The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - CONF AU - Pan, Z. AU - De Santis, S. AU - Hellert, T. AU - Steier, C. AU - Sun, C. AU - Tang, C.-X. AU - Venturini, M. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Beam-Loading Transients and Bunch Shape in the Operation of Passive Harmonic Cavities in the ALS-U J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - The ALS-U is a major upgrade of the LBNL ALS to a diffraction limited light source. The current plan is to replace all the vacuum and magnet components while retaining the existing 500 MHz main and third-harmonic, passively operated, rf cavities, but replacement of the existing rf cavities is also being considered. A new feature, is represented by beam-loading transients associated with a beam consisting of 11 bunch trains separated by 10 ns gaps as needed to enable on-axis swap-out injection. In this paper we study these transients and the associated bunch-to-bunch phase, length, and profile variations. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3298 EP - 3300 KW - cavity KW - simulation KW - beam-loading KW - impedance KW - controls DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-THPAK037 UR - http://jacow.org/ipac2018/papers/thpak037.pdf ER -