High Sensitivity Beam Position Monitors for 1300 MHz Croyomodules

The proposed International Linear Collider will require a high-accuracy beam position monitor (BPM) at each quadrupole magnet to aid with beam alignment and as an input to feedforward schemes to cancel alignment errors. In order to meet the requirements of ILC, the BPMs will require sub-micron position resolution, fast transient response, and a relatively large clear aperture of 78 mm. FAR-TECH, Inc. proposes a dielectric-loaded BPM that uses a novel coupling scheme. These features allow the BPM to fit in a very small space of 2 inches. The dielectric loading also increases the cavity shunt impedance and allows greater sensitivity than a comparable bare cavity. Commercial Applications and Other Benefits: The International Linear Collider promises to shed new light on fundamental processes at the highest energy collision scales, and complement the physics program at the Large Hadron Collider. Sub-micron beam position measurements are crucial to beam emittance preservation and control in this machine. FAR-TECH, Inc. hopes to commercialize the BPM design and create one additional source of BPM systems for the eventual construction of the ILC and other high energy and nuclear physics applications. Two cavities will be tested and subsequently used as diagnostics for the Argonne Wakefield Accelerator upgrade.