The Superconducting Magnet for ADS Injection-I

TL;DR

This paper details the design, fabrication, and testing of superconducting magnets for the ADS Injection-I cryomodule, highlighting their multifunctional role, performance, and integration with cryogenic systems.

Contribution

It introduces a novel multifunction superconducting magnet design optimized for compactness, low leakage field, and integration with cryogenic systems in the ADS injector.

Findings

Magnets meet the required integral field strength.

Leakage field is less than 2 G near cavities.

Magnets operate reliably at 230A under cryogenic conditions.

Abstract

The cryomodule I for ADS Injection-I had been designed, fabricated and online tested. The CM1 contains seven superconducting magnets, seven superconducting spoke cavities and seven beam position monitors. The superconducting magnet, which is a kind of multifunction magnet in a 170mm length axial space, contains a solenoid for beam focusing and two correctors for orbit correction. The design goals for the magnets are to meet the required integral field strength and to reduce the leakage field of less than 2 G at the nearby superconducting spoke cavities. The 2.1K, 31 mbar cryogenic system, where the magnets and spoke cavities shared with, force the magnet must select a kind of conduction cooled current leads. The first one of the batch magnets was tested in a vertical Dewar in HIT in July, 2014. The measurement results met the design requirements. Online operation of CM1 in September, 2015 showed that seven magnets can work at 230A under 4.2K and 2.1K respectively. This paper will present the magnet and current lead design, field measurement and the installation progress.