Ms. Monika Vongehr Profile

Monika Vongehr

at Max-Planck-Institut für extraterrestrische Physik

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Publications (11)

Proceedings Article | 5 January 2018 Open Access

Development and verification of high precision cryogenic lens holders

C. Gal, E. Gubbini, H. Thiele, A. Mottaghibonab, T. Leberle, B. Hilber, M. Vongehr, A. Boesz, H. Gebler, T. Sedlmaier, A. Meister, M. Gerstmeier, A. Mecsaci, B. Kusch, F. Grupp, C. Wimmer, A. Bode, C. Bodendorf, D. Penka, R. Katterloher, N. Geis, R. Bender

Proceedings Volume 10563, 105634G (2018) https://doi.org/10.1117/12.2304246

KEYWORDS: Sensors, Cryogenics, Astronomical imaging, Interfaces, Photometry, Galactic astronomy, Diamond turning, Manufacturing, Spectroscopes, Baryon acoustic oscillations

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Proceedings Article | 22 July 2016 Paper

Gluing interface qualification test results and gluing process ‎development of the EUCLID near-infrared spectro-photometer optical ‎assembly

A. Mottaghibonab, H. Thiele, E. Gubbini, M. Dubowy, C. Gal, A. Mecsaci, K. Gawlik, M. Vongehr, F. Grupp, D. Penka, C. Wimmer, R. Bender

Proceedings Volume 9912, 991260 (2016) https://doi.org/10.1117/12.2232767

KEYWORDS: Interfaces, Adhesives, Cryogenics, Optical fabrication, Titanium, Metals, Glasses, Polarimetry, Manufacturing, Optical inspection

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The Near Infrared Spectro-Photometer Optical assembly (NIOA) of EUCLID satellite requires high precision large lens holders with different lens materials, shapes and diameters. The aspherical lenses are glued into their separate CTE matched lens holder. The gluing of the lenses in their holder with 2K epoxy is selected as bonding process to minimize the stress in the lenses to achieve the required surface form error (SFE) performance (32nm) and lens position stability (±10μm) due to glue shrinkage. Adhesive shrinkage stress occurs during the glue curing at room temperature and operation in cryogenic temperatures, which might overstress the lens, cause performance loss, lens breakage or failure of the gluing interface.

The selection of the suitable glue and required bonding parameters, design and qualification of the gluing interface, development and verification of the gluing process was a great challenge because of the low TRL and heritage of the bonding technology. The different material combinations (CaF2 to SS316L, LF5G15 and S-FTM16 to Titanium, SUPRASIL3001 to Invar M93), large diameter (168mm) and thin edge of the lenses, cryogenic nonoperational temperature (100K) and high performance accuracy of the lenses were the main design driver of the development. The different coefficients of thermal expansion (CTE) between lens and lens holder produce large local mechanical stress. As hygroscopic crystal calcium fluoride (CaF2) is very sensitive to moisture therefore an additional surface treatment of the gluing area is necessary.

Extensive tests e.g glue handling and single lap shear tests are performed to select the suitable adhesive. Interface connection tests are performed to verify the feasibility of selected design (double pad design), injection channel, the roughness and treatment of the metal and lens interfaces, glue thickness, glue pad diameter and the gluing process. CTE and dynamic measurements of the glue, thermal cycling, damp- heat, connection shear and tension tests with all material combinations at RT and 100K are carried out to qualify the gluing interface. The gluing interface of the glued lenses in their mounts is also qualified with thermal cycling, 3D coordinate measurements before and after environmental tests, Polarimetry and vibration test of the lens assemblies.

A multi-function double pad gluing tool and lens mounting tool is designed, manufactured and verified to meet the lens positioning and alignment performance of the lens in the holder which provides the possibility to glue lenses, filters, mirrors with different diameters, shapes and thickness with ±10μm accuracy in plane, out of plane and ±10 arcsec in tip/tilt with respect to the lens holder interface. The paper presents the glue interface qualification results, the qualification/verification methods, the developed ground support equipment and the gluing process of the EUCLID high precision large cryogenic lens mounts. Test results achieved in the test campaign demonstrate the suitability of the selected adhesive, glue pad design, interface parameters and the processes for the precise gluing of the lenses in lens holders for all lenses. The qualification models of the NIOA are successfully glued and qualified. The developed process can also be used for other glass materials e.g. MaF2 and optical black coated metallic surfaces.

