8th International Workshop on Semiconductor Pixel Detectors for Particles and Imaging.

Design and Development of an Event-driven SOI Pixel Detector for X-ray Astronomy and Light Dark Matter Search

Non in programma

20m

Sestri Levante

contributed paper

Relatore

Dr. Ayaki Takeda (Kyoto University)

Descrizione

We have been developing monolithic active pixel detectors, named “XRPIX” based on the silicon-on-insulator (SOI) pixel technology, for future X-ray astronomical satellite missions. Our objective is to replace X-ray Charge Coupled Devices (CCD), which are now standard detectors in the field. The XRPIX series offers good time resolution (~1 µs), fast readout time (~10 µs), and a wide energy range (0.5–40 keV) in addition to having imaging and spectroscopic capability comparable to CCDs. XRPIX contains a comparator circuit in each pixel for hit trigger (timing) and two-dimensional hit-pattern (position) outputs. Therefore, signals are read out only from selected pixels. X-ray readout by this function is called “event-driven readout”. In our previous studies, we successfully demonstrated X-ray detection by the event-driven readout. We improved the X-ray spectral performance by introducing in-pixel charge-sensitive amplifier circuit in the frame readout mode, which an analog signal from all pixels periodically. We achieved an energy resolution of 320 eV (FWHM) for 5.9 keV X-rays with which Mn-K${\rm \alpha}$ and -K${\rm \beta}$ lines are resolved for the first time in the XRPIX series. Recently, we designed the first prototype to achieve a large-area device for satellite loading. The detector is 24.6 mm × 15.3 mm in size and consists of 608 × 384 pixels. The pixel size and the imaging area are 36 μm × 36 μm and 21.9 mm × 13.8 mm, respectively. Moreover, We propose a light dark matter search experiment using the XRPIX. In this presentation, we report on the design and evaluation results of the new device, and the plan about a light dark matter search experiment.