Speaker
Description
The on-line operating instability of the bulk Nb superconducting cavity is mainly attributed to the following factors: Lorentz force detuning, mechanical vibration, thermal breakdown induced by the electron loading effect and the enhanced heat dissipation at defects etc. Theoretically, the copper-niobium / aluminum-niobium composite superconducting cavities have excellent potential for high thermal and mechanical stability, which can make full use of the high-gradient surface processing recipes developed for the bulk niobium cavity, the thick copper/ aluminum layer’s high thermal conductivity and rigidity, thereby enhancing the operational stability of the bulk niobium cavities. In this contribution, we present the status of development of the CuNb composite and AlNb composite superconducting cavities at IMP, including the technical challenges, the RF and mechanical test results at cryogenic temperature, etc.
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