Speaker
Description
The Southern Advanced Photon Source (SAPS) constitutes a 3.5 GeV fourth-generation storage ring. A full-energy linac injector based on a low-emittance C-band RF gun and C-band high-gradient accelerating structures (HGAS) has been proposed. To meet the engineering requirements for compactness and reliability, a compact C-band traveling wave accelerating tube has been designed and fabricated. The structure geometry is optimized to suppress the ratio of peak E-field and average E-field to reduce RF breakdown probability and increase shunt impedance. Specifically, the cavity shape and inter-coupling coefficients are refined to achieve a more uniform surface electric field. Cavity design and water cooling simulations have been conducted utilizing Superfish and CST, while RF parameters have been tuned using the resonant perturbation method, to obtain the S11 parameter being less than −50 dB . The prototype has successfully passed high-power testing, operating stably under rated conditions with an acceptable breakdown rate. This work demonstrates the feasibility of using such a compact, high-gradient C-band structure for the SAPS injector.
Funding Agency
The work is supported by the Guangdong Basic and Applied Basic Research Foundation (Grant No. 2020A1515110579)
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