Abstract
A great majority of the Advanced Photon Source (APS) users have chosen an undulator as the only source for their insertion device (ID) beamline. Compared with a wiggler source, the undulator source has a much smaller horizontal divergence, providing us with an opportunity to explore the possibility to extract multiple beamlines from a single straight section of the APS storage ring. A one-milliradian deflection between the two beams is the optimal angle permitted given the configuration of the existing hardware (see Ref. 1). Based on the new APS front-end design for undulator-only operation (see Ref. 2), we have studied the feasibility of its modification for a one-milliradian canted double-undulator configuration. In this article, the designs and specifications, as well as the optical and bremsstrahlung ray-tracing analyses of the new APS front ends for canted double-undulator operation are presented. The compatibility of the original APS undulator/wiggler front ends with canted double-undulator operation is also discussed.
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