@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} } @article{StehlikovaProbstNentvichetal.2018, author = {Stehlikova, Veronika and Probst, Anne-Catherine and Nentvich, Ondrej and Urban, Martin and Sieger, Ladislav and D{\"o}hring, Thorsten and Hudec, Ren{\´e}}, title = {Study of multiple layers coatings for X-ray mirrors}, series = {Contributions of the Astronomical Observatory Skalnat{\´e} Pleso}, volume = {2018}, journal = {Contributions of the Astronomical Observatory Skalnat{\´e} Pleso}, number = {48}, editor = {Skopal, August{\´i}n}, pages = {488 -- 497}, year = {2018}, abstract = {This paper focuses on a theoretical background that motivated the experimental campaign of multiple layer coatings of X-ray mirrors, and the first results of the testing of the prepared samples. Simulations of the use of different overcoats were performed in order to improve the reflectivity of thin iridium coatings designed for X-ray optics effective in the energy up to 10 keV. Samples based on these simulations were prepared and are being tested for the properties that influence the X-ray optical performance, such as layer homogeneity, density and surface micro-roughness. Further the topic of the coating stress was addressed, as it is an issue in case of thin, lightweight X-ray mirrors and affects the time stability of layers. The discussion and preliminary results conclude our contribution.}, subject = {R{\"o}ntgenspiegel}, language = {en} } @inproceedings{DoehringProbstStehlikovaetal.2017, author = {D{\"o}hring, Thorsten and Probst, Anne-Catherine and Stehlikova, Veronika and Skala, Petr and Inneman, Adolf and Hudec, Rene}, title = {JEUMICO - Bayerisch-tschechische Kooperation zur Entwicklung von R{\"o}ntgenteleskopen}, series = {DGaO-Proceedings}, volume = {2017}, booktitle = {DGaO-Proceedings}, number = {2017}, publisher = {DGaO}, organization = {Hochschule Aschaffenburg}, issn = {1614-8436}, pages = {2}, year = {2017}, abstract = {Das Projekt JEUMICO wird vom Projekttr{\"a}ger BAYHOST im Rahmen eines Programms f{\"u}r bilaterale wissenschaftliche Projekte zwischen Tschechien und Bayern gef{\"o}rdert. Inhaltlich werden von der Hochschule Aschaffenburg und der Technischen Universit{\"a}t Prag hier gemeinsam R{\"o}ntgenoptiken f{\"u}r ein geplantes astronomisches Experiment an Bord einer NASA-H{\"o}henrakete entwickelt.}, subject = {R{\"o}ntgenstrahlung}, language = {de} } @inproceedings{HudecDoehringRemisova2017, author = {Hudec, Rene and D{\"o}hring, Thorsten and Remisova, Katerina}, title = {Lobster Eye Optics \& Biomimetics}, series = {DGaO-Proceedings}, volume = {2017}, booktitle = {DGaO-Proceedings}, number = {2017}, publisher = {DGaO}, organization = {Czech Academy of Sciences}, issn = {1614-8436}, pages = {2}, year = {2017}, abstract = {We present optic designs based on biomimetic, namely technical applications of animal eyes principles (here: Lobster Eyes) for the special application of wide field X-ray imaging. Thereby we show and discuss some experimental results and correlate them with simulations. Preliminary results of an ongoing study on other strange animal mirror eyes with potential scientific and technical applications are also discussed. Some of them are based on the principle of multilayer multi-mirror active optics arrangements. The Lobster Eye X-ray optics needs special reflective coatings for a better performance, which are currently developed within the Bavarian-Czech cooperation project JEUMICO.}, subject = {R{\"o}ntgenastronomie}, 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} } @article{HudecDoehring2017, author = {Hudec, Rene and D{\"o}hring, Thorsten}, title = {JEUMICO: Czech-Bavarian astronomical X-ray optics project}, series = {Contributions of the Astronomical Observatory Skalnat{\´e} Pleso}, volume = {2017}, journal = {Contributions of the Astronomical Observatory Skalnat{\´e} Pleso}, number = {47}, editor = {Slovak Academy of Sciences Astronomical Institute,}, pages = {170 -- 177}, year = {2017}, abstract = {Within the project JEUMICO, an acronym for Joint European Mirror Competence, the Aschaffenburg University of Applied Sciences and the Czech Technical University in Prague started a collaboration to develop mirrors for X-ray telescopes. Corresponding mirror segments use substrates of at silicon wafers which are coated with thin iridium � lms, as this material is promising high re ectivity in the X-ray range of interest. The sputtering parameters are optimized in the context of the expected re ectivity of the coated X-ray mirrors. In near future measurements of the assembled mirror modules optical performances are planned at an X-ray test facility.