Development of a Superconducting RF Multi-Spoke Cavity for Compact Light Sources
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AbstractSuperconducting radio frequency (SRF) accelerating cavities are being successfully used for acceleration of electron beams worldwide. The use of superconducting structures helps maximize the accelerating gradient, which is a highly desirable trait for applications involving linear accelerators or storage rings. Application of todays multi-spoke accelerating structures in future SRF electron linacs and storage rings will allow a further reduction in the overall size of acceleration sections without compromising its performance. Compact accelerators utilizing SRF cavities can be successfully used in the broad range of applications from x-rays machines for cancer therapy and sterilization, to tunable x-ray and gamma sources, to high energy electron accelerators and colliders. This SBIR proposal will develop a design of the 750 MHz superconducting multi-spoke cavity capable of accelerating electrons. The transverse size of the cavity is significantly reduced using the spoke geometry compared to the traditional elliptical accelerating structures. Phase I will demonstrate the technical feasibility of the project by completing the preliminary cavity and cryomodule designs. Phase II will finalize the design, then fabricate and test the SRF multi-spoke cavity. The cavity is designed to operate at 750 MHz and is capable of differential accelerating of electrons with electric and magnetic surface fields no more than ~50 MV/m and ~80 mT respectively. The cryogenic system operates at 4.2 K. The cryogenic load can be significantly reduced by operating in a pulsed mode or by reducing the overall accelerating voltage. Cryogenic tests will be carried out at Old Dominion University (ODU) and/or Thomas Jefferson National Laboratory (JLAB) to make use of their test facilities and cryogenics systems. Demonstration of this new type of SRF multi-spoke cavity creates many new possibilities for scientific and industrial applications
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