Two-Dimensional Position-Sensitive Transition-Edge Sensor Microcalorimeters for Gamma Rays

A transition-edge sensor (TES) microcalorimeter has been developed to measure high-energy gamma-rays in the range of up to several MeV. We improve the positional resolution of a position-sensitive TES (PoST) for gamma rays according to the energy resolution and plan to develop a two-dimensional (2D) PoST. Therefore, we devise a method to achieve 2D-position detection using a one-dimensional PoST as a feasible proposal given the current stage of technology.