CRYOMODULE COMPONENT DEVELOPMENT FOR THE APS UPGRADE SHORT PULSE X-RAY PROJECT*

The short pulse x-ray (SPX) part of the Advanced Photon Source Upgrade calls for the installation of a two- cavity cryomodule in the APS ring to study cavity-beam interaction, including HOM damping, cavity timing, and synchronization. Design of this cryomodule is underway at Jefferson Lab in collaboration with the APS Upgrade team at ANL. The cryomodule design faces several challenges including tight spacing to fit in the APS ring, a complex set of cavity waveguides including HOM waveguides and dampers enclosed in the insulating vacuum space, and tight alignment tolerances due to the APS high beam-current (up to 150 mA). Given these constraints, special focus has been put on modifying existing CEBAF Upgrade-style designs, including a cavity tuner and alignment scheme, to accommodate these challenges. The thermal design has also required extensive work including coupled thermal-mechanical simulations to determine the effects of cool-down on both alignment and waveguides. This work will be presented and discussed in this paper.