Three-Dimensional Niobium Coaxial Cavity with $\sim 0.1$second Lifetime

Takaaki Takenaka, Takayuki Kubo, Imran Mahboob +4

We report on the internal quality factor of a three-dimensional niobium quarter-wave coaxial cavity, with mid-temperature annealing, exhibiting $Q_{\mathrm{int}}\gtrsim 3\times 10^9$ at…