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TY - CONF AU - Benedikt, M. AU - Bogomyagkov, A.V. AU - Holzer, B.J. AU - Jensen, E. AU - Levichev, E.B. AU - Ohmi, K. AU - Oide, K. AU - Shatilov, D.N. AU - Tomás, R. AU - Wenninger, J. AU - Wienands, U. AU - Zimmermann, F. ED - Henderson, Stuart ED - Akers, Evelyn ED - Satogata, Todd ED - Schaa, Volker R.W. TI - Combined Operation and Staging Scenarios for the FCC-ee Lepton Collider 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 - FCC-ee is a proposed high-energy electron positron circular collider that would initially occupy the 100-km FCC tunnel that will eventually house the 100 TeV FCC-hh hadron collider. The parameter range for the e⁺/e⁻ collider is large, operating at a cm energy from 90 GeV (Z-pole) to 350 GeV (t-tbar production) with the maximum beam current ranging from 1.5 A to 6 mA for each beam, corresponding to a synchrotron radiation power of 50 MW and a radiative energy loss varying from ~30 MeV/turn to ~7500 MeV/turn. This presents challenges for the rf system due to the varying rf voltage requirements and beam loading conditions. In this paper we present a possible gradual evolution of the FCC-ee complex by step-wise expansion, and possibly reconfiguration, of the superconducting RF system. The performance attainable at each step is discussed, along with the possible advantages and drawbacks. PB - JACoW CP - Geneva, Switzerland SP - 2169 EP - 2172 KW - emittance KW - luminosity KW - collider KW - optics KW - operation DA - 2015/06 PY - 2015 SN - 978-3-95450-168-7 DO - 10.18429/JACoW-IPAC2015-TUPTY061 UR - http://jacow.org/ipac2015/papers/tupty061.pdf ER -