Design and analysis of a HTS internally cooled cable for the Muon Collider target and capture solenoid magnets

TL;DR

This paper presents the design and analysis of a high-temperature superconductor (HTS) internally cooled cable for the Muon Collider's target and capture solenoid magnets, addressing radiation and thermal challenges in a high-field environment.

Contribution

It introduces a novel HTS cable design inspired by the VIPER concept, tailored for the Muon Collider's demanding radiation and thermal conditions.

Findings

The HTS cable design effectively manages radiation heat load and material damage.

The conceptual design ensures stability and protection of the superconducting magnets.

Addressed cooling and mechanical challenges specific to HTS cables in high-radiation environments.

Abstract

The Muon Collider is one of the options considered as the next step in High Energy Physics. It bears many challenges, last not least in superconducting magnet technology. The target and capture solenoid is one of them, a channel of approximately 18 m length consisting of co-axial solenoid magnets with a 1.2 m free bore and peak field on axis of 20 T. One of the main concerns come from the nuclear radiation environment that may influence the stable operation of the coil, as well as its material integrity. Energetic photons cause large radiation heat load, of the order of several kW in the cold mass, and deposit a considerable dose, several tens of MGy. Neutrons cause material damage, at the level of 10-3 DPA. These values are at the present limit of superconducting coil technology. We describe here the conceptual design of the target and capture solenoid, focusing on the HTS cable design, which is largely inspired by the VIPER concept developed at MIT. We show how to address margin and protection, cooling and mechanics specific to the HTS cable selected.