Theoretical and experimental study of a new single-coil superconducting miniundulator

TL;DR

This paper presents the design, construction, and testing of a novel single-coil superconducting miniundulator, demonstrating its magnetic performance and operational limits through experimental and theoretical analysis.

Contribution

It introduces a new single-coil superconducting miniundulator design with detailed experimental validation and theoretical modeling.

Findings

Achieved a peak magnetic flux density of about 1 T.

Operation successfully reached currents slightly beyond 400 A.

Demonstrated the undulator parameter K of approximately 0.65.

Abstract

The first pre-prototype of a single-coil superconducting miniundulator has been built and studied. Its basic specifications include 10 main periods and two end compensation periods, a period length of 7 mm, and a gap of 2 mm. The design is based on a racetrack-like coil configuration that is subsequently compressed to form the gap region with the spatially alternating currents flowing perpendicularly to the electron beam above and below the midplane. Operation up to an excitation current slightly beyond 400 A before quenching resulted in a peak magnetic flux density on axis of about 1 T and an undulator parameter of K about 0.65.