Speaker
Ayaki Takeda
(Kyoto University)
Description
We have been developing monolithic active pixel detectors, "XRPIX", with the silicon-on-insulator (SOI) technology for future X-ray astronomical satellite missions. XRPIX is wide-band (0.3 – 40 keV) fine imaging spectrometer and the advantage is low background. Our objective performance are high coincidence time resolution (∼ 1 ${\rm \mu}$s), superior hit-position readout time (∼ 10 ${\rm \mu}$s) in order to reduce the non-X-ray background by cosmic rays. XRPIX contains comparator circuit in each pixel to detect an X-ray photon injection; it offers intra-pixel hit trigger (timing) and two-dimensional hit-pattern (position) outputs.
Therefore, it is capable of direct access to selected pixels to read out the signal amplitude. X-ray readout by this function is called ''Event-Driven readout''. By introducing an anti-coincidence method between the hit signal and the external active shield detector, the back ground can be greatly reduced. It realizes about 1 % of low background of CCD at 20 keV.
In our previous study, we developed prototype of XRPIX and demonstrated the acquisition of X-ray spectra in Event-Driven readout. The energy resolution are 900 eV (FWHM) for Frame mode and 1.2 keV (FWHM) for Event-Driven mode at 22.2 keV. And the readout noise is 68 e- (rms) for Frame mode.
Recently, we designed a new prototype which has charge sensitive amplifier (CSA) in each pixel in order to increase the gain and improve energy resolution. Then, the readout noise reached 33 e- (rms) and the energy resolution is about 300 eV (FWHM) at 5.9 keV. The Event-Driven X-ray readout by CSA circuit is under evaluation now. In this presentation, we report the present status of development focusing on spectrum performance.
Primary author
Ayaki Takeda
(Kyoto University)
Co-authors
Mr
Hideaki Matsumura
(Kyoto University)
Mr
Hiroki Kamehama
(Shizuoka University)
Dr
Keiichiro Kagawa
(Shizuoka University)
Dr
Keita Yasutomi
(Shizuoka University)
Dr
Koji Mori
(University of Miyazaki)
Mr
Ryota Takenaka
(University of Miyazaki)
Dr
Shinya Nakashima
(JAXA)
Prof.
Shoji Kawahito
(Shizuoka University)
Mr
Shrestha Sumeet
(Shizuoka University)
Dr
Takaaki Tanaka
(Kyoto University)
Dr
Takayoshi Kohmura
(Tokyo University of Science)
Prof.
Takeshi Tsuru
(Kyoto University)
Prof.
Yasuo Arai
(High Energy Accelerator Research Organization (JP))
Mr
Yusuke Nishioka
(University of Miyazaki)
