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Institut für Astronomie und Astrophysik

Abteilung Astronomie

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Preprint 17/12

UV MCP Detectors for WSO-UV: Cross Strip Anode and Readout Electronics

Sebastian Diebold (1), Jürgen Barnstedt (1), Stephan Hermanutz (1), Christoph Kalkuhl (1), Norbert Kappelmann (1), Marc Pfeifer (1), Thomas Schanz (1), Klaus Werner (1)

(1) Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics, University of Tübingen

To be published in: IEEE Transactions in Nuclear Science

Abstract. The main instrument of the WSO-UV satellite covers the wavelength range of 102 - 176 nm and 174 - 310 nm with two high resolution echelle spectrographs. The essential requirements for the associated detectors are high quantum efficiency, solar blindness, and single photon detection. To achieve this, we are developing microchannel plate (MCP) detectors in sealed tubes. It is planned to use cesium activated gallium nitride as semitransparent photocathode, a stack of two microchannel plates in chevron configuration, and a 33mm x 44mm cross strip anode with 64 horizontal and 64 vertical electrodes. This type of anode requires a lower gain of the MCPs (~106) compared to other types of anodes. Therefore, it extends the expected lifetime of the detectors to about five to ten years.
The challenge for the use of a cross strip anode onboard the WSO-UV satellite is the combination of contradictory constraints on the readout electronics: On the one hand it should be able to handle a maximum count rate of 3*105 s-1 with a spatial resolution better than 15 µm. On the other hand the power consumption is limited to about 8 W. One feasible solution is the so-called Beetle chip. This chip provides 128 input channels with charge-sensitive preamplifiers and shapers. It stores the sampled data temporarily in a ring buffer and multiplexes it to four analogue readout channels. The output is then digitized by four ADCs and processed in a radiation hard FPGA, which also contains the space-wire interface to the satellite bus.

Preprint (1,74 Mb PDF file including figures)

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