15 T Demonstrator mechanical design analysis and optimization

15 T Demonstrator: mechanical design, analysis and optimization Igor Novitski Video Meeting 18 October 2016

Outline • • 2 Magnet concept evolution Models and Materials Design 1: C-Clamp Design 2: IC-Clamp “HD-2” structure optimization Design 3: AL Cylinder Summary Igor Novitski | Mechanical analysis October 18, 2016

Magnet Concept Evolution C-Clamp Magnet 3 Igor Novitski | Mechanical analysis I-Clamp Magnet Al Shell Magnet October 18, 2016

Geometry Comparison 15 T Dipole D 20 VMTF Dewar 4 Igor Novitski | Mechanical analysis October 18, 2016

FEA Models Coils in “HD 2” Structure C-Clamp Magnet I-Clamp Magnet 5 Igor Novitski | Mechanical analysis October 18, 2016

Material Properties Structural element Coil (rad/azim) In. coil pole blocks Out. coil pole blocks Wedges Coil-yoke spacer Clamp Yoke Skin 6 Material Nb 3 Sn composite Ti-6 Al-4 V St St Bronze St St Aluminum Iron St St 316 Igor Novitski | Mechanical analysis Thermal contract. (300 -2 K), mm/m 2. 9/3. 3 warm 35/20 cold 40/40 warm n/a cold n/a 1. 7 2. 9 3. 2 2. 9 4. 1 2. 0 2. 9 115 195 110 190 70 205 190 125 215 120 210 81 225 210 650 230 280 230 500 220 290 >900 500 350 500 700 580 Elasticity modulus, GPa Yield stress, MPa October 18, 2016

Design 1: C-Clamp+20 mm Skin, FEA Results 300 K Seqv=120 MPa Seqv=725 MPa 7 4 K 4 K+15 T Seqv=158 MPa Seqv=850 MPa Igor Novitski | Mechanical analysis Seqv=179 MPa Inner Pole Gap=0. 002 mm Seqv=880 MPa October 18, 2016

Design 2: IC-Clamp+12 mm Skin, FEA Model d Skin and skin thickness Yoke-Yoke gap taper Coil-Coil Rad interference X 1 Y 2 X 2 Clamp-Yoke angle and interference R Shell-Yoke Rad interference Step Y 1 Clamp-Skin Rad Yoke-Skin Rad interference Pole slot Mid-Plane shims 8 Igor Novitski | Mechanical analysis October 18, 2016

Design 2: IC-Clamp+12 mm Skin, FEA Results 300 K 9 4 K+15 T 4 K Seqv=133 MPa Seqv=176 MPa Spole=472 MPa Sskin=280 MPa Spole=724 MPa Sskin=404 MPa Igor Novitski | Mechanical analysis Seqv=168 MPa Inner Pole Gap=0 mm Syoke=448 MPa Sskin=428 MPa October 18, 2016

Design 2: IC-Clamp+12 mm Skin, FEA Results 300 K Seqv=115 MPa Seqv=118 MPa 10 Igor Novitski | Mechanical analysis 4 K Seqv=353 MPa Seqv=280 MPa 4 K+15 T Seqv=448 MPa Seqv=292 MPa October 18, 2016

AL Shell Design HD 2 11 Igor Novitski | Mechanical analysis 15 T Alternative October 18, 2016

Parametric Model of the Structure 1 2 3 4 Al Shell: 50 and 70 mm thick Iron Pad: 2 or 4 -piece Iron Yoke: 2 or 4 -piece 12 Igor Novitski | Mechanical analysis October 18, 2016

Design 3: 50 mm AL Cylinder, FEA Results 300 K Seqv=118 MPa 4 K+15 T 4 K Seqv=190 MPa Seqv=165 MPa Inner Pole Gap=0. 3 um 13 Igor Novitski | Mechanical analysis October 18, 2016

Design 3: 50 mm AL Cylinder, FEA Results 300 K 14 Igor Novitski | Mechanical analysis 4 K 4 K+15 T October 18, 2016

15 T Demonstrator Support Structures Baseline Igor Novitski | Mechanical analysis Alternative October 18, 2016

Comparison of Baseline and Alternative Designs Contact gaps at poles Al Shell at 15 T: Inner Pole Gap=0. 3 um (30%) Layer 3 pole Gap=4 um (15%) Baseline at 15 T: Inner Pole Gap =0 um Layer 3 pole Gap=7 um (20%) 16 Igor Novitski | Mechanical analysis October 18, 2016

Summary – Several concepts of mechanical structure have been analysed and compared. – Mechanical designs with IC-Clamps (Baseline) provides the required coil prestress and restricts turn radial, azimuthal and longitudinal motion for the operating current range up to 15 T. – Alternative magnet support structure based on a 50 mm thick aluminum shell, 4 -piece iron yoke and 2 -piece iron pad behave likewise. – Both structures allow keeping the stresses in the coil and support structure within acceptable limits during magnet assembly and operation. 17 Igor Novitski | Mechanical analysis October 18, 2016