The Japan Photonics Council visited Hamamatsu Photonics’ Central Research Laboratory during a tour. The actual large photomultiplier tubes used in IceCube and the company’s development efforts for next-generation Hyper-Kamiokande were introduced.
The Japan Photonics Council held a tour of Hamamatsu Photonics’ Central Research Laboratory on 23 October. The tour introduced the company’s contribution through optical detection technology to the realization of the IceCube Neutrino Observatory and the discovery of high-energy neutrinos originating in the universe, confirming that the laboratory explores optical technology across a wide range of fields, from basic to applied research.
During the tour, visitors were able to view at close range the large photomultiplier tubes, approximately 20 inches in diameter, used in Super-Kamiokande. It was explained that these PMTs detect and amplify faint light and capture the Cherenkov light produced when neutrinos interact with water. Measuring not only light intensity but also position and timing was described as important for detection.
The company’s efforts to develop and manufacture large PMTs for Hyper-Kamiokande were also introduced. Optical detection technology is expected to play an important role not only in neutrino research but also in future observation plans, including searches for proton decay.
The company is also advancing applications of optical technology in a wide range of fields, including agriculture and the environment, materials and healthcare. Research and development introduced during the tour included technology for diagnosing the nutritional condition of crops, medical technologies that could contribute to the diagnosis of cancer and dementia, and photodiodes made from thin organic semiconductors.