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12-16 September 2005
University of Liverpool
Europe/Zurich timezone

DEPFET Active Pixel Sensors and pnCCDs for room temperature imaging (Xray) Spectroscopy in space missions and terrestrial astronomy

13 Sep 2005, 14:00
University of Liverpool

University of Liverpool

Greenbank Conference Park
Contributed Talk Applications in Astronomy and Astrophysics S5 : Applications in Astronomy and Astrophysics


Dr Johannes Treis (MPI Munich)


Two dimensional back-illuminated (500 µm sensitive thickness) X-ray pixel detectors with pixel sizes from 36 µm, 51µm, 75 µm to 150 µm have been developed for applications in X-ray astronomy (0.1 keV to 20keV) and for wave front sensing in adaptive optics systems up to 1 µm wavelength in the NIR. In both applications the environmental conditions are such that operation at ``warm temperatures´´ around -30o to -10o C is highly desired simultaneously to high readout speed and low noise operations. During our tests with device formats of 64×64 to 264×264 frame rates of up to 1.000 per second have been achieved with noise floors of 2.5 electrons (rms). For temperatures around - 20o C single stage Peltier cooler can be used, making the system compact and easy to use. The achieved energy resolutions with a pnCCD in the full imaging mode was 210 eV (FWHM) at the MnKá – line at 5.9 keV at - 100 C and with 75 µm pixels and a format of 256 × 128 being read out at 200 frames per second. The active pixels sensor DEPFET achieved at the same temperature with the same pixel size but with a format of only 64 × 64 and 300 frames per second an energy resolution of 150 eV only. pnCCD for wave front sensing with a format of 264 × 528 were operated at 1.000 frames per second and a noise of less than 3 electrons at - 400 C. The full set of measurements will be shown to taste the comfortable parameter space for applications in heaven and on earth.

Primary author

Prof. Struder Lothar (Max-Planck-Institut für extraterrestrische Physik)


Dr Johannes Treis (MPI Munich)

Presentation materials