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CESR has operated as a dedicated light source since the conclusion of colliding beam program in 2008. Two undulators with a 6.5mm-vertical gap were installed in Fall 2014, replacing a wiggler in the sextant of CESR that is the home to all CHESS beam lines. In order to operate narrow gap undulators with two beams, CESR pretzel lattice was redesigned so that e⁻ and e⁺ orbits are coincident in one machine sextant but separated in return arcs. In particular both e⁻ and e⁺ orbits are on axis throughdoi:10.18429/jacow-ipac2016-wepow053 fatcat:dx6ny24dejgfpmnfswh2jsfxhm