Nitrogen doping experiment of 1.3 GHz superconducting cavity [1.3 GHz 超导腔的掺氮实验]

作者：Dong C.; Sha P.^*; Liu B.; Li Z.; Yang J.; Wang H.

来源：High Power Laser and Particle Beams, 2020, 32(4): 045105.

DOI：10.11884/HPLPB202032.190141

• Accelerating
• gradient
• Nitrogen doping
• Quality factor
• Superconducting radio frequency
• Vertical test

In order to greatly improve the quality factor (Q) of a Nb superconducting cavity and reduce its power loss, we performed high-temperature nitrogen doping (N-doping) on the superconducting cavity, which is the most widely used method in the world. Based on the needs of large-scale accelerators at home and abroad, the Institute of High Energy Physics, Chinese Academy of Sciences, carried out researches on 1.3 GHz 1-cell superconducting cavities, including standard post-processing and N-doping. After data analysis and comparison, it can be found that the Q values of two 1.3 GHz 1-cell fine-grain superconducting cavities have been significantly improved. At the same time, the abnormal behavior of Q value depending on acceleration gradient (Eacc) was observed in low-temperature vertical test, which is called the "anti-Q-slope" phenomenon.

• 单位
  中国科学院大学