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TY - CONF AU - Xu, W. AU - Belomestnykh, S.A. AU - Ben-Zvi, I. AU - Hahn, H. ED - Belomestnykh, Sergey ED - Hoffman, Caitlin M. ED - Schaa, Volker RW TI - SRF Cavities for High Current ERLs J2 - Proc. of ERL2015, Stony Brook, NY, USA, June 7-12, 2015 C1 - Stony Brook, NY, USA T2 - ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs T3 - 56 LA - english AB - The electron-ion collider eRHIC, proposed at BNL, requires superconducting RF cavities, which are able to support high average current beams. Two types of ERL lattices were designed for eRHIC. The first one is a conventional lattice, and the other one is a non-scaling FFAG lattice, which was proposed recently. For the conventional lattice with up to eight ERL passes, a 704 MHz 5-cell BNL3 cavity was designed, fabricated and tested vertically at BNL. The FFAG-based eRHIC design requires a high-current low-frequency SRF energy recovery linac with up to 16 passes. A 422 MHz 5-cell cavity (BNL4) was designed for for this lattice. This paper addresses development of the SRF cavities for eRHIC, including the cavity design, fabrication and test results. Beam-break-up (BBU) analysis for these cavities is presented as well. An HOM damping scheme for achiving low higher-order-modes’ impedance is proposed. HOM couplers were designed for these high current SRF cavities. HOM coupler prototypes were fabricated and tested. PB - JACoW CP - Geneva, Switzerland SP - 72 EP - 71 DA - 2015/09 PY - 2015 SN - 978-3-95450-183-0 DO - 10.18429/JACoW-ERL2015-WEICLH2061 UR - http://jacow.org/ERL2015/papers/weiclh2061.pdf ER -