Hopper, C.S. Delayen, J.R. Park, H. Development and Testing of a 325 MHz beta0 = 0.82 Single-Spoke Cavity JACoW Geneva, Switzerland 978-3-95450-178-6 10.18429/JACoW-SRF2015-TUPB071 English 744-746 TUPB071 cavity linac vacuum impedance cryogenics Contribution to a conference proceedings 2015 2015-12 http://dx.doi.org/10.18429/JACoW-SRF2015-TUPB071 http://srf2015.vrws.de/papers/tupb071.pdf A single-spoke cavity operating at 325 MHz with geometric beta of 0.82 has been developed and tested. Initial results* showed high levels of field emission which limited the achievable gradient. Several rounds of helium processing significantly improved the cavity performance. Here we discuss the development process and report on the improved results.