A vibration control system for components used in large accelerator facilities is being developed. This system will stabilize the function of the components and make the operation of the accelerator more efficient In continuous wave (CW) operations at facilities such as the Rare Isotope Accelerator (RIA), microphonically-induced vibration causes phase errors, and must be controlled by some form of fast-tuning. Spoke-loaded cavities have mechanical properties which make them more suitable for mechanical fast-tuning than the currently-used elliptical-cell structures. Based on feedback from end users, this project will design and demonstrate a compact spoke cavity tuning system. In Phase I, a prototype fast tuning actuator, based on a patented magnetostrictive material, was completed. In-house tests showed that the magnetostrictive actuator could perform reliably in a liquid helium environment, and the initial specifications for stroke, force, and operating frequency were achieved. Phase II will design and build a complete fast-response tuning system that meets more stringent specifications. In addition, a modular design will be developed for ready adaption to spoke cavities of different designs. Commercial Applications and Other Benefits as described by awardee: The new tuning system should benefit those groups who are using or planning to use spoke cavities in their facilities. The technology also should be useful in a wide range of applications that may require active vibration control. Examples include semiconductor processing equipment and many sensitive scientific instruments, such as different types of electron microscopes or interferometers
