@inproceedings{DoehringStollenwerkGongetal.2015, author = {D{\"o}hring, Thorsten and Stollenwerk, Manfred and Gong, Qingqing and Proserpio, Laura and Winter, Anita and Friedrich, Peter}, title = {The challenge of developing thin mirror shells for future X-ray telescopes}, series = {Proceedings of SPIE}, volume = {2015}, booktitle = {Proceedings of SPIE}, number = {9628}, organization = {Hochschule Aschaffenburg}, pages = {962809-1 -- 962809-8}, year = {2015}, abstract = {Previously used mirror technologies are not able to fulfil the requirements of future X-ray telescopes due to challenging requests from the scientific community. Consequently new technical approaches for X-ray mirror production are under development. In Europe the technical baseline for the planned X-ray observatory ATHENA is the radical new approach of silicon pore optics. NASA´s recently launched NuSTAR mission uses segmented mirrors shells made from thin bended glasses, successfully demonstrating the feasibility of the glass forming technology for X-ray mirrors. For risk mitigation also in Europe the hot slumping of thin glasses is being developed as an alternative technology for lightweight X-ray telescopes. The high precision mirror manufacturing requires challenging technical developments; several design trades and trend-setting decisions need to be made and are discussed within this paper. Some new technical and economic aspects of the intended glass mirror serial production are also studied within the recently started interdisciplinary project INTRAAST, an acronym for "industry transfer of astronomical mirror technologies". The goal of the project, embedded in a cooperation of the Max-Planck-Institute for extraterrestrial Physics and the University of Applied Sciences Aschaffenburg, is to master the challenge of producing thin mirror shells for future X-ray telescopes. As a first project task the development of low stress coatings for thin glass mirror substrates have been started, the corresponding technical approach and first results are presented.}, subject = {Astronomie}, language = {en} } @inproceedings{WinterBreunigFriedrichetal.2015, author = {Winter, Anita and Breunig, Elias and Friedrich, Peter and Proserpio, Laura and D{\"o}hring, Thorsten}, title = {Indirect glass slumping for future X-ray missions: overview, status and progress}, series = {Proceedings of SPIE}, volume = {2015}, booktitle = {Proceedings of SPIE}, number = {9603}, organization = {Max-Planck-Institut f{\"u}r extraterrestrische Physik}, pages = {960308-1 -- 960308-8}, year = {2015}, abstract = {Future X-ray telescopes aim for large effective area within the given mass limits of the launcher. A promising method is the hot shaping of thin glass sheets via a thermal slumping process. This paper presents the status and progress of the indirect glass slumping technology developed at the Max-Planck-Institut for extraterrestrial Physics (MPE). Recent developments in our research include the use of the mould material Cesic under vacuum, as well as the fabrication of a high-precision slumping mould, which meets the requirements of large, high angular resolution missions like ATHENA. We describe the way forward to optimise the slumping process on these materials, the force-free integration concept and its progress, as well as the first test on reflective coating application.}, subject = {Astronomie}, language = {en} } @misc{SchaeferDoehringSeibertetal.2013, author = {Sch{\"a}fer, Martin and D{\"o}hring, Thorsten and Seibert, Volker and Westerhoff, Thomas and Nowak, Hans-Joachim}, title = {SUBSTRATE FOR MIRROR SUPPORT WITH REDUCED WEIGHT AND MIRROR PROVIDED WITH MIRROR SUPPORT WITH REDUCED WEIGHT}, year = {2013}, abstract = {To provide a substrate for a mirror support, in which there still remains a high rigidity, despite a reduced weight. ;SOLUTION: In a substrate, particularly in a substrate for a mirror support, in which recesses are introduced in one surface, preferably in the back side of the substrate, as a result of which, in particular, bridging pieces are defined between the recesses, in order to achieve the situation in which despite a reduced weight, a high rigidity still remains, which means only a slight sagging after the correct take-in of the substrate in a holding device provided for it, at least one first position of the bridging pieces includes a width that is different from a second portion of the bridging pieces.