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TY - UNPB AU - Parker, B. AU - Palmer, R.B. ED - Zhao, Ning ED - Poole, John ED - Schaa, Volker RW TI - The eRHIC Interaction Region Magnets and Machine Detector Interface J2 - Proc. of eeFACT2016, Daresbury, UK, October 24-27, 2016 C1 - Daresbury, UK T2 - ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e^+e^- Colliders T3 - 58 LA - english AB - Designing eRHIC Interaction Region (IR) magnets faces special Machine Detector Interface challenges. Based upon HERA-II experience, a fundamental consideration is to avoid excessive background due to synchrotron radiation striking masks and septa in the vicinity of the experiment. Circumventing such radiation is problematic because the colliding beams have quite different rigidities; we must shield the e-beam from hadron IR magnet multi-tesla coil fields. On the outgoing-hadron, i.e. forward IR side, this difficulty is compounded by needing large hadron beam apertures to enable downstream separation and experimental detection of a mix of scattered and produced forward going charged particles and (in the electron-ion case) a wide-spread cone of neutrons. We adopt sweet spot, active shielding and passive shielding in designing magnets for two IR solutions. To study performance/risk tradeoff, BNL explores both the linac-ring and ring-ring design options. Linac-ring uses a multi-pass energy-recovery linac for the polarized e-beam; ring-ring injects polarized electrons into a full-energy storage ring. The corresponding beam parameters drive IR optimization to two different solutions. PB - JACoW CP - Geneva, Switzerland ER -