Coupler Conditioning and High Power Testing of ADS Spoke Cavity

TL;DR

This paper details the development, testing, and successful high power performance of RF power couplers for China-ADS proton linac, demonstrating their capability to reliably transfer 10kW RF power.

Contribution

It presents the design, fabrication, and high power testing procedures of coaxial RF couplers for superconducting spoke cavities, achieving power levels exceeding initial specifications.

Findings

Couplers successfully transferred 10kW RF power in continuous mode.

Modifications improved out-gassing issues during high power tests.

Couplers met the design requirements after adjustments.

Abstract

Power couplers, used in China-ADS proton linac injector I, are required to transfer 6kW RF power to the superconducting Spoke cavities. At present, first two couplers of coaxial design have been fabricated and accomplished high power test at IHEP. The test results indicated that couplers of this design are qualified to deliver 10kW RF power in continuous travelling wave mode. This paper described the coupler's room temperature test procedures and results, discussed the original high power test terminated due to serious out-gassing and after some modifications. In the final test, the couplers smoothly exceeded the design power level.