Updates on the Preliminary Electromagnetic and Mechanical Design of the Block-Coil Dipole for the Muon Collider Ring

Abstract

Within the framework of the International MuonCollider Collaboration (IMCC), a feasibility study is underway fora 10 km collider ring aiming to achieve 10 TeV of center-of-massenergy. The short muon lifetime (2.2 μs at rest) imposes stringentrequirements on the magnets, which must be compact, high-field,and large aperture to both maximize luminosity and host theinternal shielding for the muon decay products. These challengespoint to the use of REBCO High-Temperature Superconductors(HTS) and motivate the development of innovative design strategiesaddressing electromagnetic performance, quench protection, AClosses and mechanical integrity. This work presents an updated2D analysis of dipoles in a block-coil configuration for the muoncollider ring, featuring an innovative stacked-cable orientationwith a novel end-winding concept. An improved electromagneticdesign with a bore field of 16 T in a 140 mm aperture diameter isintroduced, accompanied by an analytical estimation of hystereticlosses, which now accounts also for transport current effects. Inaddition, an advancement of the preliminary mechanical designis provided through Finite Element Method (FEM) using ANSYSsoftware, employing a stress-management strategy to mitigate thehigh Lorentz forces.