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Description
The current concept of the final cooling segment of the Muon Collider requires a set of fourteen 40 Tesla solenoids with a free bore of 50 [mm] to reduce the transverse emittance of the beam. These solenoids are intended to be made of REBCO (rare-earth barium copper oxide), a high temperature superconductor (HTS). The solenoid is constructed as a stack of pancakes, all winded with a 12 [mm] wide REBCO tape. A key challenge in the design of such a high-field magnet is the management of mechanical stresses, generated by Lorentz forces acting on the coils and support structure, during normal operating conditions and in the case of a quench. The mechanical stresses are especially critical with this design, because of the very compact winding of the coils leading to a high overall current density of 700 [A/mm2]. The objective of this work is to obtain an accurate mapping of the Lorentz forces in the ANSYS Mechanical simulation software, to evaluate the mechanical integrity of the coils and investigate suitable materials and designs for the joints and structural supports. Electromagnetic simulations were performed using the in-house developed NICQS software (No-Insulation Coil Quench Simulator). Resulting Lorentz forces were mapped onto an ANSYS mesh through the ANSYS parametric design language (APDL) commands, which interacts directly with the ANSYS mechanical solver, to conduct mechanical simulations, including cooldown, energization and failure conditions. Mechanical simulations are performed on the current design layout of the 40 [T] final cooling solenoid, short sub-scale 10 [T] solenoids and sub-scale single pancake coils. These sub-scale pancakes were manufactured for dedicated characterization tests in background magnetic fields up to 20 [T], which require mechanical integrity studies prior to the tests being performed. Based on the results, the support structure and electrical terminals at the inner and outer radii of the pancake coils were improved by developing customized designs to meet varying experimental requirements. These findings strongly contribute to the development of reliable high-field experiments and the mechanical design for state-of-the-art superconducting magnets.
| What category does your poster fit in? | Muon Cooling |
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