Extension of the Measurement Capabilities of the Quadrupole Resonator

Abstract

The Quadrupole Resonator, designed to measure the surface resistance of superconducting samples at 400 MHz has been refurbished. The accuracy of its RF-DC compensation measurement technique is tested by an independent method. It is shown that the device enables also measurements at 800 and 1200 MHz and is capable to probe the critical RF magnetic field. The electric and magnetic field configuration of the Quadrupole Resonator are dependent on the excited mode. It is shown how this can be used to distinguish between electric and magnetic losses.

arXiv comment6 pages, g figures

References in corpus (3)

• Superheating field of superconductors within Ginzburg-Landau theory
• Temperature dependence of the superheating field for superconductors in the high-k London limit
• Losses in superconducting Niobium Films caused by Interface Tunnel Exchange

Cited by in corpus (7)

• Dependence of the microwave surface resistance of superconducting niobium on the magnitude of the rf field
• Critical Fields of Nb${}_3$Sn Prepared for Superconducting Cavities
• On the field dependent surface resistance of niobium on copper cavities
• Mitigation of parasitic losses in the quadrupole resonator enabling direct measurements of low residual resistances of SRF samples
• Coaxial multi-mode cavities for fundamental SRF research in an unprecedented parameter space
• Depinning of Trapped Magnetic Flux in Bulk Niobium SRF Cavities
• Experimental evidence for electric surface resistance in niobium