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We numerically investigate the acceleration and bunch compression capabilities of 20 mJ, 0.6 THz-centered coherent terahertz pulses in optimized metallic dielectric-loaded cylindrical waveguides. In particular, we theoretically demonstrate the acceleration of 1.6 pC and 16 pC electron bunches from 1 MeV to 10 MeV over an interaction distance of 20mm, the compression of a 1.6 pC 1 MeV bunch from 100 fs to 2 fs (50 times compression) over an interaction distance of about 18mm, and the compression of a 1.6 pC 10 MeV bunch from 100 fs to 1.61 fs (62 times) over an interaction distance of 42 cm. The obtained results show the promise of coherent THz pulses in realizing compact electron acceleration and bunch compression schemes.
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http://dx.doi.org/10.1364/OE.21.009792 | DOI Listing |
Phys Rev Lett
July 2025
Hiroshima University, Graduate School of Advanced Science and Engineering, Higashihiroshima, 739-8521, Japan.
We propose an experimentally feasible approach for observing the Fulling-Davies-Unruh effect in circular motions using a novel detector based on the thermally activated decay of metastable bunched fluxon-antifluxon pairs in coupled annular Josephson junctions. The uniform circular motion of fluxon pairs acting as detectors under relativistic velocities and small radii produces high acceleration, making an effective Unruh temperature on the order of 1 K observable with existing technologies. In addition, the newly designed detector delivers highly sensitive temperature measurements, offering a promising avenue for experimentally probing the nontrivial properties of the quantum vacuum.
View Article and Find Full Text PDFEur Biophys J
July 2025
Department of Physics, University of Rome Tor Vergata and INFN, Via della Ricerca Scientifica 1, 00133, Rome, Italy.
The EuPRAXIA project is a European initiative aimed at developing groundbreaking, ultra-compact accelerator research infrastructures based on novel plasma acceleration concepts. The EuPRAXIA@SPARC_LAB facility, located in the Italian National Institute for Nuclear Physics-Frascati National Laboratory, will be the first operating Free Electron Laser facility of EuPRAXIA, based on an accelerator module driven by an electron bunch driver. The Free Electron Laser will produce ultra-short photon pulses in the soft X-ray region.
View Article and Find Full Text PDFJ Chem Phys
July 2025
Institute of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8573, Japan.
We developed an ultrafast time-resolved electron diffractometer with a tungsten probe photocathode. High transverse coherence and short-pulsed electrons were generated from a tungsten tip with a diameter of 1 μm. The transverse coherence length and duration of the electron pulses accelerated to 45 keV were experimentally and numerically characterized under high electron density conditions.
View Article and Find Full Text PDFJ Colloid Interface Sci
December 2025
College of Smart Energy, Shanghai Jiao Tong University, Shanghai 200240, China. Electronic address:
Rechargeable magnesium-ion batteries (RMBs) exhibit distinct advantages, such as superior theoretical capacity, economic viability, and enhanced safety features, making them a promising alternative to traditional energy storage systems. Nevertheless, the current research of high-performance RMBs is still fraught with many shortcomings of the unexpected actual capacity, poor cycling stability rapid energy decay, and a relatively short lifespan. Herein, Grape-bunch CoS/Te materials are prepared by one-step metal sulfide template-free anion-doped solvent-thermal synthesis.
View Article and Find Full Text PDFSci Rep
June 2025
Bundesamt für Strahlenschutz (BfS), Oberschleißheim, Germany.
The pulsed nature of laser-driven ion sources and their relative large emission angles result in the production of secondary, undesired, pulsed neutron (and photon) radiation. Conventional neutron monitors struggle to accurately measure in such environments, yet characterizing these fields is crucial for applications like hadron therapy. Parasitic neutron dose measurements were performed at the Petawatt beam of the Dresden Laser Acceleration Source (DRACO) employing laser energies from 4.
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