Method for preparing transmission-type polyalkali photocathode by automatically baking residual alkali in combination with photocurrent monitoring

By combining automatic residual alkali drying with photocurrent monitoring, the fabrication process of transmission-type multi-alkali photocathode was dynamically optimized, solving the problems of insufficient cathode sensitivity and sensitivity decline after long-term storage, and achieving a significant improvement in cathode performance and stability.

CN120998756APending Publication Date: 2025-11-21NANJING SANLE GROUP
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Patent Information

Application Number
CN202511053447.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-30
Publication Date
2025-11-21

AI Technical Summary

Technical Problem

Existing transmission-type multi-alkali photocathode photomultiplier tubes do not achieve optimal cathode sensitivity after sealing, and their sensitivity tends to decrease after long-term storage, resulting in unstable performance.

Method used

By employing an automatic residual alkali drying method combined with photocurrent monitoring, the cathode activation state is dynamically optimized through staged temperature control and photocurrent feedback. Combined with vacuum environment optimization and residual alkali metal adsorption suppression technology, the cathode performance and stability are improved.

Benefits of technology

It improved cathode sensitivity by 40%, and the sensitivity decay rate after long-term storage is ≤5%, while shortening the residual alkali drying time by 20%-40%.

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Abstract

The invention discloses a method for preparing a transmission-type polyalkali photocathode by automatically drying residual alkali in combination with photocurrent monitoring. According to the method, through photocurrent feedback closed-loop control, photocurrent real-time monitoring and a residual alkali drying process are linked for the first time, and dynamic optimization of an activation state is realized; staged self-adaptive baking is adopted, baking stages are automatically switched based on photocurrent change characteristics, and over-baking or under-baking is avoided; an adsorption inhibition design is adopted, and the influence of residual alkali metal on the cathode is reduced through double means of temperature gradient and electric field regulation and control. The transmission-type polyalkali photocathode prepared by the invention has the advantages that the performance is improved, the sensitivity is improved by 40%, the sensitivity attenuation rate is less than or equal to 5% after the transmission-type polyalkali photocathode is stored for 3 months, and the residual alkali time is shortened by 20-40%.
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