Dresden 2026 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 9: RF Cavities I

AKBP 9.1: Talk

Wednesday, March 11, 2026, 11:00–11:15, SCH/A117

RF characterization of superconducting samples with the UHH QPR at DESY — •Carl Weiss¹, Ricardo Monroy-Villa², Manuela Schmökel³, Marc Wenskat^1,3, and Wolfgang Hillert¹ — ¹Institut für Experimentalphysik, Universität Hamburg — ²Institut für Kernphysik, Johannes Gutenberg-Universität Mainz — ³Deutsches Elektronen-Synchrotron DESY

Superconducting materials are indispensable for modern accelerators, for example highest acceleration fields are achieved with superconducting radio-frequency cavities made out of niobium. To further advance the development of superconducting materials for accelerators, an RF testing of samples is essential. The quadrupole resonator (QPR) is such a testing system, which allows the RF characterization of samples in the range of typical operational parameters of accelerators, such as a temperature range of 2-20 K, magnetic fields up to 120mT and for three different frequencies: 425 MHz, 860 MHz and 1300 MHz. In this report, the very first measurement of a sample in two different QPRs will be reported, which will proof the reliability and accuracy of such a system. Furthermore, fully exploiting the fact that the very same surface is tested at three different frequencies, the slow vs. fast superconductor model and non-equilibrium superconductivity will be investigated. This is of significant importance to study the so-called mid-T recipe developed for 1.3 GHz and test its transferability to other frequencies.

Keywords: Quadrupole Resonator; superconducting radio frequency; surface resistance; Niobium; Nb3Sn