  Recent developments in superconducting radio-frequency (SRF) research have
focused primarily on high frequency elliptical cavities for electron
accelerators. Advances have been made in both reducing RF surface resistance
and pushing the readily achievable accelerating gradient by using novel SRF
cavity treatments including surface processing, custom heat treatments, and
flux expulsion. Despite the global demand for SRF based hadron accelerators,
the advancement of TEM mode cavities has lagged behind. To address this, two
purpose-built research cavities, one quarter-wave and one half-wave resonator,
have been designed and built to allow characterization of TEM-mode cavities
with standard and novel surface treatments. The cavities are intended as the
TEM mode equivalent to the 1.3GHz single cell cavity, which is the essential
tool for high frequency cavity research. Given their coaxial structure, the
cavities allow testing at the fundamental mode and higher harmonics, giving
unique insight into the role of RF frequency on fundamental loss mechanisms
from intrinsic and extrinsic sources. In this paper, the cavities and testing
infrastructure are described and the first performance measurements of both
cavities are presented.
