Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
AKBP: Arbeitskreis Beschleunigerphysik
AKBP 12: Radiofrequency and Instrumentation I
AKBP 12.5: Vortrag
Freitag, 4. April 2025, 10:00–10:15, ZHG004
Co-sputtering of Nb3Sn thin films on copper for superconducting HOM antenna application — •Amir Farhood1, Alexey Arzumanov1, Márton Major1, Paul Plattner2, Florian Hug2, Timo Stengler2, and Lambert Alff1 — 1Institute of Materials Science, TU Darmstadt, 64287 Darmstadt, Germany — 2Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55128 Mainz, Germany
For superconducting (SC) accelerators working in continuous wave (CW) mode the power coupled at the higher order mode (HOM) antennas is a power limiting factor. In particular, HOM antennas could quench in energy-recovery operation at high beam currents. Calculations showed that HOM antennas coated with a superconducting film can increase the possible maximal deposited power in HOMs. For this study a copper HOM antenna model was coated with SC Nb3Sn thin film by co-sputtering. The sputtering system was modified to achieve homogeneous coating of the three-dimensional antenna. Since stoichiometry plays a significant role on the critical temperature of the coating, the Nb to Sn ratio was checked by energy dispersive spectroscopy (EDS) measurements on test samples attached to different areas of the model antenna. The temperature dependence of resistivity and magnetization was measured on the test samples. A minimum critical temperature (Tc) of 13 K at every part of model was shown and on the top part of the antenna, where the heat load is the largest (Tc) of 14.5 K and critical field (Hc1) of 150 mT (at 5K) were achieved.
Keywords: Nb3Sn; Superconducting accelerators; HOM antennas; Co-sputtering; Thin film