HTS Undulator Design Study and First Results

TL;DR

This paper presents the design and initial results of a compact superconducting undulator using HTS tapes, aiming to improve energy efficiency and magnetic performance for advanced X-ray sources.

Contribution

It introduces a novel superconducting undulator design with laser-scribed meander patterns and detailed design of the liner and cooling system.

Findings

Successful design of a compact HTS-based undulator

Implementation of laser-scribed meander pattern for current path

Initial results show promising magnetic and thermal performance

Abstract

Undulators are X-ray sources that are widely utilised in advanced synchrotron radiation sources and freeelectron laser facilities. Due to sustainability and energy efficiency, the development focuses on small-scale, high-field, and especially compact undulators with short period lengths ($\leq$ 10 mm) and narrow magnetic gaps ($\leq$ 4 mm). Therefore, hightemperature superconducting (HTS) tapes, which can provide a high critical current density and high critical magnetic fields at higher temperatures, are extensively used and investigated at the Karlsruhe Institute of Technology. A new concept of superconducting undulators (SCUs) was introduced and further developed by laser-scribing a meander pattern into the superconducting layer to achieve a quasi-sinusoidal current path through the HTS tape. Here we present the complete and final design of such a compact SCU, in particular our latest results regarding the design of the liner with its tapering in the warm region, as well as the cryogenic cooling concept.