Dresden 2026 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 9: RF Cavities I
AKBP 9.3: Vortrag
Mittwoch, 11. März 2026, 11:30–11:45, SCH/A117
Comparison of co-sputtered Nb3Sn thin films grown on copper, sapphire and fused silica — •Amir Farhood1, Alexey Arzumanov1, Márton Major1, Mohammad Khodakarami1, Amin Matin Javid1, Michaela Arnold2, Norbert Pietralla2, and Lambert Alff1 — 1Institute of Materials Science, Technical University of Darmstadt, — 2Institute of Nuclear Physics, Technical University of Darmstadt, Darmstadt, Germany
Pure Niobium is still the main choice for superconducting RF cavities; however, it must be operated at around 2 K, which significantly increases cooling requirements. Nb3Sn with a much higher Tc of approximately 18.2 K enables operation at 4.2 K. Applying Nb3Sn coatings onto copper cavities through co-sputtering is expected to enhance the quality factor and to suppress quenching at elevated accelerating fields. In this work, Nb3Sn layers were co-sputtered onto different substrates to examine their critical temperature and lower critical field (Hc1). Film growth was carried out under controlled conditions, followed by characterization through X-ray diffraction, resistivity measurements, and SQUID magnetometer. On all substrates, Nb3Sn exhibits a clear superconducting transition. For films deposited on r-cut sapphire, a Tc of 17.8 K was achieved, which is close to the value for bulk Nb3Sn. On copper, the films showed a Tc of about 15 K. Importantly, Hc1 exceeded not only that of bulk Nb3Sn but also that of pure niobium.
Keywords: Nb3Sn; SRF Cavity; Thin film; Co-Sputtering