Characterization and long term operation of a novel superconducting undulator with 15 mm period length in a synchrotron light source

Abstract

A new cryogen-free full scale (1.5 m long) superconducting undulator with a period length of 15 mm (SCU15) has been successfully tested in the ANKA storage ring. This represents a very important milestone in the development of superconducting undulators for third and fourth generation light sources carried on by the collaboration between the Karlsruhe Institute of Technology and the industrial partner Babcock Noell GmbH. SCU15 is the first full length device worldwide that with beam reaches a higher peak field than what expected with the same geometry (vacuum gap and period length) with an ideal cryogenic permanent magnet undulator built with the best material available PrFeB. After a summary on the design and main parameters of the device, we present here the characterization in terms of spectral properties and the long term operation of the SCU15 in the ANKA storage ring.

Development and operating experience of a 1.1-m-long superconducting undulator at the Advanced Photon Source

“…Machine protection interlocks typically include beam loss monitoring and beam abort systems. For almost as long, but mostly in the past 10-12 years, superconducting magnets-SCUs [10,11], wigglers [23], and superbends [24]-have been employed for the generation of high-energy photons in electron synchrotron light sources. While all superconducting wigglers and SCUs have quench-detection interlocks to protect the magnet, very little has been written about characterizing and preventing beam-loss induced quenches.…”

“…Magnetic simulations suggest that superconducting undulators (SCUs) outperform other undulator technologies in terms of undulator peak field B for a given period length and magnetic gap [1][2][3]. As a result, superconducting undulators have the potential to significantly boost the brightness of high-energy x-ray beams, and therefore attracting the interest of the light source community in developing this technology [4][5][6][7][8][9][10].…”

Comparison of Achievable Magnetic Fields with Superconducting and Cryogenic Permanent Magnet Undulators – A Comprehensive Study of Computed and Measured Values

“…This 0.6-mm thickness will also be adopted for future SCUs at APS. At ANKA, a beam liner is used that allows for only a 1-mm difference between the vacuum and magnetic gaps [17].…”

Numerical Design Optimization of Short-Period HTS Staggered Array Undulators

“…For undulators based on the concept of wound coils, the advantage of using superconducting wires or tapes simply arises from the significantly increased current density and the reduction in resistive losses. So far, these concepts were mainly demonstrated with the use of LTS wires [2,3] whereas only a small number of research projects demonstrated undulator concepts with the use of HTS tapes and bulks [4,5].…”