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 | 1 August 2010 Paper

Hot slumping glass technology for the grazing incidence optics of future missions with particular reference to IXO

M. Ghigo, S. Basso, M. Bavdaz, P. Conconi, O. Citterio, M. Civitani, P. Friedrich, D. Gallieni, B. Guldimann, F. Martelli, R. Negri, G. Pagano, G. Pareschi, G. Parodi, L. Proserpio, B. Salmaso, F. Scaglione, D. Spiga, G. Tagliaferri, L. Terzi, M. Tintori, M. Vongehr, E. Wille, A. Winter, A. Zambra

Proceedings Volume 7732, 77320C (2010) https://doi.org/10.1117/12.857577

KEYWORDS: Glasses, Mirrors, X-rays, Silica, X-ray optics, Integrated optics, Observatories, Atomic force microscopy, Thermography, Platinum

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Proceedings Article | 29 July 2010 Paper

Light weight optics made by glass thermal forming for future x-ray telescopes

Anita Winter, Monika Vongehr, Peter Friedrich

Proceedings Volume 7732, 77320B (2010) https://doi.org/10.1117/12.857147

KEYWORDS: Glasses, Silica, X-ray optics, X-ray telescopes, Mirrors, Oxides, Polishing, Thermography, Metrology, 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 | 15 July 2008 Paper

Development of slumped glass mirror segments for large x-ray telescopes

Monika Vongehr, Peter Friedrich, Peter Predehl, Heinrich Bräuninger

Proceedings Volume 7011, 701115 (2008) https://doi.org/10.1117/12.789326

KEYWORDS: Glasses, Mirrors, Metals, X-rays, X-ray telescopes, Metrology, Sensors, Ceramics, Surface finishing, Polishing

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Proceedings Article | 20 September 2007 Paper

Experimental results on slumped glass x-ray mirror segments

Monika Vongehr, Peter Friedrich, Heinrich Bräuninger, Werner Lieb, Maria Fürmetz, Alexandra Mazur, Klaus Veit, Peter Ettl, Xavier Laboureux

Proceedings Volume 6688, 66881A (2007) https://doi.org/10.1117/12.734276

KEYWORDS: Glasses, X-rays, Mirrors, X-ray telescopes, Metrology, X-ray optics, Ceramics, Prototyping, Deflectometry, Annealing

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Proceedings Article | 13 June 2006 Paper

Manufacturing of Wolter-I mirror segments with slumped glass

Peter Friedrich, Bernd Aschenbach, Christoph Braig, Heinrich Bräuninger, Bernd Budau, Wolfgang Burkert, Michael Freyberg, Gisela Hartner, Günther Hasinger, Peter Predehl, Monika Vongehr, Stefano Basso, Oberto Citterio, Mauro Ghigo, Francesco Mazzoleni, Giovanni Pareschi, Udo Dinger, Wilhelm Egle, Ralf Lenke, Georg Luichtel, Herbert Schwarz

Proceedings Volume 6266, 62661G (2006) https://doi.org/10.1117/12.671802

KEYWORDS: Glasses, Mirrors, Image segmentation, X-rays, Spatial resolution, Manufacturing, Metrology, Error analysis, Point spread functions, Profilometers

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Proceedings Article | 25 April 2006 Paper

Development of a metrology to characterize EUV optics at 13.5nm

Monika Vongehr, Peter Predehl, Günter Hasinger

Proceedings Volume 6187, 618709 (2006) https://doi.org/10.1117/12.662816

KEYWORDS: Sensors, Extreme ultraviolet, Silicon, Mirrors, Metrology, X-rays, EUV optics, Microchannel plates, Calibration, X-ray detectors

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Proceedings Article | 8 September 2005 Paper

Results from a contamination experiment on the ISS

Peter Friedrich, Peter Predehl, Norbert Meidinger, Lothar Strüder, Monika Vongehr, Wolfgang Burkert, Michael Freyberg, Gisela Hartner, Heinrich Bräuninger, Günther Hasinger, Stefan Hofer, Timo Stuffler, Franz Hagl, Christian Hollerith

Proceedings Volume 5900, 59000N (2005) https://doi.org/10.1117/12.616948

KEYWORDS: Gold, Silicon, Contamination, X-rays, Particles, Scanning electron microscopy, Aluminum, Mirrors, Chemical analysis, Reflectivity

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Showing 5 of 11 publications

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