Characterization of the 20 inch micro channel plate photomultiplier tubes

by Geonwoo Kim (MS Candidate)

Thursday May 19, 2022, 2:00 PM → 2:30 PM Asia/Seoul

119호 (제1과학관)

Cherenkov radiation refers to the radiation that is generated when charged particles travel in a medium and the speed of the particles is faster than the speed of light. To observe high-energy neutrinos by Cherenkov radiation, a very large amount of medium and large-area optical sensors are required. Korean Neutrino Observatory (KNO), a project proposed to detect neutrinos in Korea, is a observatory that in- stalls tens of thousands of optical sensors deep underground in a large water tank. The 20-inch micro channel plate photomultiplier tube (MCP-PMT) is one of the photosensor options for use in the KNO because of its advanced properties, which include a wide optical area and good collection efficiency. A closer examination of the characteristics of such a large-area PMT is an important study for KNO or other experiment that observing big Cherenkov radiation. We have studied the characteristics of two 20-inch MCP-PMTs including single photoelectron’s charge resolution, signal-to-noise ratio, gain, after-pulse ratio, dark count rate and timing performance. In addition, methods for measuring attributes has been devised and tested. Lastly, we compared the measurements of these characteristics with previous studies.

Thesis Advisor: Prof. Hongjoo Kim

000000101987_20221120173712.pdf