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TY - CONF AU - Kelly, M.P. AU - Barcikowski, A. AU - Carwardine, J. AU - Conway, Z.A. AU - Horan, D. AU - Kim, S.H. AU - Ostroumov, P.N. AU - Rathke, J. AU - Schultheiss, T. AU - Waldschmidt, G.J. ED - Henderson, Stuart ED - Akers, Evelyn ED - Satogata, Todd ED - Schaa, Volker R.W. TI - Superconducting Harmonic Cavity for the Advanced Photon Source Upgrade 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 - A new bunch lengthening cryomodule using a single-cell ‘higher-harmonic’ superconducting cavity (HHC) based on the TESLA shape and operating at the 4th harmonic (1408 MHz) of the main RF is under development at Argonne. The system will be used to improve the Touschek lifetime and increase the single-bunch current limit in the upgraded multibend achromat lattice of the Advanced Photon Source electron storage ring. The 4 K cryomodule will fit within one half of a straight section, ~2.5 meters, of the ring. The system will use a pair of moveable 20 kW (each) CW RF power couplers to adjust the loaded Q and extract power from the beam. This will provide the flexibility to adjust the impedance presented to the beam and run at various beam currents. Higher-order modes (HOMs) induced by the circulating electron beam will be extracted along the beam axis and damped using a pair of room temperature beam line absorbers. Engineering designs and the prototyping status for the cavity, power couplers and HOM absorbers are discussed. PB - JACoW CP - Geneva, Switzerland SP - 3267 EP - 3269 KW - cavity KW - HOM KW - photon KW - cryomodule KW - SRF DA - 2015/06 PY - 2015 SN - 978-3-95450-168-7 DO - 10.18429/JACoW-IPAC2015-WEPTY008 UR - http://jacow.org/ipac2015/papers/wepty008.pdf ER -