@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} } @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} } @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{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} } @inproceedings{StehlikovaProbstNentvichetal.2017, author = {Stehlikova, Veronika and Probst, Anne-Catherine and Nentvich, Ondrej and Urban, Martin and Inneman, Adolf and Sieger, Ladislav and Marsikova, Veronika and D{\"o}hring, Thorsten}, title = {Development of iridium coated silicon X-ray mirrors for Lobster Eye astronomical telescopes}, series = {Proceedings of EOSMOS 2017}, volume = {2017}, booktitle = {Proceedings of EOSMOS 2017}, number = {EOSMOS 2017}, publisher = {European Optical Society}, organization = {CVUT Prag}, pages = {1 -- 2}, year = {2017}, abstract = {In the field of X-ray astronomy different types of telescope optics based on grazing incidence mirrors can be used. This contribution presents a special design of a Lobster Eye wide-field telescope with mirrors based on flat silicon wafers and the task of coating such mirror substrates with reflective iridium layers.}, subject = {Iridium}, language = {en} } @inproceedings{DoehringProbstStollenwerketal.2017, author = {D{\"o}hring, Thorsten and Probst, Anne-Catherine and Stollenwerk, Manfred and Emmerich, Florian and Stehl{\´i}kov{\´a}, Veronika and Inneman, Adolf}, title = {Prototyping iridium coated mirrors for X-ray astronomy}, series = {Proceedings of the International Society for Optics and Photonics}, volume = {2017}, booktitle = {Proceedings of the International Society for Optics and Photonics}, number = {10235}, editor = {Hudec, Ren{\´e} and Pina, Ladislav}, publisher = {SPIE International Society for Optics and Photonics}, address = {Bellingham WA}, organization = {Hochschule Aschaffenburg}, doi = {10.1117/12.2265931}, pages = {1023504-1 -- 1023504-8}, year = {2017}, abstract = {X-ray astronomy uses space-based telescopes to overcome the disturbing absorption of the Earth´s atmosphere. The telescope mirrors are operating at grazing incidence angles and are coated with thin metal films of high-Z materials to get sufficient reflectivity for the high-energy radiation to be observed. In addition the optical payload needs to be light-weighted for launcher mass constrains. 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. The X-ray telescopes currently developed within this Bavarian- Czech project are of Lobster eye type optical design. Corresponding mirror segments use substrates of flat silicon wafers which are coated with thin iridium films, as this material is promising high reflectivity in the X-ray range of interest. The deposition of the iridium films is based on a magnetron sputtering process. Sputtering with different parameters, especially by variation of the argon gas pressure, leads to iridium films with different properties. In addition to investigations of the uncoated mirror substrates the achieved surface roughness has been studied. Occasional delamination of the iridium films due to high stress levels is prevented by chromium sublayers. Thereby the sputtering parameters are optimized in the context of the expected reflectivity 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} }