}, subject = {Iridium}, language = {en} } @misc{HudecPinaMarsikovaetal.2018, author = {Hudec, Rene and Pina, Ladislav and Marsikova, Veronika and Inneman, Adolf and D{\"o}hring, Thorsten}, title = {Kirkpatrick Baez X-ray Optics for Astrophysics: Recent Status}, editor = {Deutsche Gesellschaft f{\"u}r angewandte Optik,}, organization = {CVUT Prag}, pages = {1 -- 1}, year = {2018}, abstract = {X-ray optics in KB (Kirkpatrick Baez) arrangement represent promising alternative to Wolter optics in common use. We will present some new results including KB module developed and tested in X-rays within the EU AHEAD project.}, subject = {R{\"o}ntgenteleskop}, language = {en} } @misc{HudecPinaMarsikovaetal.2018, author = {Hudec, Rene and Pina, Ladislav and Marsikova, Veronika and Inneman, Adolf and D{\"o}hring, Thorsten}, title = {Lobster Eye X-ray Optics for Astrophysics: Recent Status}, editor = {Deutsche Gesellschaft f{\"u}r angewandte Optik,}, organization = {CVUT Prag}, pages = {1 -- 1}, year = {2018}, abstract = {X-ray optics in LE (Lobster Eye) arrangement represent important part of future X-ray wide field telescopes and monitors. We will present some new results in the design, development, tests and applications of LE X-ray optics with emphasis on astrophysics.}, subject = {R{\"o}ntgenteleskop}, language = {en} } @misc{DoehringHudec2018, author = {D{\"o}hring, Thorsten and Hudec, Rene}, title = {Optics development for X-ray astronomy - a review on four joint Bavarian-Czech projects}, organization = {Hochschule Aschaffenburg}, pages = {1 -- 1}, year = {2018}, abstract = {In the years 2016 to 2018 the Bavarian-Czech Academic Agency (BTHA) funded in summary four bilateral projects between Aschaffenburg University and CVUT Prague: JEUMICO, TRILAMICO, JODEXRA, and AXROCO. The effective combination of equipment, manpower, and know-how of both partners resulted in the development of stress-compensated iridium coatings for astronomical X-ray mirrors. The findings have been published at scientific conferences and in joint papers. This poster gives a review on the social , political and educational aspects of the collaborations in form of a photo documentation.}, subject = {R{\"o}ntgenspiegel}, language = {en} } @inproceedings{DoehringZeisingStieglitzetal.2022, author = {D{\"o}hring, Thorsten and Zeising, Sebastian and Stieglitz, Veronika and Burwitz, Vadim and Rukdee, Surangkhana and Friedrich, Peter and Jelinek, Martin and Hudec, Rene}, title = {R{\"o}ntgenteleskop-Funktionstests durch Beobachtung astronomischer Objekte am sichtbaren Nachthimmel}, series = {DGaO Proceedings}, volume = {2022}, booktitle = {DGaO Proceedings}, publisher = {DGaO}, organization = {TH Aschaffenburg}, issn = {1614-8436}, pages = {1 -- 2}, year = {2022}, abstract = {Lobster-Eye-R{\"o}ntgenteleskope nutzen reflektierende Planspiegel unter streifendem Einfall und zeichnen sich durch ein großes Beobachtungsfeld aus. Die Spiegel reflektieren auch sichtbare Strahlung hervorragend. Nach R{\"o}ntgen-messungen im Labor wurden nun weitere Tests durchgef{\"u}hrt, um die Abbildungs-eigenschaften mit realen Objekten des sichtbaren Himmels zu untersuchen.}, subject = {R{\"o}ntgenteleskop}, language = {de} } @inproceedings{HudecGilleGuimbelotetal.2022, author = {Hudec, Rene and Gille, Florian and Guimbelot, Elzear and Tichy, Vladimir and D{\"o}hring, Thorsten}, title = {Effective areas of astronomical X-ray optics for cubesats and rocket experiments}, series = {DGaO Proceedings}, volume = {2022}, booktitle = {DGaO Proceedings}, number = {123}, publisher = {DGaO}, organization = {Technische Universit{\"a}t Prag}, issn = {1614-8436}, pages = {1 -- 2}, year = {2022}, abstract = {The effective area is one of the main telescope parameters when justifying real space application. We discuss the estimation of the effective collecting area of an X-ray telescope by two different methods, an analytical method and a simulation algorithm, and then compare the results. The Lobster Eye type telescopes considered here are designed for rocket experiments and CubeSat flights.