Yao, Z.Y. Keir, J.J. Kolb, P. Kong, A. Laxdal, R.E. Matheson, B. Thoeng, E. Waraich, B.S. Zheng, Q. Zvyagintsev, V. JACoW Publishing Geneva, Switzerland 2226-0366 978-3-95450-194-6 10.18429/JACoW-LINAC2018-TUPO040 English 420-422 TUPO040 cavity TRIUMF LLRF controls niobium Contribution to a conference proceedings 2019 2019-01 https://doi.org/10.18429/JACoW-LINAC2018-TUPO040 http://jacow.org/linac2018/papers/tupo040.pdf A significant issue in low beta resonators is medium field Q-slope (MFQS) at 4K. To study the MFQS and the field dependence of surface resistance in low beta resonators, a quarter-wave resonator (QWR) and a half-wave resonator (HWR) were designed to be tested at integer harmonic frequencies of 200MHz, and up to 1.2GHz. A series of chemistry and heat treatments are proposed to these cavities. A systemic study on the surface resistance of the coaxial resonators associating with post-processing, RF field, and frequency is in progress. The cavities were designed and fabricated. The cold test results will be discussed in this paper.