. Guinchard 15

1 st Thermal cycle – Tie rods stresses § Recovery of Stress-strain values after warming 02/2019 S. Emami Naini, M. Guinchard 16

Conclusion § The strain mechanical measurements have been performed in partnership with INFN and CERN MSC § Due to lack of time of industrial preparation within collaboration and knowledge transfer, some gages and info were lost during the assembly or later However : § Measurements in both azimuthal and longitudinal directions were done for almost all instrumented parts § Stress-Strain analysis of all parts was done for all steps of thermal cycle § Axial readings are good corresponding to simulation results § Ring results are consistent with simulation results § Pole results should be analysed in detail 02/2019 S. Emami Naini, M. Guinchard 17

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