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Design Enhancements for the SNS RFQ Coaxial Coupler...

Publication Type
Conference Paper
Book Title
International Linear Accelerator Conference 2022 Proceedings
Publication Date
Page Numbers
469 to 472
Publisher Location
Geneva, Switzerland
Conference Name
31st International Linear Accelerator Conference 2022
Conference Location
Liverpool, United Kingdom
Conference Sponsor
Linear Accelerator Conference
Conference Date

The H⁻ ion linear accelerator at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory operates with reliability that routinely surpasses 90% during scheduled beam operation. With the ambitious goal of eventually achieving at least 95% availability, several upgrade and improvement projects are ongoing. One such project is the modification of the coaxial couplers that transfer radio frequency (RF) power to the accelerator’s Radio Frequency Quadrupole (RFQ). The proposed modification utilizes stub sections and capacitive coupling to construct a physically separable assembly with DC isolation. With a separated coupler assembly, the section that includes the magnetic coupling loop can be permanently mounted to the RFQ which would eliminate the need to re-adjust the couplers after maintenance activities, upgrades, and repairs. Additionally, the modified design would provide increased multipaction suppression with DC biasing and potentially lower thermal gradients across the device. This paper presents the design and simulation results of the project.