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arXiv · 1701.03613

First functionality tests of a 64 x 64 pixel DSSC sensor module connected to the complete ladder readout

Mattia Donato·Karsten Hansen·Pradeep Kalavakuru·Manfred Kirchgessner·Markus Kuster·Matteo Porro·Christian Reckleben·Monica Turcato
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Abstract

The European X-ray Free Electron Laser (XFEL.EU) will provide every 0.1 s a train of 2700 spatially coherent ultrashort X-ray pulses at 4.5 MHz repetition rate. The Small Quantum Systems (SQS) instrument and the Spectroscopy and Coherent Scattering instrument (SCS) operate with soft X-rays between 0.5 keV - 6keV. The DEPFET Sensor with Signal Compression (DSSC) detector is being developed to meet the requirements set by these two XFEL.EU instruments. The DSSC imager is a 1 mega-pixel camera able to store up to 800 single-pulse images per train. The so-called ladder is the basic unit of the DSSC detector. It is the single unit out of sixteen identical-units composing the DSSC-megapixel camera, containing all representative electronic components of the full-size system and allows testing the full electronic chain. Each DSSC ladder has a focal plane sensor with 128 x 512 pixels. The read-out ASIC provides full-parallel readout of the sensor pixels. Every read-out channel contains an amplifier and an analog filter, an up-to 9 bit ADC and the digital memory. The ASIC amplifier have a double front-end to allow one to use either DEPFET sensors or Mini-SDD sensors. In the first case, the signal compression is a characteristic intrinsic of the sensor; in the second case, the compression is implemented at the first amplification stage. The goal of signal compression is to meet the requirement of single-photon detection capability and wide dynamic range. We present the first results of measurements obtained using a 64 x 64 pixel DEPFET sensor attached to the full final electronic and data-acquisition chain.

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Mattia Donato, Karsten Hansen, Pradeep Kalavakuru, Manfred Kirchgessner, Markus Kuster, Matteo Porro, Christian Reckleben, Monica Turcato. 2017-01-13. First functionality tests of a 64 x 64 pixel DSSC sensor module connected to the complete ladder readout. https://doi.org/10.1088/1748-0221%2F12%2F03%2Fc03025

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