Electron Beam Characterization of REBCO-Coated Conductors at Cryogenic Conditions

Particle accelerators with superconducting magnets operating at cryogenic temperatures use a beam screen (BS) liner that extracts heat generated by the circulating bunched charge particle before it can reach magnets. The BS surface, commonly made of high–conductivity copper, provides low impedance for stability reasons, secondary electron yield (SEY) to mitigate electron–cloud (EC) effect, and electron–stimulated desorption (ESD) limit dynamic pressure rise due EC. Rare–earth barium copper oxide (REBCO) high–temperature superconductors (HTSs) recently reached technical maturity, are produced as coated conductor tapes (REBCO–CCs), will be considered application in future colliders decrease enable operation around 50 K, consequently relaxing requirements. Aside from HTS properties, industry–grade REBCO–CCs also need qualification EC vacuum compatibility under accelerator–like conditions. Hence, we report SEY ESD measured 12 K low–energy irradiation 0–1.4 keV. We verify sample compositions morphologies using XPS, SEM, EDS methods. energy dose dependencies comparable those technical–grade metals one SEYMAX = 1.2 after conditioning.