The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - CONF AU - Luo, T.H. AU - Baptiste, K.M. AU - Betz, M. AU - Byrd, J.M. AU - De Santis, S. AU - Kwiatkowski, S. AU - Persichelli, S. AU - Yang, Y. ED - Schaa, Volker RW ED - Power, Maria ED - Shiltsev, Vladimir ED - White, Marion TI - Beam Coupling Impedance Characterization of Third Harmonic Cavity for ALS Upgrade J2 - Proc. of NAPAC2016, Chicago, IL, USA, October 9-14, 2016 C1 - Chicago, IL, USA T2 - North American Particle Accelerator Conference T3 - 3 LA - english AB - The ALS upgrade to a diffraction-limited light source (ALS-U) depends on the ability to lengthen the stored bunches to limit the emittance growth and increase the beam life time. In order to achieve lengthening in excess of fourfold necessary to this end, we are investigating the use of the same passive 1.5 GHz normal-conducting RF cavities currently used on the ALS. While the upgraded ring RF parameters and fill pattern make it easier as long as the beam-induced phase transient is concerned, the large lengthening factor and the strongly non-linear lattice require particular attention to the cavities contribution to the machine overall impedance budget. In this paper we present our estimates of the narrow-band impedance obtained by numerical simulation and bench measurements of the cavities' resonant modes. PB - JACoW CP - Geneva, Switzerland SP - 167 EP - 169 KW - ion KW - impedance KW - cavity KW - HOM KW - coupling DA - 2017/01 PY - 2017 SN - 978-3-95450-180-9 DO - 10.18429/JACoW-NAPAC2016-MOPOB47 UR - https://jacow.org/napac2016/papers/mopob47.pdf ER -