}, subject = {R{\"o}ntgenteleskop}, language = {en} } @misc{HudecGilleGuimbelotetal.2022, author = {Hudec, Rene and Gille, Florian and Guimbelot, Elzear and Tichy, Vladimir and D{\"o}hring, Thorsten}, title = {Effective areas of astronomical X-ray optics for cubesats and rocket experiments}, publisher = {DGaO}, organization = {TH Aschaffenburg}, pages = {1 -- 1}, year = {2022}, abstract = {We address the problem of estimation the sensitivity of astronomical X-ray telescopes of Lobster Eye type , with emphasis on calculation of effective areas for telescopes designed for rocket and CubeSat flights. This parameter is one of the principal parameters when justifying the real space application. Indeed, the larger the effective area is, the more efficient the optical system is, able to provide images of fainter and more distant celestial targets. We discuss the estimation of the effective collecting area of a X-ray telescope by two different methods and then compare the results: the analytical method and then the simulation algorithm.}, subject = {R{\"o}ntgenteleskop}, language = {en} } @inproceedings{DoehringStieglitzHudecetal.2022, author = {D{\"o}hring, Thorsten and Stieglitz, Veronika and Hudec, Rene and Sapsai, Iryna and Friedrich, Peter and Burwitz, Vadim}, title = {Characterization of a lobster-eye type X-ray telescope}, series = {EOSAM-Conference}, volume = {2022}, booktitle = {EOSAM-Conference}, organization = {TH Aschaffenburg}, pages = {1 -- 1}, year = {2022}, abstract = {Lobster-eye type X-ray telescopes use reflecting plano mirrors under grazing incidence and can observe a large field of view. As part of a Bavarian-Czech cooperation, two telescopes were build, equipped with mirrors coated with gold and iridium. Their X-ray characterization was carried out at the PANTER test facility, which simulates parallel starlight incident on the telescopes. The telescopes have an angular resolution of about 4 arc minutes in X-rays and a focal length of about 2 meters. The used X-ray mirrors reflect and focus visible light as well; their functionality in the optical regime was checked in laboratory tests. Now another test campaign will be carried out to examine the telescope resolution for real objects of the visible night sky and the imaging properties for star constellations.}, subject = {R{\"o}ntgenteleskop}, language = {en} } @inproceedings{DoehringStieglitzBurwitzetal.2021, author = {D{\"o}hring, Thorsten and Stieglitz, Veronika and Burwitz, Vadim and Hartner, Gisela and M{\"u}ller, Thomas and Schmidt, Thomas and Rukdee, Surangkhana and Friedrich, Peter and Sahin, Fatih and Hudec, Rene}, title = {Charakterisierung von Weitwinkel-R{\"o}ntgenteleskopen in der Testanlage PANTER}, series = {DGaO Proceedings}, volume = {2021}, booktitle = {DGaO Proceedings}, number = {122}, publisher = {DGaO}, organization = {TH Aschaffenburg}, issn = {1614-8436}, pages = {1 -- 2}, year = {2021}, abstract = {Im Rahmen einer bayerisch-tschechischen Kooperation entstanden zwei R{\"o}ntgenteleskope, best{\"u}ckt mit Gold- und Iridium-beschichteten Planspiegeln. Deren Charakterisierung erfolgte an der R{\"o}ntgentestanlage PANTER, welche parallel auf die Teleskope einfallendes Sternenlicht simuliert. Die Teleskope haben eine Winkelaufl{\"o}sung von ca. 4 Bogenminuten und eine Brennweite von rund 2 Metern.}, subject = {R{\"o}ntgenteleskop}, language = {de} } @inproceedings{HudecPinaInnemanetal.2019, author = {Hudec, Rene and Pina, Ladislav and Inneman, Adolf and Semencova, Veronika and D{\"o}hring, Thorsten}, title = {X/EUV and UV optics for miniature cubesats payloads}, series = {DGaO-Proceedings}, volume = {2019}, booktitle = {DGaO-Proceedings}, publisher = {DGaO}, organization = {CVUT Prag}, issn = {1614-8436}, pages = {1 -- 1}, year = {2019}, abstract = {The recent progress in cubesat technologies allows scientific payloads for these minisatellites to be considered. We will discuss the possible miniature X/EUV and UV telescopes and monitors as potential minisats payloads. The advanced electronics image detectors allows the size of the optics to be miniaturized, still providing valuable scientific results.