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TY - CONF AU - Hovater, C. AU - Babel, S. AU - Bachimanchi, R. AU - Chase, B.E. AU - Cullerton, E. AU - Doolittle, L.R. AU - Hong, B. AU - Huang, G. AU - Ratti, A. AU - Serrano, C. AU - Van Winkle, D. AU - Varghese, P. ED - Henderson, Stuart ED - Akers, Evelyn ED - Satogata, Todd ED - Schaa, Volker R.W. TI - The LCLS-II LLRF System J2 - Proc. of IPAC2015, Richmond, VA, USA, May 3-8, 2015 C1 - Richmond, VA, USA T2 - International Particle Accelerator Conference T3 - 6 LA - english AB - The SLAC National Accelerator Laboratory is planning an upgrade (LCLS-II) to the Linear Coherent Light Source with a 4 GeV CW superconducting (SCRF) linac. The SCRF linac consists of 35 ILC style cryomodules (eight cavities each) for a total of 280 cavities. Expected cavity gradients are 16 MV/m with a loaded QL of ~ 4x10⁷. The RF system will have 3.8 kW solid state amplifiers driving single cavities. To ensure optimum field stability a single source single cavity control system has been chosen. It consists of a precision four channel cavity receiver and RF stations (Forward, Reflected and Drive signals). In order to regulate the resonant frequency variations of the cavities due to He pressure, the tuning of each cavity is controlled by a Piezo actuator and a slow stepper motor. In addition the system (LLRF-amplifier-cavity) is being modeled and cavity microphonic testing has started. This paper describes the LLRF system under consideration, including recent modeling and cavity tests. PB - JACoW CP - Geneva, Switzerland SP - 1195 EP - 1197 KW - cavity KW - controls KW - LLRF KW - cryomodule KW - linac DA - 2015/06 PY - 2015 SN - 978-3-95450-168-7 DO - 10.18429/JACoW-IPAC2015-MOPWI021 UR - http://jacow.org/ipac2015/papers/mopwi021.pdf ER -