High-quality aerogel Cherenkov radiators recently developed in Japan

Around 1980, Japan’s High Energy Accelerator Research Organization, also known as the KEK laboratory, began developing silica aerogels a Cherenkov radiator. In 1996, high energy physics group at Chiba University, Japan, aerogel research and development in collaborating with KEK. The design of state-of-the-art detectors is enabled by improving transparency. Simultaneously, ultrahigh- ultralow-refractive-index were developed to bridge gap available indices for identifying low- high-momentum particles, respectively. These are will be employed ongoing future particle experiments all over world. We report latest results from applications threshold-type ring-imaging detectors.