}, subject = {Kleinsatellit}, language = {en} } @inproceedings{NiekampDoehringReesetal.2020, author = {Niekamp, Linus and D{\"o}hring, Thorsten and Rees, Paul and Hudec, Rene}, title = {Technologies, challenges and opportunities for optical CubeSat payloads}, series = {DGaO Proceedings}, volume = {2020}, booktitle = {DGaO Proceedings}, number = {2020}, publisher = {Deutsche Gesellschaft f{\"u}r angewandte Optik}, organization = {TH Aschaffenburg}, issn = {1614-8436}, pages = {1 -- 2}, year = {2020}, abstract = {This contribution describes optical payloads of CubeSat nanosatellites and their limiting factors. Some prominent examples are presented, and performance characteristics are discussed in the context of different commercial and scientific applications. Furthermore, the optical payload market has been evaluated and identified suppliers of commercial-of-the-shelf products are listed.}, subject = {Kleinsatellit}, language = {en} } @inproceedings{HudecPomahačStaniketal.2023, author = {Hudec, Rene and Pomahač, Vit and Stanik, Eva and D{\"o}hring, Thorsten and Schilling, Klaus}, title = {Space Telescopes based on Satellite Tandem Flights}, series = {DGaO Proceedings}, volume = {2023}, booktitle = {DGaO Proceedings}, issn = {1614-8436}, pages = {2}, year = {2023}, abstract = {Progress in satellite control engineering enables tandem flight arrangements of mini-satellites in future space missions. Cost effective CubeSat technologies offer an interesting possibility for space-born telescope payloads. Two small satellites will carry the telescope optics and the detector system, respectively. Related formation flight requirements could be transferred from the NetSat-Mission.}, subject = {R{\"o}ntgenteleskop}, language = {en} } @misc{HudecPomahacDoehringetal.2023, author = {Hudec, Ren{\´e} and Pomahac, Vit and D{\"o}hring, Thorsten and Stanik, Eva and Klaus, Schilling}, title = {Space Telescopes based on Satellite Tandem Flights}, series = {DGaO Jahrstagung}, volume = {2023}, journal = {DGaO Jahrstagung}, publisher = {DGaO}, organization = {Technische Hochschule Aschaffenburg}, pages = {1 -- 1}, year = {2023}, abstract = {Due to the recent progress in satellite control engineering, tandem flight arrangements of mini-satellites are currently in discussion and under consideration for future space missions. CubeSat technologies offer an interesting possibility for space-born telescope payloads based on this approach. In such a scenario, two small satellites will fly at a constant distance of a few meters up to 100 meters. Thereby, the front satellite will carry the telescope optics and the second satellite the detector system. Related formation flight requirements were addressed in the NetSat-Mission, composed of four 3U-CubeSats, launched 2020. Space technology challenges concern in particular orbit control by an appropriate propulsion system as well as precision attitude pointing towards the joint target, and could be transferred from the NetSat-mission to the proposed Tandem Mission. This will allow space-based telescopes with a long focal length even placed on board of small or miniature CubeSat-type satellites. Cost effective Kirkpatrick-Baez type X-ray telescopes represent an important application here as they have longer focal lengths compared to previous astronomical observatories using Wolter I type X-ray mirrors.}, subject = {R{\"o}ntgenteleskop}, language = {en} } @inproceedings{PomahacHudecDoehring2023, author = {Pomahac, Vit and Hudec, Rene and D{\"o}hring, Thorsten}, title = {CubeSat tandem flight for asteroid surveillance}, series = {SPIE Proceedings}, volume = {2023}, booktitle = {SPIE Proceedings}, number = {12576}, publisher = {SPIE}, organization = {CVUT Prague}, doi = {doi: 10.1117/12.2672396}, pages = {125760H-1 -- 125760H-5}, year = {2023}, abstract = {Conventional mining might not be sufficient to support the growth of humankind which is heavily dependent upon rare materials in technical applications. Asteroid mining might be an answer, with Near-Earth objects (NEOs) being the first targets. However, the first step in the asteroid mining cascade is to probe reachable asteroids. Moreover, to identify the best candidates for further activities hundreds to thousands of asteroids must be screened. The fast progressing development of CubeSats might allow the space community to do the initial in-situ screening in a minimalistical and economical manner. Additionally, formation flying might enable the miniaturization of optical payloads for asteroid composition analysis in CubeSats. The recent developments in formation flying are summarised in this study and the possibility of utilizing formation flying CubeSats for asteroid surveillance explored.