120-mm superconducting quadrupole for interaction regions of hadron colliders

TL;DR

This paper presents the design and analysis of a 120-mm aperture Nb3Sn superconducting quadrupole magnet for hadron collider interaction regions, focusing on magnetic, mechanical, and radiation considerations.

Contribution

It introduces a novel magnet design with specialized spacers and detailed analysis of magnetic, mechanical, and radiation properties for collider applications.

Findings

Achieved specified magnetic field gradient and low harmonic distortion.

Demonstrated effective radiation heat management strategies.

Provided detailed mechanical support and pre-stress analysis.

Abstract

Magnetic and mechanical designs of a Nb3Sn quadrupole magnet with 120-mm aperture suitable for interaction regions of hadron colliders are presented. The magnet is based on a two-layer shell-type coil and a cold iron yoke. Special spacers made of a low-Z material are implemented in the coil mid-planes to reduce the level of radiation heat deposition and radiation dose in the coil. The quadrupole mechanical structure is based on aluminum collars supported by an iron yoke and a stainless steel skin. Magnet parameters including maximum field gradient and field harmonics, Nb3Sn coil pre-stress and protection at the operating temperatures of 4.5 and 1.9 K are reported. The level and distribution of radiation heat deposition in the coil and other magnet components are discussed.