MCBXFB Short Orbit Corrector Prototype collaring test P

MCBXFB Short Orbit Corrector Prototype: collaring test P. Abramian, J. Calero, J. A. García Matos, P. Gómez, J. L. Gutierrez, D. Lopez, J. Munilla, F. Toral (CIEMAT) N. Bourcey, J. C. Pérez (CERN) WP 3 Meeting – 22 nd February 2017

Index § Collaring test § Update on project status § Conclusions 2

Magnet and cable specifications MCBXFB Technical specifications Magnet configuration Integrated field Minimum free aperture Nominal current Radiation resistance Physical length Working temperature Iron geometry Field quality Fringe field Combined dipole (Operation in X-Y square) 2. 5 Tm 150 mm < 2500 A 40 MGy < 1. 505 m 1. 9 K MQXF iron holes < 10 units (1 E-4) < 40 m. T (Out of the Cryostat) Cable Parameters No. of strands 18 Strand diameter 0. 48 mm Cable thickness 0. 845 mm Cable width 4. 37 mm Key-stone angle 0. 67º Cu: Sc 1. 75 Radiation resistance requires mechanical clamping Working point < 65% 3

Short mechanical model: concept • • • Essential to validate the assembly process and the mechanical simulations. A 120 Tm press available at CIEMAT workshop will be used to this end. A 150 -mm long set of collars will be closed. Aluminium dummy coils will be used for first tests. 4

Short mechanical model: design Outer collars tooling Inner collar tooling 5

Short mechanical model: instrumentation Four strain gauges per collars: on both sides of the collars and noses Strain gauges: three sections are monitored Four displacement gauges: micrometric precision 6

Short mechanical model: inner dipole assembly • • • At the minimum gap of 0. 2 mm, expected strain at the collar nose was about 530 μe, very close to the average of the measurements of the gauges (507 μe). The pressure is relieved so the inner dipole is left in its “spring-back” position. Calculated strain was 350 μe and the average of all measures is 343 μe. The collapsible mandrel is retired without effort form the inner dipole aperture. 7

Short mechanical model: outer dipole assembly • • • At the minimum gap of 0. 2 mm, expected strain at the collar nose was about 550 μe, not far from the average of the measurements (590). However, gauges in the lower half measured about one half of the upper ones. The coils have not tried to collapse inwards. Gaps are correct. Strain gauges are not equilibrated at the “spring back” position. Lower/male gauges indicate approximately twice the pressure than the upper/female ones. However the average is 424 μe, very close to the 385 μe expected from the simulation results. 8

Short mechanical model: outer dipole assembly • • • A mistake was detected in the geometry, at the contact between the male and female collars. When simulated in Ansys, the strain at the male and female collars is very different, 500 and 50 μe, respectively. It could explain the previous test results. We decided to exchange the instrumented collars, so collar packs were fully disassembled. 9

Short mechanical model: 2 nd outer dipole assembly • • • Surprisingly, the strain gauges measure similar values, but lower than expected (550). Assembly procedure was a bit different, which could explain the difference. For the time being, we plan to disassemble again the collar packs and repeat the test. 10

Index § Collaring test § Update on project status § Conclusions 11

Summary of last actions Fabrication techniques: ◦ CTD 101 K will be used instead of CTD 422. ◦ Curing of binder at high temperature (120 ºC) allows stability dimension of the cable stacks. Winding machine: ◦ All the components for the brake and wind-up machines are at our premises, ready for assembly. ◦ The beam and tilting system parts are under fabrication. Delivery foreseen in two weeks. ◦ Winding tooling: 3 D model finished, drawings under revision. Coil components: ◦ Copper wedges are fabricated by machining, expected by mid-March. ◦ End spacers are under fabrication, problems with the laser parameters. Binder mould: 3 D model finished, drawings ongoing. Some parts are common for both dipoles. Impregnation mould: 3 D model ongoing. 12

Conclusions § The inner dipole test was completely successful. The measured and calculated values were very close. The assembly procedure was easy to follow and no difficulties were detected. § In the first outer dipole test, measurements were close to the calculations in average, but large differences between the lower and upper halves were detected. When analysing the results, a mistake in the geometry was detected which could explain the behaviour. We decided to disassemble the collar packs and repeat the test. Surprisingly, the measurements are now well balanced, but they should not. § In summary, the configuration to hold the torque of the MCBX magnet is validated but some further tests are still necessary. 13

Final remark § In fact, we are developing two magnets in one. § The size of the apertures is impressive. 14

Back-up slides 15

Self-supporting collars Inner collar outer diameter = 230 mm (Thickness = 27 mm) Outer collar outer diameter = 316 mm (Thickness = 33 mm) 1 Outer Keys Handling supports Rivets 3 Interference 2 Torque locking Inner keys 4 Titanium Torque locking tube Press supports 16

Assembly gaps evolution A G B H I C Inner collars play = 0, 12 mm Outer collars play = 0, 1 mm J F All values in mm D E Gap Original gap ID Press ID Spring Back Before OD Press OD Spring back Cooldown 108% Power. A 0, 2 - - opens 0, 13 opens 0, 08 B 0, 1 - - opens 0, 085 contact C 0, 5 - - opens 0, 47 opens 0, 4 D 0, 55 0, 42 opens opens E 0, 3 0, 18 opens opens F 0, 03 ≅0, 03 contact contact G 0, 7 - - opens 0, 55 opens H 0, 6 - - opens 0, 45 opens I 0, 03 - - contact contact J 0, 5 - - 0, 43 0, 47 0, 465 opens 17