}, subject = {Planetoid}, language = {en} } @inproceedings{DoehringStieglitzFriedrichetal.2023, author = {D{\"o}hring, Thorsten and Stieglitz, Veronika and Friedrich, Peter and Burwitz, Vadim and Jelinek, Martin and Hudec, Rene}, title = {Testing of lobster-eye type telescopes with X-rays and visible light}, series = {SPIE Proceedings}, volume = {2023}, booktitle = {SPIE Proceedings}, number = {12576}, publisher = {SPIE}, organization = {TH Aschaffenburg}, doi = {https://doi.org/10.1117/12.2665429}, pages = {1257606-1 -- 1257606-5}, year = {2023}, abstract = {Reflective coatings for astronomical X-ray optics were developed at the "Aschaffenburg Competence Center for Astronomical and Space Instrumentation" (ACCASI) since several years. As part of a Bavarian-Czech cooperation between the Technical University of Aschaffenburg and the Czech Technical University of Prague, now two mechanically identical telescopes were built. One telescope optic was equipped with conventional gold-coated mirrors, manufactured by the Czech project partners. The 34 X-ray mirrors of the second telescope use an innovative coating system made of chromium and iridium, which was applied at the Aschaffenburg coating laboratory. Both telescopes are designed according to the bionic principle of a reflecting lobster eye. The optics works with two consecutive reflections on mutually perpendicular mirror surfaces. This enables a large field of view with many square degrees in diameter, which, however, comes at the price of a reduced angular resolution. An extensive X-ray characterization of these telescopes was carried out at the PANTER test facility of MPE, which simulates parallel starlight incident on the telescopes. The telescopes have an angular resolution of about 4 arc minutes in X-rays and a focal length of about 2 meters. Furthermore, the used X-ray mirrors reflect and focus visible light as well and this functionality in the optical regime was checked in laboratory tests. Now another test campaign was done to examine the telescope resolution for real objects of the visible sky and the imaging properties for star constellations. Such functional tests by observing astronomical objects of the visible sky may simplify and accelerate the development of X-ray telescopes for satellite applications.}, subject = {R{\"o}ntgenteleskop}, language = {en} } @inproceedings{DoehringStieglitzHudecetal.2022, author = {D{\"o}hring, Thorsten and Stieglitz, Veronika and Hudec, Rene and Sapsai, Iryna and Friedrich, Peter and Burwitz, Vadim}, title = {Characterization of a lobster-eye type X-ray telescope}, series = {EPJ Web of Conferences}, volume = {266 (2022)}, booktitle = {EPJ Web of Conferences}, doi = {10.1051/epjconf/202226613010}, pages = {1 -- 2}, year = {2022}, abstract = {Lobster-eye type X-ray telescopes use reflecting plano mirrors under grazing incidence and can observe a large field of view. As part of a Bavarian-Czech cooperation, two telescopes were build, equipped with mirrors coated with gold and iridium. Their X-ray characterization was carried out at the PANTER test facility, which simulates parallel starlight incident on the telescopes. The telescopes have an angular resolution of about 4 arc minutes in X-rays and a focal length of about 2 meters. The used X-ray mirrors reflect and focus visible light as well; their functionality in the optical regime was checked in laboratory tests. Now another test campaign will be carried out to examine the telescope resolution for real objects of the visible night sky and the imaging properties for star constellations.