Keir, J.J. Harmer, P.R. Lang, D. Laxdal, R.E. Shishido, T. Smith, R. JACoW Geneva, Switzerland 978-3-95450-178-6 10.18429/JACoW-SRF2015-MOPB096 English 378-380 MOPB096 cathode cavity TRIUMF operation niobium Contribution to a conference proceedings 2015 2015-12 http://dx.doi.org/10.18429/JACoW-SRF2015-MOPB096 http://srf2015.vrws.de/papers/mopb096.pdf A setup for electropolishing of a superconducting niobium single-cell cavity has been installed at TRIUMF. A vertical method was selected to make the setup compact. To increase removal speed at the equator and remove hydrogen bubbles at the iris surface, 4 cathode paddles were rotated in the cavity cell during electropolishing. We will report on our first electropolishing result.