}, subject = {Spiegeloptik}, language = {en} } @misc{SchaeferDoehringSeibertetal.2014, author = {Sch{\"a}fer, Martin and D{\"o}hring, Thorsten and Seibert, Volker and Westerhoff, Thomas and Nowak, Hans-Joachim}, title = {Substrate for a mirror support with reduced weight as well as mirror with reduced-weight mirror support}, year = {2014}, abstract = {Diesen Text {\"u}bersetzen Erste Seite Clipping von US8911098 (B2) In a substrate, particularly in a substrate for a mirror support, in which recesses are introduced in one surface, preferably in the back side of the substrate, as a result of which, in particular, bridging pieces are defined between the recesses, in order to achieve the situation that despite a reduced weight, a high rigidity still remains, which means only a slight sagging after its correct uptake in a holding device provided for it, it is provided that at least one first portion of the bridging pieces has a width that is different than a second portion of the bridging pieces.}, subject = {Spiegeloptik}, language = {en} } @misc{SchaeferDoehringSeibertetal.2015, author = {Sch{\"a}fer, Martin and D{\"o}hring, Thorsten and Seibert, Volker and Westerhoff, Thomas and Nowak, Hans-Joachim}, title = {Mirror supporting substratum for e.g. terrestrial observation, has spacers defined between one set of recesses and/ or two set of recesses, where part of one set of spacers has width different from width of part of other set of spacers}, year = {2015}, abstract = {The substratum (1) has two set of recesses (2, 3, 4, 7, 8) formed in a rear face (16), where the substratum is produced from a monolithic block of material including a lithium- aluminum- silicon type glass ceramic material. Set of spacers (5, 6, 9, 10) are defined between one set of recesses (2, 3, 4) and/ or the two set of recesses. A part of one set of spacers (5, 6) defined by the former recesses has width different from width of a part of other set of spacers (9, 10) defined by the latter recesses.}, subject = {Spiegeloptik}, language = {en} } @inproceedings{DoehringProbstStollenwerketal.2016, author = {D{\"o}hring, Thorsten and Probst, Anne-Catherine and Stollenwerk, Manfred and Wen, Mingwu and Proserpio, Laura}, title = {Development of low-stress Iridium coatings for astronomical x-ray mirrors}, series = {Proceedings of SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray}, volume = {2016}, booktitle = {Proceedings of SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray}, number = {9905}, editor = {den Herder, Jan-Willem A. and Takahashi, Tadayuki and Bautz, Marshall}, doi = {10.1117/12.2232074}, pages = {99056S-1 -- 99056S-7}, year = {2016}, abstract = {Previously used mirror technologies are not suitable for the challenging needs of future X-ray telescopes. This is why the required high precision mirror manufacturing triggers new technical developments around the world. Some aspects of X-ray mirrors production are studied within the interdisciplinary project INTRAAST, a German acronym for "industry transfer of astronomical mirror technologies". The project is embedded in a cooperation of Aschaffenburg University of Applied Sciences and the Max-Planck-Institute for extraterrestrial Physics. One important task is the development of low-stress Iridium coatings for X-ray mirrors based on slumped thin glass substrates. The surface figure of the glass substrates is measured before and after the coating process by optical methods. Correlating the surface shape deformation to the parameters of coating deposition, here especially to the Argon sputtering pressure, allows for an optimization of the process. The sputtering parameters also have an influence on the coating layer density and on the micro-roughness of the coatings, influencing their X-ray reflection properties. Unfortunately the optimum coating process parameters seem to be contrarious: low Argon pressure resulted in better micro-roughness and higher density, whereas higher pressure leads to lower coating stress. Therefore additional measures like intermediate coating layers and temperature treatment will be considered for further optimization. The technical approach for the low-stress Iridium coating development, the experimental equipment, and the obtained first experimental results are presented within this paper.