The realization and characterization of a high quality factor resonator composed of two hollow-dielectric cylinders with its pseudo-TM030 mode resonating at 10.9 GHz frequency is discussed. The quality factor was measured at the temperatures 300 K and 4 K obtaining \mboxQ300\mboxK=(150,000±2,000) and \mboxQ4\mboxK=(720,000±10,000)respectively, the latter corresponding to a gain of one order of magnitude with respect to a traditional copper cylindrical-cavity with the corresponding TM010 mode resonating at the same frequency. The implications to dark-matter axion-searches with cavity experiments are discussed showing that the gain in quality factor is not spoiled by a reduced geometrical coupling C030 of the cavity mode to the axion field. This reduction effect is estimated to be at most 20%. Numerical simulations show that frequency tuning of several hundreds MHz is feasible.
@article{arxiv.2004.02754,
title = {Realization of a high quality factor resonator with hollow dielectric cylinders for axion searches},
author = {D. Alesini and C. Braggio and G. Carugno and N. Crescini and D. D' Agostino and D. Di Gioacchino and R. Di Vora and P. Falferi and U. Gambardella and C. Gatti and G. Iannone and C. Ligi and A. Lombardi and G. Maccarrone and A. Ortolan and R. Pengo and C. Pira and A. Rettaroli and G. Ruoso and L. Taffarello and S. Tocci},
journal= {arXiv preprint arXiv:2004.02754},
year = {2020}
}