}, subject = {R{\"o}ntgenteleskop}, language = {de} } @article{StieglitzBurwitzDoehringetal.2022, author = {Stieglitz, Veronika and Burwitz, Vadim and D{\"o}hring, Thorsten and Hudec, Rene and Vitek, Stanislav}, title = {Design and testing of a Kirkpatrick-Baez optics variation}, series = {EPJ Web of Conferences}, volume = {266 (2022)}, journal = {EPJ Web of Conferences}, doi = {10.1051/epjconf/202226603021}, pages = {1 -- 2}, year = {2022}, abstract = {Beside Wolter I X-ray optics, which are used at most in currently operating X-ray space telescopes, there exist also other optical designs and their usability for space observations is still the matter of studies. This article covers preliminary testing results of an optical module which is based on a modified Kirkpatrick-Baez optics. This X-ray optics, consisting of four sub-modules, was assembled in Prague and tested at the PANTER test facility of MPE afterward. The sub-modules use different reflective coatings, in part developed by our research group, on complementary flat mirrors, which approximate the shape of a Kirkpatrick-Baez optical design. In this contribution we summarise the design of the optical modules, the details of applied coating layers, and the X-ray characterisation results at the PANTER test facility}, subject = {R{\"o}ntgenoptik}, language = {en} } @inproceedings{HudecStieglitzDoehringetal.2025, author = {Hudec, Rene and Stieglitz, Veronika and D{\"o}hring, Thorsten and Friedrich, Peter and Burwitz, Vadim}, title = {Novel X-ray optics developed within the AHEAD2020 project}, publisher = {DGaO}, organization = {TH Aschaffenburg}, pages = {1 -- 1}, year = {2025}, abstract = {We present a summary of our contribution to the EU Horizon 2020 project AHEAD2020, with emphasis on the X-ray optics work package. The Czech Technical University - together with other collaborating institutes - studied innovative Lobster Eye (LE) and Kirkpatrick-Baez (KB) X-ray modules, based on the Multi Foil Optics technology (MFO). In addition, two major events were organized, namely a students workshop in December 2023 and a summer school in May 2024. The KB optics represents a promising and cost effective alternative to the currently used Wolter I telescopes. The LE X-ray optics, based on the Schmidt design, has a wide field of view (FOV) with a short focal length, making it suitable for CubeSat application. Thereby the 2D LE optics consist of two orthogonal sub-modules of flat smooth reflecting foils, each sub-modules focuses in one direction. The advantage of such optics is that it preserves the angular resolution throughout the FOV even for off-axis points, as demonstrated by simulations and measurements. There was a collaboration with Aschaffenburg University in design, development, and testing of the double LE module HORUS, comparing different reflecting coatings.}, subject = {R{\"o}ntgenoptik}, language = {en} } @inproceedings{HudecStieglitzDoehringetal.2025, author = {Hudec, Rene and Stieglitz, Veronika and D{\"o}hring, Thorsten and Friedrich, Peter and Burwitz, Vadim}, title = {Novel X-ray optics developed within the AHEAD2020 project}, series = {DGaO-Proceedings}, volume = {2025}, booktitle = {DGaO-Proceedings}, number = {126}, publisher = {DGaO}, organization = {Czech Technical University in Prague}, issn = {1614-8436}, pages = {1 -- 2}, year = {2025}, abstract = {We present a summary of our contribution to the EU Horizon 2020 project AHEAD2020, with emphasis on the X-ray optics work package. The Czech Technical University - together with other collaborating institutes - studied innovative Lobster Eye and Kirkpatrick-Baez X-ray modules, based on the Multi Foil Optics technology. In addition, a student's workshop in December 2023 and a summer school in May 2024 were organized within the project.}, subject = {R{\"o}ntgenoptik}, language = {en} } @misc{DoehringStieglitzBurwitzetal.2021, author = {D{\"o}hring, Thorsten and Stieglitz, Veronika and Burwitz, Vadim and Hartner, Gisela and M{\"u}ller, Thomas and Schmidt, Thomas and Rukdee, Surangkhana and Friedrich, Peter and Sahin, Fatih and HUdec, Rene}, title = {Charakterisierung von Weitwinkel-R{\"o}ntgenteleskopen in der Testanlage PANTER}, series = {DGaO Jahrestagung}, volume = {2021}, journal = {DGaO Jahrestagung}, organization = {TH Aschaffenburg}, pages = {1 -- 1}, year = {2021}, abstract = {Im Rahmen einer bayerisch-tschechischen Kooperation entstanden zwei mechanisch baugleiche R{\"o}ntgenteleskope, best{\"u}ckt mit Gold- und Iridium-beschichteten Planspiegeln. Die Charakterisierung der nach dem {\"a}gyptischen Gott HORUS benannten