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Cherenkov radiation is the electromagnetic radiation emitted when a charged particle (such as an electron) passes through an insulator at a constant speed greater than the speed of light in that medium. In this article, we provide a simple, concise discussion about "Cherenkov radiation" which demonstrates the characteristic blue glow of an underwater nuclear reactor.
2018
Knowing the noise level measured in saline medium of-118dBm we designed and constructed a complex antenna system with which we measured the signals injected from a generator in this environment. Measurements made with the antenna system in saline environment, have highlighted the signal level of-61.5dBm, much lower than until now. Thus, the attenuation of the saline medium was determined for the horizontal plane compared to the previous measurements made for the vertical plane.
Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 2000
In conventional sources of coherent Cherenkov electromagnetic radiation, the electrons move linearly, guided by external magnetic fields. In the absence of such fields, the electrons can move radially, being affected by the beam self-fields as well as by the radial component of the electric field of the wave. This radial motion can, first, improve the coupling of electrons to the field of a slow wave localized near the wall of a slow-wave structure, and second, cause an energy exchange between the electrons and the wave due to an additional transverse interaction. This interaction, in particular, can lead to an experimentally observed excitation of nonsymmetric transverse electric waves in Cherenkov devices. In plasma-filled sources, the beam self-fields can be compensated for by ions, leading to a known ion focusing of the beams. In such regimes, the beam can be surrounded by an ion layer creating a potential well for electrons which can be displaced from stationary trajectories by...
IEEE Journal of Quantum Electronics, 1983
Optics letters, 2018
Cherenkov emission induced by external beam radiation from a clinical linear accelerator has been shown in preclinical molecular imaging and clinical imaging. The broad spectrum Cherenkov emission should have a short wavelength infrared (SWIR, 1000-1700 nm) component, as predicted theoretically. To the best of our knowledge, this Letter is the first experimental observation of this SWIR Cherenkov emission induced by external beam radiation. The measured spectrum of SWIR Cherenkov emission matches the theoretical prediction, with a fluence rate near one-third of the visible and near-infrared red emissions (Vis-NIR, 400-900 nm). Imaging in water-based phantoms and biological tissues indicates that there is a sufficient fluence rate for radiotherapy dosimetry applications. The spatial resolution is improved approximately 5.3 times with SWIR Cherenkov emission detection versus Vis-NIR Cherenkov emission, which provides some improvement in the potential for higher resolution Cherenkov em...
2021
It is interesting to note in recent years for a large number of researchers the topic of photonic crystals (PhCs) because of their new and useful properties. In addition, there are many advantages to photonic crystals materials as a high reflectance materials as well as the high transmittance materials based on the target application. The calculations were done for Aluminum oxide and titanium oxide (Al2O3/TiO2) composite photonic crystal in one dimension, which shows a high reflectivity (~ 99 %). The chosen photonic crystal composite can be useful to reflect the Cherenkov light many times which comes out from Cherenkov radiation by using radioisotope 90Sr-90Y. The output intensified light has power 1.45 µwatt and 1.45 nwatt for 90Sr-90Y with the activity 1Ci and 1mCi respectively, that can be used for micro/nano-power source applications.
Physical Review B, 2004
Optics Letters, 2012
Physics Letters A - PHYS LETT A, 2006
X-ray diffraction radiation from ultra-relativistic electrons moving near an absorbing target is considered. The emission yield is found to increase significantly in conditions of Cherenkov effect.
The European Physical Journal Plus, 2021
The beams of fast runaway electrons (RE), which are often produced during tokamak discharges, are particularly dangerous and can induce serious damages of the vacuum vessel and internal components of the machine. The proper and fast diagnostics of RE beams is essential for controlling the discharge, e.g., by early mitigation of disruptions and potentially dangerous RE beams. The diagnostics of RE beams is usually based on measurements of the radiation emitted either by these electrons, or as a result of their interactions with plasma and/or vessel walls. Such a radiation is usually recorded by the means of probes placed outside the vacuum vessel. The method developed by our team is based on the probe located inside the vacuum vessel. The probe can be used to detect highly localized RE bunches and to determine their spatial and temporal characteristics. During last few years, the NCBJ team have developed and used the RE diagnostics based on the Cherenkov effect observed in diamond ra...
Proceedings of 36th International Cosmic Ray Conference — PoS(ICRC2019), 2019
Presented at IASD's 3rd Many Worlds of Lucid Dreaming Conference, Oct 29 – Nov 12, 2022
International Journal of Cardiovascular Sciences, 2020
Nonlinear Analysis: Theory, Methods & Applications, 2009
United Nations University series on regionalism, 2024
Journal of Defense Management, 2014
Journal of Epidemiology, 2003
Peptides, 1984
Revista de investigación en educación, 2018
Atherosclerosis Supplements, 2010