Preface

Julian Gröbner, Guest editor and chairman of the NEWRAD scientific committee Physikalisch-Meteorologisches Observatorium Davos, World Radiation Center (PMOD/WRC) Dorfstrasse 33 7260 Davos Dorf, Switzerland The 14th International Conference on New Developments and Applications in Optical Radiometry (NEWRAD 2021) was organised by the National Institute for Standards and Technology (NIST), Boulder, United States and held online from 21 to 24 June 2021. Due to the COVID pandemic the original venue at Boulder in June 2020 had to be postponed and changed to a virtual event with a novel schedule consisting of pre-recorded talks and live sessions with the presenters to interact with conference attendees. The event was very well attended, notwithstanding the global participation with corresponding challenging time zones of the participants. A total of 274 registrations were received, with typically more than 100 attendees joining the online sessions. The NEWRAD scientific Committee would like to thank John Lehman and the whole local organising team for organising and holding this excellent event in the frame of these challenging conditions. 142 presentations were submitted, of which 48 were selected for oral talks, while the remaining submissions were presented as posters. Julian Gröbner, Guest editor and chairman of the NEWRAD scientific committee this title available in this pdf.

JuSPARC - The Jülich Short-Pulsed Particle and Radiation Center

JuSPARC, the Jülich Short-Pulsed Particle and Radiation Center, is a laser-driven facility to enable research with short-pulsed photon and particle beams to be performed at the Forschungszentrum Jülich. The conceptual design of JuSPARC is determined by a set of state-of-the-art time-resolved instruments, which are designed to address the electronic, spin, and structural states of matter and their dynamic behaviour. From these instruments and experiments JuSPARC derives the need of operating several dedicated high pulse-power laser systems at highest possible repetition rates. They serve as core units for optimized photon up-conversion techniques generating the light pulses for the respective experiments. The applications also include experiments with spin polarized particle beams, which require the use of laser-based polarized gas targets. Thus, in its rst stage JuSPARC comprises four driving laser systems, called JuSPARC_VEGA, JuSPARC_DENEB, JuSPARC_SIRIUS and JuSPARC_MIRA, which are outlined in this article.

MATRIX SIMULATOR OF ECHO SIGNALS OF TWO-POSITION RADAR STATION

In this paper echo signals simulation task of two-position systems was considered. A matrix simulator composed of coherent transmitters is offered as a solution. Herewith in order to provide independent imitation for each antenna of the Radar station it’s suggested to use the additional transmitters correcting simulated echo signals at the receiving points. Correction is based on the principle of phase compensation of the signals from emitters that are equidistant from a specific receiver point. The configuration of the minimum possible number of emitting points was obtained, which has the potential for independent control of the apparent radiation center. Shown that the compensation condition of the signals of the transmitter group is not enough for independent control of the apparent radiation center. The sufficient independence conditions were formulated. The obtained theoretical results were confirmed by the data of numerical experiments.

The World Optical Depth Research and Calibration Center (WORCC) quality assurance and quality control of GAW-PFR AOD measurements

The World Optical Depth Research Calibration Center (WORCC) is a section within the World Radiation Center at Physikalisches-Meteorologisches Observatorium (PMOD/WRC), Davos, Switzerland, established after the recommendations of the World Meteorological Organization for calibration of aerosol optical depth (AOD)-related Sun photometers. WORCC is mandated to develop new methods for instrument calibration, to initiate homogenization activities among different AOD networks and to run a network (GAW-PFR) of Sun photometers. In this work we describe the calibration hierarchy and methods used under WORCC and the basic procedures, tests and processing techniques in order to ensure the quality assurance and quality control of the AOD-retrieved data.