The paper titled "Demonstration of a 25-picosecond single-photon time resolution with gaseous photomultiplication" has been published in Nuclear Instruments and Methods in Physics Research Section A. This paper was authored by Associate Professor Kodai Matsuoka, Ryogo Okubo, and Yuya Adachi.
In particle physics experiments, photodetectors are widely used for detecting Cherenkov and scintillation light, and their better time resolution, larger photo coverage, and lower cost will be required to explore the frontier of particle physics. Gaseous photodetectors are expected to have these three features. In this study, the gaseous photomultiplier (GasPM) prototype was developed, and its time resolution was evaluated using a picosecond pulse laser. As a result, it was demonstrated that the GasPM prototype has a single photon time resolution of 25 ps at the gain of 3.3×10⁶. This study demonstrated the best time resolution among gaseous photodetectors, and it is the first step of the development for the practical use. In this study, Mr. Okubo and Mr. Adachi contributed significantly to the evaluation of the time resolution.

Paper information:
K. Matsuoka, R. Okubo, Y. Adachi,"Demonstration of a 25-picosecond single-photon time resolution with gaseous photomultiplication"
[Nucl. Instrum. Methods Phy. Res. A, 1053, 168378 (2023). DOI:10.1016/j.nima.2023.168378]