Dr. Johannes Elbs Profile

Dr. Johannes Elbs

Research Fellow at Max-Planck-Institut Halbleiterlabor

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Publications (8)

Proceedings Article | 25 September 2012 Paper

Design and performance of the eROSITA focal plane instrumentation

Norbert Meidinger, Robert Andritschke, Florian Aschauer, Johannes Elbs, Tanja Eraerds, Stefanie Granato, Olaf Hälker, Gisela Hartner, Danilo Mießner, Daniel Pietschner, Peter Predehl, Jonas Reiffers, Lothar Strüder, Andreas von Kienlin, Sabine Walther

Proceedings Volume 8453, 84530P (2012) https://doi.org/10.1117/12.925367

KEYWORDS: Sensors, Cameras, Optical filters, Charge-coupled devices, Photons, X-rays, Signal processing, Electronics, Filtering (signal processing), X-ray telescopes

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Proceedings Article | 14 September 2011 Paper

Status of the CCD camera for the eROSITA space telescope

Norbert Meidinger, Robert Andritschke, Johannes Elbs, Stefanie Granato, Olaf Hälker, Gisela Hartner, Sven Herrmann, Danilo Miessner, Daniel Pietschner, Peter Predehl, Jonas Reiffers, Tanja Rommerskirchen, Gabriele Schmaler, Lothar Strüder, Lars Tiedemann

Proceedings Volume 8145, 814502 (2011) https://doi.org/10.1117/12.892403

KEYWORDS: Sensors, Charge-coupled devices, X-rays, Signal processing, Cameras, Photons, Electronics, X-ray telescopes, Optical filters, Space telescopes

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The approved German X-ray telescope eROSITA (extended ROentgen Survey with an Imaging Telescope Array) is the core instrument on the Russian Spektrum-Roentgen-Gamma (SRG) mission. After satellite launch to Lagrangian point L2 in near future, eROSITA will perform a survey of the entire X-ray sky. In the soft band (0.5 keV - 2 keV), it will be about 30 times more sensitive than ROSAT, while in the hard band (2 keV - 8 keV) it will provide the first complete imaging survey of the sky. The design driving science is the detection of 100,000 clusters of galaxies up to redshift z ~ 1.3 in order to study the large scale structure in the Universe and test cosmological models including Dark Energy. Detection of single X-ray photons with information about their energy, arrival angle and time is accomplished by an array of seven identical and independent PNCCD cameras. Each camera is assigned to a dedicated mirror system of Wolter-I type. The key component of the camera is a 5 cm • 3 cm large, back-illuminated, 450 μm thick and fully depleted frame store PNCCD chip. It is a further development of the sensor type which is in operation aboard the XMM-Newton satellite since 1999. Development and production of the CCDs for the eROSITA project were performed in the semiconductor laboratory of the Max-Planck-Institutes for Physics and Extraterrestrial Physics, the MPI Halbleiterlabor. By means of a unique so-called 'cold-chuck probe station', we have characterized the performance of each PNCCD sensor on chip-level. Various tests were carried out for a detailed characterization of the CCD and its custom-made analog readout ASIC. This includes in particular the evaluation of the optimum detector operating conditions in terms of operating sequence, supply voltages and operating temperature in order to achieve optimum performance. In the course of the eROSITA camera development, an engineering model of the eROSITA flight detector was assembled and is used for tests since 2010. Based on these results and on the extensive tests with lab model detectors, the design of the front-end electronics has meanwhile been finalized for the flight cameras. Furthermore, the specifications for the other supply and control electronics were precisely concluded on the basis of the experimental tests.

Proceedings Article | 14 September 2011 Paper

eROSITA

Peter Predehl, Robert Andritschke, Werner Becker, Hans Böhringer, Walter Bornemann, Heinrich Bräuninger, Hermann Brunner, Marcella Brusa, Wolfgang Burkert, Vadim Burwitz, Evgeniy Churazov, Konrad Dennerl, Josef Eder, Johannes Elbs, Michael Freyberg, Peter Friedrich, Maria Fürmetz, Roland Gaida, Fabrizia Guglielmetti, Olaf Hälker, Gisela Hartner, Frank Haberl, Sven Herrmann, Heinrich Huber, Eckhard Kendziorra, Andreas von Kienlin, Walter Kink, Ingo Kreykenbohm, Georg Lamer, Igor Lapchov, Norbert Meidinger, Andrea Merloni, Benjamin Mican, Joseph Mohr, Martin Mühlegger, Siegfried Müller, Kirpal Nandra, Mikhail Pavlinsky, Elmar Pfeffermann, Thomas Reiprich, Jan Robrade, Christian Rohé, Andrea Santangelo, Manami Sasaki, Gabriele Schächner, Christian Schmid, Jürgen Schmitt, Rainer Schreib, Fritz Schrey, Axel Schwope, Matthias Steinmetz, Lothar Strüder, Rashid Sunyaev, Chris Tenzer, Lars Tiedemann, Monika Vongehr, Jörn Wilms

Proceedings Volume 8145, 81450D (2011) https://doi.org/10.1117/12.893344

KEYWORDS: Mirrors, Cameras, Space telescopes, Telescopes, X-rays, CCD cameras, Electronics, Imaging arrays, X-ray telescopes, Manufacturing

