arXiv subjects

H. Wolf

Publications and source records attributed to H. Wolf.

2 recordsLinked to original sources

arXiv2026

Characterization of Next Generation Power Over Fiber Systems under Cryogenic Conditions for Advanced Physics Instrumentation

The successful application of Power-over-Fiber (PoF) technology to power photon detection systems in DUNE prototypes operating under high-voltage and cryogenic conditions has laid the groundwork for the next generation of PoF systems operating in harsh environments. This paper presents the characterization of the main components of a new PoF system operating at 1470 and 1550 nm, including the measurement of the electrical-to-optical conversion efficiency of laser transmitters, the optical-to-electrical conversion efficiency of commercial optical power converters (OPCs), and the estimation of optical fiber attenuation under cryogenic conditions. In addition, a detailed characterization of the response of silicon photomultipliers (SiPMs) to light leakage from optical fibers and OPCs is presented, using 808 nm as a reference to evaluate the reduction in the SiPM response at longer wavelengths. The results of this work provide a foundation for the development of next-generation PoF systems capable of powering electronics and electrical systems for future high-energy physics experiments. In addition, the electrical isolation, low-noise operation, and long-term reliability of PoF technology could motivate its application in other research fields requiring remote power delivery under cryogenic conditions, as well as in systems where infrared photons could affect their performance.

physics.ins-det↗

arXiv2022

VLBI Celestial and Terrestrial Reference Frames VIE2022b

Context: We introduce the computation of global reference frames from Very Long Baseline Interferometry (VLBI) observations at the Vienna International VLBI Service for Geodesy and Astrometry (IVS) Analysis Center (VIE) in detail. We focus on the celestial and terrestrial frames from our two latest solutions VIE2020 and VIE2022b. Aims: The current International Celestial and Terrestrial Reference Frames, ICRF3 and ITRF2020, include VLBI observations until spring 2018 and December 2020, respectively. We provide terrestrial and celestial reference frames including VLBI sessions until June 2022 organized by the IVS. Methods: Vienna terrestrial and celestial reference frames are computed in a common least squares adjustment of geodetic and astrometric VLBI observations with the Vienna VLBI and Satellite Software (VieVS). Results: We provide high-quality celestial and terrestrial reference frames computed from 24-hour IVS observing sessions. The CRF provides positions of 5407 radio sources. In particular, positions of sources with few observations at the time of the ICRF3 calculation could be improved. The frame also includes positions of 870 new radio sources, which are not included in ICRF3. The additional observations beyond the data used for ITRF2020 provide a more reliable estimation of positions and linear velocities of newly established VLBI Global Observing System (VGOS) telescopes.

astro-ph.IM↗