VCI2016 - The 14th Vienna Conference on Instrumentation

Development of an Event-driven SOI Pixel Detector for X-ray Astronomy - Improvement of an Intra-chip Readout Circuit for Low Noise Performance -

Not scheduled

15m

Vienna University of Technology

Board: 2

Poster Astroparticle Detectors

Speaker

Ayaki Takeda (Kyoto University)

Description

We have been developing monolithic active pixel detectors, named “XRPIX” based on the silicon-on-insulator (SOI) pixel technology, for future X-ray astronomy 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. In our previous studies, we successfully demonstrated X-ray detection by the event-driven readout. We recently improved the X-ray spectral performance by introducing in-pixel charge-sensitive amplifier circuits and 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. We found that most of the readout noise can be attributed not to the sense-node but to the readout circuit. Thus, we designed a new prototype in which we modified the intra-chip readout circuits. In this presentation, we report on the recent development and evaluation results of the new device.

Presentation materials

20160216_vci2016_takeda_v2.pdf