研究目的
Demonstrating practical accelerating gradients on a superconducting radiofrequency (SRF) accelerator cavity with cryocooler conduction cooling, eliminating the need for conventional liquid helium bath cooling.
研究成果
The study successfully demonstrated practical accelerating gradients on a conduction-cooled SRF cavity, achieving up to 6.6 MV/m at 100% duty cycle. This method simplifies the cryogenic infrastructure and makes SRF technology more accessible for compact, high average power electron beam sources. Future work aims to improve the cavity's quality factor and extend the technique to multi-cell cavities.
研究不足
The attainable accelerating gradient is limited by the cryocooler's cooling capacity and the quality factor of the cavity, which can be degraded by magnetic flux trapping. The system's performance is also affected by the magnetic hygiene of the test setup.
1：Experimental Design and Method Selection:
The design enables conduction cooling an elliptical-cell SRF cavity by coupling it to a 4 K pulse tube cryocooler using high purity aluminum thermal links.
2：Sample Selection and Data Sources:
A single cell 650 MHz Nb3Sn cavity was used, prepared by electropolishing and coated with a ~2 μm thick layer of Nb3Sn.
3：List of Experimental Equipment and Materials:
Cryomech PT420 two-stage pulse tube cryocooler, niobium rings, high purity aluminum thermal links, indium foil, silicon bronze screw, brass nut, stainless steel Belleville disc springs.
4：Experimental Procedures and Operational Workflow:
The cavity was cooled in 4.4 K liquid helium for baseline performance evaluation, then warmed and prepared for conduction cooling. The thermal link was bolted to the cavity niobium rings and the cryocooler's 4 K stage.
5：4 K liquid helium for baseline performance evaluation, then warmed and prepared for conduction cooling. The thermal link was bolted to the cavity niobium rings and the cryocooler's 4 K stage.
Data Analysis Methods:
5. Data Analysis Methods: Cavity quality factor (Q0) vs. accelerating gradient (Eacc) was measured using standard cavity measurement procedures, with temperature and power dissipation monitored.
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