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TY - CONF AU - Kelly, M.P. AU - Conway, Z.A. AU - Kedzie, M. AU - MacDonald, S.W.T. AU - Reid, T. AU - Wienands, U. AU - Zinkann, G.P. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Superconducting Harmonic Cavity for Bunch Lengthening in the APS Upgrade J2 - Proc. of SRF2019, Dresden, Germany, 30 June-05 July 2019 CY - Dresden, Germany T2 - International Conference on RF Superconductivity T3 - 19 LA - english AB - A superconducting cavity based Bunch Lengthening System is under construction for the Argonne’s Advanced Photon Source (APS) Upgrade. The system will reduce the undesirable effects of Touschek scattering on the beam lifetime by providing bunch lengthening in the longitudinal direction by 2-4 times. The major technical components for the beam-driven 1.4 GHz fourth harmonic superconducting cryomodule are in hand and have been tested. These include a superconducting cavity, cw rf power couplers, a pneumatic cavity slow tuner and beamline higher-order mode absorbers. Initial assembly and engineering testing of the cryomodule is underway. Final integrated testing will be complete in 2021. Transportation to and commissioning in the APS is planned for 2022-23. PB - JACoW Publishing CP - Geneva, Switzerland SP - 715 EP - 717 KW - cavity KW - HOM KW - cryomodule KW - photon KW - operation DA - 2019/08 PY - 2019 SN - "" SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-TUP102 UR - http://jacow.org/srf2019/papers/tup102.pdf ER -