X-ray computed tomography (CT) is a widely used diagnostic tool. However, the exposure dose of conventional CT in a single scan is large, typically 10 mSv, and therefore, reducing the radiation dose is a problem to be solved. Furthermore, conventional CT does not have the energy information of individual X-ray photon because the read out is an integrated pulse signal. Hence, it causes the...
Belle II experiment was successfully started. The first data for physics with full Belle II detector were taken in 2019 and 50ab$^{-1}$ data will be accumulated by 2027. A discussion of an upgrade plan for Belle II and SuperKEKB is started. The instantaneous luminosity by the upgraded SuperKEKB is 5 times larger than current design luminosity for SuperKEKB (8x10$^{35}$cm$^{-2}$s$^{-1}$) and...
We have been developing the X-ray SOI (Silicon-On-Insulator) pixel sensor named XRPIX for the future astronomical satellite FORCE. XRPIX is a monolithic active pixel sensor composed of high-resistivity Si sensor, thin SiO2 insulator and CMOS pixel circuits by utilizing the SOI technology. Since XRPIX is capable of event-driven readout, it can achieve a high timing resolution better than ∼10...
In HSTD11, we reported a SOI pixel sensor, SOFIST Ver.4, for the International Linear collider using 3D integration technology. In SOFIST4, we had integrated preamplifier, comparator and 3-stage charge and timestamp memories all within 20 $\mu$mm $\times$ 20 $\mu$m pixel area. This chip would satisfy the requirements for the linear collider vertex detector: the low hit occupancy, low material...
