HLLHC WP 3 meeting MQYYM Final Assembly Plan
HL-LHC WP 3 meeting MQYYM Final Assembly Plan proposal Damien SIMON, Hélène FELICE, Simon PERRAUD, Jean-Michel RIFFLET, Ricardo CORREIA MACHADO, Romain GODON (CEA) Juan Carlos PEREZ, Salvador FERRADAS, Sohrab EMAMI NAINI, Michael GUINCHARD, Gijs DE RIJK, Arnaud FOUSSAT (CERN) logo area 15/10/2019
Overview of MQYY activity logo area Physical length 1350 mm Magnetic length at 1. 9 K 1204 mm Outer diameter 360 mm Bare cable width 8. 8 mm Bare cable thickness 0. 77/0. 91 mm Insulation thickness at nominal 0. 080 mm Short sample current 5980 A Operating Gradient 120 T/m Operating current 4550 A Bpeak at operation 6. 42 T 2
STATUS
MQYYM Mechanical characterisation of the coils Coil 1 (reference coil) Corrected curves Prelaod would be: ≈160 MPa outer ≈130 MPa inner Initial collar cavity size (ie dummy coil size) logo area 4
MQYYM Mechanical characterisation of the coils Preload will be: ≈120 MPa outer ≈90 MPa inner Requires -0, 1 mm for coil 2 and for -0, 2 for other coils logo area Coil 2 -0, 1 mm de-shimming Coils 3, 8, 9 -0, 2 mm de-shimming 5
Shimming plan Proposal § Priority on prestress control for this model § Possible action: § Acting on protection sheet thickness + shim => less risky option (for electrical stand point and collaring action) § Removal on protection shoe § Acting on GPI Protection sheet nominal Protection sheet proposal Delta nominal vs proposal Coil 2 1 mm 316 L 0, 6 mm 304 L + 0, 3 mm kapton Cavity bigger by 0, 1 mm (0, 080 targeted) Coil 3, 8, 9 1 mm 316 L 0, 6 mm 304 L + 0, 2 mm kapton Cavity bigger by 0, 2 mm (0, 180 targeted) logo area 6
Longitudinal Results (for Coil 1) No shimming in the ends Lead End Return End Initial position (@3 MPa) and final position (@110 MPa) along the coil 1 0. 4 Displacement (mm) 0. 2 0 0 200 400 600 800 1000 1200 -0. 2 -0. 4 -0. 6 -0. 8 -1 -1. 2 Position of the measurment along the Coil 1 (mm) Initial position @3 MPa logo area • Final position @110 MPa Application length = 100 mm 7
MQYYM Collaring and instrumentation § Massaging + Insertion of the keys at 70% § Factor 2 between the strain read in the collars and the one expected due to the lack of collar nose Instrumented collars 0, 6 mm Protection shim Collars lamination Coi l sq in Pa ~230 MPa on measured collar Stress in the collars measured by the strain gages 120 MPa in coil logo area 8
MQYYM Collaring and instrumentation § Massaging + Insertion of the keys at 70% § Factor 2 between the strain read in the collars and the one expected due to the lack of collar nose Good agreement with the mechanical measurements Instrumented collars 0, 6 mm Protection shim Collars lamination Coi l sq in Pa Stress in the coil (2 time less than the stress measured in the collar) logo area ~230 MPa on measured collar 120 MPa in coil 9
Electrical Issue & Decollaring § Electrical tests after the collaring at 70%: Turn to turn short circuit detected => decision to decollar § Short disappears after decollaring of the LE § Location of the short circuit suspected to be between the pole turn and turn 2 § Crack starts observed in coils Coil 3 exhibits Reproduction of the short on the E modulus press Shear plane and cracks appear logo area 10
NEXT ASSEMBLY 11
COIL COMPARISON FOR NEXT ASSEMBLY 12
SHIMMING PLAN Remarks : • Coil 6 = similar to coil 2 • Coil 2 shimming reduction from previous assembly (0. 85 mm instead of 0. 9) Assembly 3 (collaring 2) Assembly 1 et 2 (collaring 1) Protection sheet nominal Protection sheet proposal Delta nominal vs proposal Coil 2 1 mm 316 L 0, 6 mm 304 L +0, 3 mm kapton Cavity bigger by 0, 1 mm (0, 080 targeted) Coil 3, 8, 9 1 mm 316 L 0, 6 mm 304 L +0, 2 mm kapton Cavity bigger by 0, 2 mm (0, 180 targeted) Same shimming for coil 2 and 6 : 0, 250 mm (2*125) Protection sheet nominal Protection sheet proposal Delta nominal vs proposal Coil 2 1 mm 316 L 0, 6 mm 304 L +0, 25 mm Kapton (2*125) Cavity bigger by 0, 15 mm Coil 8, 9 1 mm 316 L 0, 6 mm 304 L +0, 2 mm Kapton (2*125+50) Cavity bigger by 0, 2 mm (0, 180 targeted) Coil 6 1 mm 316 L 0, 6 mm 304 L + 0, 25 mm Kapton (2*125) Cavity bigger by 0, 15 mm 13
NEXT ASSEMBLY PROPOSAL C 8 A 1 C 1 B 4 C 7 C 2 2 9 A 4 8 A 2 6 C 6 Same size coils are placed in front of each other C 3 B 2 C 5 A 3 C 4 14
SHIMMING IN THE ENDS End parts Area without shimming Shimmed area Stress controled Area without End parts shimming Area where the stress could reach 160 +/-15 MPa 15
SHIMMING IN THE ENDS Over-stress area Suspected short circuit area Non-supported cable area Good stress area 16
NEXT ASSEMBLY POSSIBLE SOLUTIONS § Removed mid-plane insulation (too risky) § Machining the collaring keys locally at the level of the over-stress area (pb of delays and difficult to set up) § Continue as expected by looking at the forces in the jacks that insert the keys and stop the collaring if we exceed 150 Mpa in this area § Machining the keys slots of the finger-less collars above the critical area (delay pb and difficult to set up) § Insert a shim at the bottom of the notch of the finger-less collars above the critical zone (potential pb to mount the yoke laminations) § Remove two layers of GPI over the ends 17
NEXT ASSEMBLY PROPOSAL 18
NEXT ASSEMBLY PROPOSAL 19
NEXT ASSEMBLY PROPOSAL 20
NEXT ASSEMBLY PROPOSAL Proposition to create the Proposition Creation of a slope 21
SHIMMING IN THE ENDS End parts Area without shimming Shimmed area Stress controled Area without End parts shimming Area where the stress could reach 160 +/-15 MPa 22
SHIMMING IN THE ENDS End parts Not critical Shimmed area Stress controled End parts Not critical Stress controled… 23
First conclusions 1. The shimming plan in the straight part has been presented 2. The shimming plan in the ends have been presented and consist of: 1. remove two layers of the GPI insulation over the ends with smooth change of radius… 2. create of a slope in the insulated pole piece 3. Other proposition: Remove one full layer of GPI to decrease the overall stress. To be discussed logo area 24
Thanks for your attention logo area 25
- Slides: 25