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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 16: Posters

AKBP 16.2: Poster

Donnerstag, 19. März 2020, 16:30–18:00, P1C

Mechanical and electromagnetic analysis of a quadrupole resonator under different loading conditions — •Shahnam Gorgi Zadeh, Pankajkumar Devganiya, Ursula van Rienen, and Piotr Putek — University of Rostock, Albert Einstein Str.2, 18059 Rostock, Germany

Most of the radio frequency (RF) cavities are nowadays made of superconducting materials, e.g. niobium. The surface resistance of superconductors at very low temperatures is typically in the range of tens of nano-ohms. Special dedicated devices are required to measure the extremely low surface resistance of superconductors. Quadrupole resonators (QPR) have been used since the 1990s for precise determination of the RF properties of superconducting materials. The QPR is typically composed of a pillbox-like niobium cavity containing four vertically placed niobium rods. By placing the superconducting samples under the rods and exciting a quadrupole-like magnetic field on the sample, the surface resistance could be investigated using calorimetric methods. The mechanical displacement of the rods can change the field distribution on the sample and thus affect the experiment setup. In this contribution the displacement of the rods under various mechanical loading conditions such as vacuum and helium pressure, as well as Lorentz force effects are studied. A sensitivity analysis is also carried out to find the sensitivity of the commonly used figures of merit of the QPR with respect to the shape of the rods.

This research is funded by the Bundesministerium für Bildung und Forschung (BMBF) under Grant No. 05H18HRRB1.