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Proceedings Article | 29 July 2010 Paper

eROSITA on SRG

Peter Predehl, Robert Andritschke, Hans Böhringer, Walter Bornemann, Heinrich Bräuninger, Herman Brunner, Marcella Brusa, Wolfgang Burkert, Vadim Burwitz, Nico Cappelluti, Evgeniy Churazov, Konrad Dennerl, Josef Eder, Johannes Elbs, Michael Freyberg, Peter Friedrich, Maria Fürmetz, Roland Gaida, Olaf Hälker, Gisela Hartner, Günther Hasinger, Sven Hermann, Heinrich Huber, Eckhard Kendziorra, Andreas von Kienlin, Walter Kink, Ingo Kreykenbohm, Georg Lamer, Igor Lapchov, K. Lehmann, Norbert Meidinger, Benjamin Mican, Joseph Mohr, Martin Mühlegger, Siegfried Müller, Kirpal Nandra, Mikhail Pavlinsky, Elmar Pfeffermann, Thomas Reiprich, Jan Robrade, Christian Rohé, Andrea Santangelo, Gabriele Schächner, Thomas Schanz, Christian Schmid, Jürgen Schmitt, Reiner Schreib, Fritz Schrey, Axel Schwope, Matthias Steinmetz, Lothar Strüder, Rashid Sunyaev, Chris Tenzer, Lars Tiedemann, Monika Vongehr, Jörn Wilms

Proceedings Volume 7732, 77320U (2010) https://doi.org/10.1117/12.856577

KEYWORDS: Mirrors, Space telescopes, Telescopes, X-rays, Galaxy groups and clusters, Cameras, Spatial resolution, X-ray telescopes, Electronics, Charge-coupled devices

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Proceedings Article | 20 July 2010 Paper

Electronic test system for the eROSITA x-ray PNCCDs

J. Elbs, R. Andritschke, O. Hälker, R. Hartmann, S. Herrmann, N. Kimmel, N. Meidinger, L. Strüder

Proceedings Volume 7742, 774211 (2010) https://doi.org/10.1117/12.857269

KEYWORDS: Charge-coupled devices, Sensors, X-rays, X-ray imaging, Switches, Field effect transistors, Analog electronics, Ceramics, X-ray telescopes, Signal processing

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Proceedings Article | 17 July 2010 Paper

Quantum efficiency measurements of eROSITA pnCCDs

Stefanie Ebermayer, Robert Andritschke, Johannes Elbs, Norbert Meidinger, Lothar Strüder, Robert Hartmann, Alexander Gottwald, Michael Krumrey, Frank Scholze

Proceedings Volume 7742, 77420U (2010) https://doi.org/10.1117/12.856939

KEYWORDS: Quantum efficiency, Photons, Absorption, Sensors, X-rays, Aluminum, Signal attenuation, Silicon, Monochromators, Semiconductors

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Proceedings Article | 20 August 2009 Paper

CCD detectors for spectroscopy and imaging of x-rays with the eROSITA space telescope

N. Meidinger, R. Andritschke, S. Ebermayer, J. Elbs, O. Hälker, R. Hartmann, S. Herrmann, N. Kimmel, P. Predehl, G. Schächner, H. Soltau, L. Strüder, L. Tiedemann

Proceedings Volume 7435, 743502 (2009) https://doi.org/10.1117/12.825234

KEYWORDS: Sensors, Charge-coupled devices, X-rays, Space telescopes, Signal processing, Satellites, X-ray telescopes, Imaging spectroscopy, Cameras, CCD image sensors

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Proceedings Article | 15 July 2008 Paper

eROSITA camera design and first performance measurements with CCDs

N. Meidinger, R. Andritschke, J. Elbs, O. Hälker, R. Hartmann, G. Hasinger, S. Herrmann, P. Holl, N. Kimmel, S. Müller, P. Predehl, G. Schächner, H. Soltau, L. Strüder, L. Tiedemann

Proceedings Volume 7011, 70110J (2008) https://doi.org/10.1117/12.787793

KEYWORDS: Sensors, Charge-coupled devices, Cameras, X-rays, Electronics, CCD cameras, Digital signal processing, Signal processing, CCD image sensors, Space telescopes

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The German X-ray observatory eROSITA (extended ROentgen Survey with an Imaging Telescope Array) is the prime instrument of the new Spectrum-RG mission. Launch of the Russian satellite is planned for the year 2011. The scientific goal of eROSITA is primarily the detection and analysis of 100 thousand clusters of galaxies in order to study the large scale structures in the Universe and to test cosmological models. The therefore required large effective area is obtained by an array of seven identical and parallel aligned Wolter-I telescopes. In the focus of each mirror module, there is a large frame store pnCCD detector, providing a field of view of 1° in diameter. The same X-ray detector type will also be applied for ART-XC, another grazing-incidence telescope system aboard Spectrum-RG, which permits the detection of heavily obscured X-ray sources. These scientific instruments allow the exploration of the X-ray Universe in the energy band from 0.3 keV to 11 keV. During a mission time of at least five years, an all-sky survey, wide as well as deep surveys and pointed observations will be performed. Approval and funding for eROSITA were granted by the German space agency DLR in April 2007. The conceptual design of the X-ray focal plane cameras is presented here comprising electrical, thermal, and mechanical aspects. Key part of the camera is the pnCCD detector chip, which is developed and produced in our semiconductor laboratory, the MPI Halbleiterlabor. The CCD was designed according to the specifications given by the scientific goals of eROSITA. The eROSITA CCD differs apparently from all previously produced frame store pnCCDs by its larger size and format. The CCD image area of the seven eROSITA cameras is in total 58 cm² large and their number of pixels is about seven times higher than that of the XMM-Newton pnCCD camera. First pnCCD devices were recently produced and tested. Their performance measurements and results are of most importance for eROSITA because the tested CCDs are the control sample of the flight detector production.

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