Teleskope erfolgte an der R{\"o}ntgentestanlage PANTER des Max-Plack-Instituts f{\"u}r extraterrestrische Physik. Diese Vakuum-Testanlage simuliert parallel auf die Teleskope einfallendes Sternenlicht, wobei hier die Strahlung aus einer R{\"o}ntgenquelle in 120 Metern Abstand stammt. Die Messungen selbst fanden in einer daran angebauten 12 Meter langen Testkammer von 3,5 Metern Durchmesser statt. Im M{\"a}rz 2021 sahen die HORUS-Teleskope zum erstem Mal R{\"o}ntgenlicht. W{\"a}hrend der Testkampagne von ca. 54 Stunden Dauer wurden 536 Einzelmessungen an den beiden Teleskopen durchgef{\"u}hrt, bei denen Photonenenergien und Einfallswinkel variiert wurden. Von einer empfindlichen CCD-Kamera, einem Prototyp der eROSITA-Satellitenkamera, wurden hierbei insgesamt 11.153.574 R{\"o}ntgenphotonen individuell detektiert, analysiert und digital verarbeitet. Die beiden Weitwinkel-R{\"o}ntgenteleskope haben eine Winkelaufl{\"o}sung von circa 4 Bogenminuten und eine Brennweite von rund zwei Metern.}, subject = {R{\"o}ntgenstrahlung}, language = {de} } @misc{HudecNovakovaPritzletal.2021, author = {Hudec, Rene and Novakova, Hana and Pritzl, Vaclav and Vojnar, Jan and D{\"o}hring, Thorsten}, title = {CubeSat mission for the observation of meteoroid impacts on Moon}, series = {DGaO Jahrestagung}, volume = {2021}, journal = {DGaO Jahrestagung}, organization = {CVUT Prague}, pages = {1 -- 1}, year = {2021}, abstract = {Recent progress in nanosatellite technologies allows to consider innovative new CubeSat missions for scientific purposes. We present and evaluate the design of a small and cost effective CubeSat mission to monitor lunar meteoroid impacts by detecting their optical flashes. The poster summarizes the results of a comprehensive survey of past and recent ground based and satellite based projects focussing on lunar impact monitoring and discusses important aspects of the proposed mission and various alternatives for their solutions. Several spacecraft orbits around Moon and their usefulness for lunar impact observation are studied. In addition, we discuss the environmental risks and challenges, which such spacecraft needs to face, mainly thermal management and radiation tolerance. Finally, we present and discuss the design an optical camera suitable to detect meteoroid impacts on the lunar surface.}, subject = {Impakt}, language = {en} } @inproceedings{HudecDoehring2025, author = {Hudec, Rene and D{\"o}hring, Thorsten}, title = {Astrophysical and scientific payloads for CubeSats}, series = {18th Pico- and Nanosatellite Workshop 2025, Abstracts Book}, volume = {2025}, booktitle = {18th Pico- and Nanosatellite Workshop 2025, Abstracts Book}, publisher = {Julius-Maximilians-Universit{\"a}t W{\"u}rzburg}, address = {W{\"u}rzburg}, organization = {Czech Technical University in Prague}, pages = {12 -- 12}, year = {2025}, abstract = {For scientific and commercial applications, CubeSats enable cost-effective missions and significantly reduce the time between mission concept and launch compared to classical large satellites. Since 2000, there has been an accelerating increase in CubeSat launches, which in turn is expected to drive up the demand for dedicated optical instruments, especially in commercially relevant areas like high-resolution optics for earth observation. We present some studies and ideas of application of CubeSats mainly in the field of astronomy and astrophysics elaborated and studied at the Czech Technical University in Prague in collaboration with Aschaffenburg University of Applied Sciences. These includes single CubeSats as well as tandem CubeSat constellations. These miniature satellites can carry miniature scientific payloads for high-energy observations of both astrophysical objects as well as targets in high earth atmosphere. The examples include miniature X-ray and UV telescopes monitors and cameras, but also optical and NIR payloads. Due to the recent progress in satellite control engineering, tandem flight arrangements of mini-satellites are currently in discussion and under consideration for future space missions. CubeSat technologies offer an interesting possibility for space-born telescope payloads based on this approach. In such scenario, two small satellites will fly at a constant distance of a few meters up to 100 meters. Thereby, the front satellite will carry the telescope optics and the second satellite the detector system. The tandem flight arrangements are crucial for design of space telescopes with larger focal distances exceeding the typical sizes of small satellites.