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TY - UNPB AU - Arsenyev, S. AU - Boulware, C.H. AU - Grimm, T.L. AU - Haynes, W.B. AU - Rogacki, A. AU - Shchegolkov, D.Y. AU - Simakov, E.I. AU - Tajima, T. AU - Temkin, R.J. ED - Yamazaki, Yoshishige ED - Facco, Alberto ED - McCausey, Amy ED - Schaa, Volker RW TI - Latest Cryogenic Testing of the 2.1 GHz Five-Cell Superconducting RF Cavity with a Photonic Band Gap Coupler Cell J2 - Proc. of LINAC2016, East Lansing, MI, USA, 25-30 September 2016 C1 - East Lansing, MI, USA T2 - Linear Accelerator Conference T3 - 28 LA - english AB - We present results from the latest of the two cryogenic tests with the first multi-cell superconducting radio frequency (SRF) cavity with a photonic band gap (PBG) coupler cell. Achieving higher average beam currents is particularly desirable for future light sources and particle colliders based on SRF energy-recovery-linacs (ERLs). Beam current in ERLs is limited by the beam break-up instability, caused by parasitic HOMs interacting with the beam in accelerating cavities. A PBG cell incorporated in an accelerating cavity can reduce the negative effect of HOMs by providing a frequency selective damping mechanism, thus allowing significantly higher beam currents. The multi-cell cavity was designed and fabricated of niobium. After an unsuccessful first cryogenic test, modifications were wade to waveguide coupler joints. In the second test, the high cavity Q-factor was demonstrated at the temperature of 4.2 K at accelerating gradients up to 3 MV/m. The measured value of the cavity Q-factor was 1.55*10⁸, in agreement with prediction. PB - JACoW CP - Geneva, Switzerland ER -