ERMC RMM Design Status S Izquierdo Bermudez J

ERMC & RMM Design Status S. Izquierdo Bermudez, J. C. Perez, E. Rochepault– 02/09/2015 9/17/2020 1

General Status 1. 1 Review previous Nb 3 Sn Experience • • 3. 1 Preliminary Mechanical Design Review of the main mechanical/magnetic parameters of RMC/Fresca 2/HD Detailed analysis (See D. Schoerling) • 2. Preliminary Electromagnetic Design • 1. 2 Definition of main design parameters (including strand/cable) and constrains • • Definition of a first iteration parameters Update after results from 3. 1 & 3. 2 Parametric study of main magnet dimensions Select a couple of promising options for further analysis Legend: • Done • On-going • Pending 9/17/2020 3. 2 Detailed Magnetic Design • • Grading optimization 3 D Magnetic Analysis on grading options 2

Electromagnetic Design Most promising option: • 3 Decks Design (3 double pancakes) • ERMC and RMM using the same structure and coils ERMC RMM Next steps: • Optimization of the coil lay-out considering grading • Without grading coil width w ~ 100 mm. • Aiming at reducing to w ~ 70 mm Combining 1 mm – 0. 8 mm strands Promising Only 1 mm strands, but double layer on the LF Very difficult to manufacture • 3 D Magnetic Analysis and Conceptual Design of the splices needed for grading. 9/17/2020 3

Mechanical Design Aim: Outer radius < 780 mm Design Criteria (allowable stress in the components): as MQXF Parametric study on going to define the required dimension for the structural: 5 4 3 6 2 1 9/17/2020 Parameters explored: 1. Shell thickness 2. Horizontal interference/Bladders Pressure 3. Horizontal key position Next steps: 4. Horizontal pad thickness 5. Minimum size of the iron joke 6. Minimum size of the central post (this will have an impact on the coil magnetic optimization) 4

Additional slides

Design Parameters & Constrains • • Bo = 16 T at 4. 2 K with 10 % margin Strand: • • Cable: • • Maximum number of strands = 40 “Light constraint” Magnet Dimensions “Accelerator size” : • Coil w~70 mm • Outer magnet diameter < 800 mm Field Quality: • • • Available or easy to procure. Winding should start January 2017 bn due to saturation < 10 units “Light constraint” Quench Protection: • Tmax < 350 K using quench heaters + dump 9/17/2020 6

Baseline Strand Parameters Baseline Strand For First Iteration: • Strand diameter = 1 mm • Jc(12 T, 4. 2 K, wo self-field) = 3000 A/mm 2 • Bc 2(12 T, 4. 2 K) = 25 T • Cu 2 Sc ratio = 1. 0 -2. 0 • Cable packing factor ~ 80 % • Cable degradation = 5 % 9/17/2020 7

MQXF Criteria • • • Pole-coil contact in pole-turns midpoint pcont ≥ 2 MPa Max bladder pressure < 50 MPa Bladder should open the interf=interfnom + 100μm σeq coil max ≤ 150 -200 MPa at Material 4. 3 K and 155 T/m ≤ 100 MPa at 293 K Al 7075 All components σ ≤ Rp 0. 2 SS 316 LN For iron at 4. 3 K (brittle) NITRONIC 40 σI ≤ ~200 MPa 9/17/2020 Rp 0. 2 [MPa] 293 K 480 690 286 930 353 1240 MAGNETIL 180 723 Ti 6 Al 4 V 827 1654 8