}, subject = {Kleinsatellit}, language = {en} } @inproceedings{DoehringHudec2025, author = {D{\"o}hring, Thorsten and Hudec, Rene}, title = {One decade of joint Bavarian-Czech projects on astronomical X-ray optics}, volume = {2025}, number = {16}, publisher = {16th International Conference on Astronomical X-ray Optics}, address = {Prag}, organization = {TH Aschaffenburg}, pages = {1 -- 1}, year = {2025}, abstract = {Since ten years, Aschaffenburg University of Applied Sciences and the Czech technical university in Prague are now cooperating. During the recent decade, eleven joint projects have been executed, mainly targeting the development of astronomical X-ray optics. The bilateral cooperation also included the exchange of PhD students and scientists, cost compensation for conference participations, and the sponsoring of scientific conferences (AXRO and IBWS). The scientific output up to date are more than twenty joint publications and many individual conference contributions of the project partners in addition. The Bavarian-Czech Academic Agency (BTHA) has funded all of these projects. It is the goal of the Bavarian-Czech Academic Agency to support the academic collaboration in research and education and to contribute to an increased cooperation of the two neighbored countries Bavaria and Czech Republic in general. We will give a review on one decade of our Bavarian-Czech cooperation and on the scientific results of our joint projects on astronomical X-ray optics.}, subject = {R{\"o}ntgenoptik}, language = {en} } @inproceedings{StehlikovaDoehringStollenwerketal.2021, author = {Stehlikova, Veronika and D{\"o}hring, Thorsten and Stollenwerk, Manfred and Stadtm{\"u}ller, Johannes and Marsikova, Veronika and Hudec, Rene and Flachs, Dennis and Burwitz, Vadim and Hartner, Gisela and Rukdee, Surangkhana and M{\"u}ller, Thomas and Schmidt, Thomas and Inneman, Adolf and Klementova, Mariana and Zeising, Sebastian and Langmeier, Andreas}, title = {Lobster eye type X-ray telescope with chromium-iridium coated tri-layer mirrors}, series = {Proceedings of SPIE}, volume = {2021}, booktitle = {Proceedings of SPIE}, number = {11776}, publisher = {SPIE}, organization = {Czech Technical University in Prague}, doi = {https://doi.org/10.1117/12.2589266}, pages = {1177605-1 -- 1177605-8}, year = {2021}, abstract = {For space-born astronomical X-ray telescopes, iridium-based reflective layer systems are known as highly effective mirrors coatings. During the recent years, Aschaffenburg University of Applied Sciences and the Czech Technical University in Prague jointly developed stress compensated chromium-iridium coatings for this application. To overcome the disturbing reflectivity reduction of the iridium absorption edge around 2 keV photon energy, thin overcoat layers of chromium were applied in addition. Now a prototype of a wide-field, imaging X-ray telescope of Lobster Eye type is assembled at the company RIGAKU. For this purpose a small series of 34 mirrors based on 100 x 50 mm semiconductor grade silicon substrates has been coated at Aschaffenburg University. The applied tri-layer system consists of a stack of 40 nm chromium, which act as adhesive layer and compensates layer stress, a 30 nm iridium thick reflective layer, and an additional overcoat layer of 6 nm chromium. This layer system have been analysed by AFM and TEM images. The mirrors are assembled into an aluminium frame to build a 2D Lobster Eye type telescope. The designed focal length of this wide field X-ray telescope is two meter. To study the performance of the tri-layer coating system, a twin LE telescope with convenient gold coatings was manufactured also. Performance measurements of both telescopes and under same conditions are planned at the PANTER test facility at the Max-Planck Institute for Extraterrestrial Physics. First experimental results, their comparison with theoretical simulations and the comparison between both models will be presented in this contribution.}, subject = {R{\"o}ntgenteleskop}, language = {en} }