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Bending radius limits of different coated REBCO conductor tapes - an experimental investigation with regard to HTS undulators

Richter, Sebastian C.; Schoerling, Daniel; Schlachter, Sonja I.; Drechsler, Antje; Ringsdorf, Bernd; Bernhard, Axel ORCID iD icon; Müller, Anke-Susanne

Compact FELs require short-period, high-field undulators in combination with compact accelerator structures to produce coherent light up to X-rays. Likewise, for the production of low emittance positron beams for future lepton colliders, like CLIC or FCC-ee, high-field damping wigglers are required. Applying high-temperature superconductors (HTS) in form of coated REBCO tape conductors allows reaching higher magnetic fields and larger operating margins as compared to low-temperature superconductors (LTS) like Nb-Ti or Nb~3~Sn.

However, short undulator periods like 13 mm may require bending radii of the conductor smaller than 5 mm which induce significant bending strain on the superconducting layer and may harm its conducting properties. In this contribution, we present our designed bending rig and experimental results for coated REBCO tape conductors from various manufacturers and with different properties. Investigated bending radii reach from 20 mm down to 1 mm and optionally include half of a helical twist. To represent magnet winding procedures, the samples were bent at room temperature and then cooled down to T = 77 K in the bent state to test for potential degradation of the superconducting properties.

Verlagsausgabe §
DOI: 10.5445/IR/1000133686
Veröffentlicht am 05.10.2021
DOI: 10.18429/JACoW-IPAC2021-THPAB042
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Beschleunigerphysik und Technologie (IBPT)
Laboratorium für Applikationen der Synchrotronstrahlung (LAS)
Publikationstyp Proceedingsbeitrag
Publikationsdatum 24.05.2021
Sprache Englisch
Identifikator ISBN: 978-3-95450-214-1
KITopen-ID: 1000133686
HGF-Programm 54.11.11 (POF IV, LK 01) Accelerator Operation, Research and Development
Erschienen in 12th International Particle Accelerator Conference : virtual edition, May 24th-28th, 2021, Brazil : proceedings volume / IPAC2021. Ed.: R. Picoreti
Veranstaltung 12th International Particle Accelerator Conference (IPAC 2021), Online, 24.05.2021 – 28.05.2021
Verlag JACoW Publishing
Seiten 3837-3840
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