}, subject = {R{\"o}ntgenspiegel}, language = {en} } @inproceedings{DoehringStollenwerkProserpioetal.2016, author = {D{\"o}hring, Thorsten and Stollenwerk, Manfred and Proserpio, Laura and Breunig, Elias and Friedrich, Peter}, title = {The challenging development of lightweight glass mirrors for future X-ray telescopes}, series = {DGaO Proceedings}, volume = {2016}, booktitle = {DGaO Proceedings}, publisher = {Deutsche Gesellschaft f{\"u}r angewandte Optik}, address = {Erlangen}, organization = {Hochschule Aschaffenburg}, issn = {1614-8436}, url = {http://nbn-resolving.de/nbn:de:0287-2016-B018-0}, pages = {2}, year = {2016}, abstract = {Previously used mirror technologies are not able to fulfill the challenging requirements of future X-ray telescopes. A promising new technology under development is the hot slumping of thin glasses. Challenges, design trades and first results are presented, including the thermal shaping process, the development of low stress coatings and the mirror segments integration concept.}, subject = {R{\"o}ntgenteleskop}, language = {en} } @inproceedings{ProbstDoehringStollenwerketal.2017, author = {Probst, Anne-Catherine and D{\"o}hring, Thorsten and Stollenwerk, Manfred and Mingwu, Wen and Proserpio, Laura}, title = {Iridium coatings for space based x-ray optics}, series = {Proceedings of SPIE}, volume = {2017}, booktitle = {Proceedings of SPIE}, number = {10562}, editor = {Cugny, Bruno and Karafolas, Nikos and Sodnik, Zoran}, doi = {10.1117/12.2296167}, pages = {105621E-01 -- 105621E-09}, year = {2017}, abstract = {Future investigations of astronomical X-ray sources require light weight telescope systems with large collecting areas and good angular resolution. The Wolter I type telescope design offers a suitable possibility for obtaining performant X-ray mirrors with high collecting areas. The technology based on replicated slumped glass optics using thin glasses thereby provides the opportunity to fulfil the light weight and mass production requirements. In NASA's telescope NuSTAR this technology has been proven as advantageous compared to previous systems. Coating thin glasses with iridium, gold or platinum enhances the reflectivity of X-ray mirrors.}, subject = {Iridium}, language = {en} } @article{DoehringHudec2018, author = {D{\"o}hring, Thorsten and Hudec, Rene}, title = {JEUMICO and TRILAMICO: Dimensions of successful Bavarian-Czech cooperation}, series = {Contributions of the Astronomical Observatory Skalnat{\´e} Pleso}, volume = {2018}, journal = {Contributions of the Astronomical Observatory Skalnat{\´e} Pleso}, number = {Vol. 48 / 3}, editor = {Skopal, August{\´i}n}, pages = {430 -- 436}, year = {2018}, abstract = {In December 2017 the two projects JEUMICO (an acronym for Joint European Mirror Cooperation) and TRILAMICO (standing for Trilateral Mirror Collaboration) are ending. Different aspects of this Bavarian-Czech collaboration between Aschaffenburg University and the Czech Technical University in Prague are discussed. The multiple dimensions of this cooperation are scientific achievements, public relation measures, internationalization of education, financial aspects, inter-cultural communication, and also the actual political situation within Europe.}, subject = {R{\"o}ntgenspiegel}, language = {en} } @inproceedings{SkalaDoehringHudec2017, author = {Skala, Petr and D{\"o}hring, Thorsten and Hudec, Rene}, title = {Colors of the universe - market study on optical filters for professional astronomy}, series = {DGaO-Proceedings}, volume = {2017}, booktitle = {DGaO-Proceedings}, number = {2017}, publisher = {DGaO}, organization = {Czech Technical University in Prague}, issn = {1614-8436}, pages = {2}, year = {2017}, abstract = {For astronomers, filters are essential observational tools and in many cases, it is hard for them to find the best supplier. We present list of filters manufacturers and their capabilities sorted and discussed.}, subject = {Markt{\"u}bersicht}, language = {en} }