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High-temperature superconducting undulators for compact free-electron lasers, CLIC and FCC-ee
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Europe/Zurich
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Description
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Abstract:
Short-period and high-field undulators are crucial for the production of coherent light up to X-rays in compact free-electron lasers (FELs). Besides, future colliders like CLIC or FCC-ee demand high-field damping wigglers to reach a low beam emittance. Both applications may benefit from the use of high-temperature superconductors (HTS): magnetic field amplitudes in the range of ≥ 2 T become feasible for short periods ≤ 15 mm with magnetic gaps of 6 mm at 4.2 K. Moreover, potential operation at higher temperatures may relax cryogenic requirements and reduce operational costs.
In this talk, we want to present the investigations and developments over the last years on HTS undulator prototype coils, done within a collaboration between the Karlsruhe Institute of Technology (KIT), Germany, and CERN. The non-insulated HTS undulator coils were designed modularly with a period length of 13 mm and manufactured at CERN, wound from 4 mm wide coated REBCO tape superconductors. Powering tests were performed at 77 K at CERN and at 4.2 K at KIT to explore the operation up to high current densities (~2 kA/mm2) and the feasible magnetic fields in the magnetic gap.
Carlo Petrone
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