Tootfinder

Helical Electron Beam Micro-Bunching by High-Order Modes in a Micro-Plasma Waveguide
Xinju Guo, Longqing Yi
https://arxiv.org/abs/2506.15094 https://

Helical Electron Beam Micro-Bunching by High-Order Modes in a Micro-Plasma Waveguide
Electron acceleration by a high-power Laguerre-Gaussian pulse in a micro-plasma waveguide is investigated. When the incident laser travels in the waveguide, electrons on the wall are extracted into the vacuum core and accelerated by the longitudinal field of the waveguide mode. Using 3D particle-in-cell simulations, we demonstrate that high energy (~100 MeV) electron beams with extremely high charge (~10 nC), ultrashort duration (~30 fs) and small divergence (~1 deg) can be produced by a 100-TW…

Dynamically Tunable Helical Antenna
Ethan Chien, Jan Steckel
https://arxiv.org/abs/2506.14065 https://arxiv.org/pdf/2506.14065…

Dynamically Tunable Helical Antenna
Unmanned aerial FPV systems demand ultra-low latency, high-reliability communication links. At high speeds and in cluttered environments, Doppler shifts and rapid multipath changes can dramatically raise packet error rates. This paper investigates these phenomena in the context of ExpressLRS (ELRS) long-range FPV control links and demonstrates a novel solution: real-time geometry tuning of a circularly polarized helical antenna array. This study integrates Maxwell-equation-based full-wave simul…

from my link log —
Elementary functions NOT following the IEEE 754 floating-point standard.
http://www.hlsl.co.uk/blog/2020/1/29/ieee754-is-not-followed
saved 2025-02-11

Elementary Functions and NOT Following the IEEE 754 Floating-Point Standard — TRYING TO FIND THE OBVIOUS
The IEEE-754 Standard for floating-point numbers was introduced initially in 1985 to solve the problem of diverse floating point implementations prevent code being portable and increase stability across platforms. It has been widely adopted and revised over the last 30 years and if you have dealt

Resonant helical dichroism in twisted dielectric metastructures
Yiyuan Wang, Chi Li, Haoyi Yu, Stefan A. Maier, Jinhui Shi, Haoran Ren, Kirill Koshelev
https://arxiv.org/abs/2506.14173

Resonant helical dichroism in twisted dielectric metastructures
Circular dichroism, arising from interactions with light fields of opposite spin angular momentum, has become a fundamental tool for molecular characterization. Meanwhile, helical dichroism (HD) - the dichroic response to vortex beams carrying opposite orbital angular momentum (OAM) - offers an alternative approach for probing chiral molecules and photonic structures. Previous demonstrations of HD have been limited to non-resonant light-matter interactions with chiral micro- and nanostructures,…

Im Saale-Holzland-Kreis entsteht auf dem Gelände eines früheren Flugplatzes bei #Göritzberg ein neuer #Solarpark.
Drei Genossenschaften realisieren das Projekt mit 11.000 Modulen und 5 MWp Leistung. Künftig können rund 2.000 Haushalte versorgt werden.
Zusätzlich entsteht ein

Baustart für neuen Solarpark im Saale-Holzland-Kreis
Auf dem früheren Agrarflugplatz Göritzberg entsteht ein neuer Solarpark. Nun wurde der erste feierliche Spatenstich getätigt.

"Floating platform to produce synthetic fuels using wind, seawater, and air"
#Energy #Renewables
https://

Floating platform to produce synthetic fuels using wind, seawater, and air
Off-grid, modular, and seaworthy: KIT (Karlsruhe Institute of Technology) and partners intend to produce synthetic fuels on a floating platform using wind energy, seawater, and ambient air. For this purpose, the "PtX-Wind" project was launched under the H2Mare lead project. A corresponding modular plant was installed on a barge and lies operational at anchor in Bremerhaven. Later this year, it will start producing synthetic fuel directly on the sea just off Helgoland Island.

Magnetic field in the Lobes of the Seyfert Galaxy NGC3516: Suggestions of a Helical field
Salmoli Ghosh (NCRA-TIFR), P. Kharb (NCRA-TIFR), E. Sajjanhar (Ashoka University), A. Pasetto (IRyA-UNAM), B. Sebastian (STScI)
https://arxiv.org/abs/2506.11854

Magnetic field in the Lobes of the Seyfert Galaxy NGC3516: Suggestions of a Helical field
We present polarization images from the Karl G. Jansky Very Large Array (VLA) and the Giant {Metrewave} Radio Telescope (GMRT) at 5.5, 10 GHz and 663 MHz of the changing-look (CL) AGN, NGC3516. A transverse gradient in the rotation measure (RM) is detected in the northern and southern kpc-scale lobes. Such gradients have typically been suggested to be signatures of a helical magnetic (B-) field. We detect circular polarization in the core and inner jet-knot of this source which is known to host…

Ab sofort 1 Woche Urlaub im Nirgendwo.
Nettofahrtzeit auf den Punkt 3:30, besser geht's nicht.
Jetzt kleine Brotzeit und regionales Bierchen.
#Dachsberg #BlackForest #Entschleunigung

Brief an Ministerin - Mikl-Leitner will keine deutschen „Flüchtlinge“ #News #Nachrichten

In #Göritzberg entsteht Thüringen​s größtes #Bürgerenergie-Projekt.
Auf einem früheren #Agrarflugplatz bauen drei

Größtes Thüringer Bürgerenergie-Projekt: Spatenstich für Solarpark in Göritzberg
In Göritzberg im Saale-Holzland-Kreis ist am Dienstag der 1. Spatenstich für einen Bürgersolarpark gesetzt worden. Auf einem ehemaligen Flugplatz soll er entstehen und Geld in die Kassen von Genossenschaftlern spülen.