Speaker
Mr
Danho Ahn
(Institute for Basic Science, Center for Axion and Precision Physics Research, KAIST)
Description
Maintaining high Q-factor of the superconducting cavity in a strong magnetic field at gigahertz frequencies is a crucial component in a highly sensitive axion detection system and at the same time, a largely unexplored and challenging task. The natural choice of material for the superconducting cavity to be placed in a high magnetic field is a high-temperature superconductor (HTS) with a high critical field (>100 T) and a high depinning frequency (>10GHz). The deposition, however, of a high-quality, grain-aligned HTS film on a three-dimensional surface is technically difficult. IBS/CAPP has fabricated a polygon-shaped resonant cavity with commercial YBCO tapes covering the entire inner wall and measured the Q-factor at 4 K at 6.9 GHz as a function of an external DC magnetic field. We present the microwave measurement of the YBCO cavity (TM010 mode) which shows that the Q factor of the cavity do not degrade until 8 Tesla. This result indicates the possibility of realizing a high Q-factor superconducting cavity in a high magnetic field for axion search.
Primary author
Mr
Danho Ahn
(Institute for Basic Science, Center for Axion and Precision Physics Research, KAIST)
Co-authors
Prof.
Dojun Youm
(KAIST)
Mr
Doyu Lee
(KAIST)
Dr
Jhinhwan Lee
(IBS CALDES)
Dr
Ohjoon Kwon
(Institute for basic science)
SungWoo YOUN
(CAPP/IBS)
Dr
Wonjun Jang
(IBS/QNS)
Dr
Woohyun Chung
(IBS/CAPP)
Prof.
Yannis Semertzidis
(IBS/CAPP)
