An Ultra-Wideband Leaky Lens Antenna for Broadband Spectroscopic Imaging Applications

We present the design, fabrication and characterisation of a broadband leaky lens antenna for broadband, spectroscopic imaging applications. The antenna is designed for operation in the 300-900 GHz band. We integrate the antenna directly into an Al-NbTiN hybrid MKID to measure the beam pattern and absolute coupling efficiency at three frequency bands centred around 350, 650 and 850 GHz, covering the full antenna band. We find an aperture efficiency $\eta_{ap} \approx 0.4$ over the whole frequency band, limited by lens reflections. We find a good match with simulations for both the patterns and efficiency, demonstrating a 1:3 bandwidth in the sub-mm wavelength range for future on-chip spectrometers.Comment: Accepted for Publication at IEEE Transactions on Antennas and Propagatio

Scientific Railway Signalling Symposium 2018 - Digital neue Wege fahren

Die Leit- und Sicherungstechnik (LST) ist für die Durchführung von Zugfahrten von kritischer Bedeutung. Von ihr hängen nicht nur die Sicherheit von Fahrgästen, Fracht und Infrastruktureinrichtungen ab, sondern auch die Kapazität der Infrastruktur. Digitalisierung ist das Schlagwort der Stunde. Es ist die Klammer für zahllose innovative Ideen, die das System Eisenbahn revolutionieren sollen. Allen Akteuren ist klar, dass auch und gerade im Bereich der Leit- und Sicherungstechnik Veränderungen kommen werden und notwendig sind, um die Wettbewerbsfähigkeit des Verkehrsträgers Eisenbahn zu erhalten und dessen nachhaltigen Beitrag zum Erreichen der Klimaziele zu sichern. Doch noch ist unklar, welche Veränderungen sich wirklich in den kommenden Jahren durchsetzen werden und welche in absehbarer Zeit nur Luftschlösser bleiben. Um diese Herausforderungen zu meistern ist ein intensiver Austausch aller Beteiligten notwendig, insbesondere auch zwischen Wissenschaft und Praxis. Diesem Ziel widmete sich das 2. Scientific Railway Signalling Symposium am 13. Juni 2018 in Darmstadt. Der Tagungsband enthält vier wissenschaftliche Beiträge des Symposiums

Towards a Circular Economy of Industrial Software

Software has become an indispensable part of industrial production and thus influences the life cycle of manufacturing systems, as many of these systems have to be replaced or evolved due to changing requirements. Software adaptation through continuous evolution extends the service time of these systems and thus saves valuable resources. In this paper we present an interdisciplinary methodology for reengineering legacy software to increase the productive lifetime. Our proposed approach systematically reuses implicit domain knowledge to evolve, validate and commission new software from legacy code. The approach is evaluated on a CNC machine as a special type of industrial system

Towards a Circular Economy of Industrial Software

Software has become an indispensable part of industrial production and thus influences the life cycle of manufacturing systems, as many of these systems have to be replaced or evolved due to changing requirements. Software adaptation through continuous evolution extends the service time of these systems and thus saves valuable resources. In this paper we present an interdisciplinary methodology for reengineering legacy software to increase the productive lifetime. Our proposed approach systematically reuses implicit domain knowledge to evolve, validate and commission new software from legacy code. The approach is evaluated on a CNC machine as a special type of industrial system

DESHIMA 2.0: Development of an Integrated Superconducting Spectrometer for Science-Grade Astronomical Observations

Integrated superconducting spectrometer (ISS) technology will enable ultra-wideband, integral-field spectroscopy for (sub)millimeter-wave astronomy, in particular, for uncovering the dust-obscured cosmic star formation and galaxy evolution over cosmic time. Here, we present the development of DESHIMA 2.0, an ISS for ultra-wideband spectroscopy toward high-redshift galaxies. DESHIMA 2.0 is designed to observe the 220-440 GHz band in a single shot, corresponding to a redshift range of z = 3.3-7.6 for the ionized carbon emission ([C II] 158 μ m). The first-light experiment of DESHIMA 1.0, using the 332-377 GHz band, has shown an excellent agreement among the on-sky measurements, the laboratory measurements, and the design. As a successor to DESHIMA 1.0, we plan the commissioning and the scientific observation campaign of DESHIMA 2.0 on the ASTE 10-m telescope in 2023. Ongoing upgrades for the full octave-bandwidth system include the wideband 347-channel chip design and the wideband quasi-optical system. For efficient measurements, we also develop the observation strategy using the mechanical fast sky-position chopper and the sky-noise removal technique based on a novel data-scientific approach. In the paper, we show the recent status of the upgrades and the plans for the scientific observation campaign