A5082256519- Ionosphere and magnetosphere dynamics
- Magnetic confinement fusion research
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Gyrotron and Vacuum Electronics Research
- Plasma Diagnostics and Applications
- Radio Wave Propagation Studies
- Millimeter-Wave Propagation and Modeling
- Seismic Waves and Analysis
- Laser-induced spectroscopy and plasma
- Terahertz technology and applications
- Precipitation Measurement and Analysis
- Fluid Dynamics and Turbulent Flows
- Vacuum and Plasma Arcs
- Optical Wireless Communication Technologies
- Laser Design and Applications
- Advanced Fiber Optic Sensors
- Laser-Plasma Interactions and Diagnostics
University of California, Los Angeles
2023
Institute for Plasma Research
2017-2019
Nirma University
2017-2019
Applied Research Laboratory at the University of Hawai‘i
1961
Orthogonality relations are given for the ``four-vector'' guided modes of anisotropic uniform wave guides and ``six-vector'' containing unidirectional electron beams with axially independent dc velocities. In general, these orthogonality involve both guide those an appropriate ``adjoint'' guide. A description is adjoint associated which contain media whose characteristics restricted only by requirement that they be which, if bounded, subject to a variety boundary conditions arising from...
Abstract We have studied the propagation of inertial Alfvén waves through parallel gradients in speed using Large Plasma Device at University California, Los Angeles. The reflection and transmission inhomogeneities background plasma are important for understanding wave propagation, turbulence, heating space, laboratory, astrophysical plasmas. Here we present under conditions relevant to solar flares corona. find that is reduced as sharpness gradient increased. Any reflected were below...
Experimental observations of a new regime whistler propagation in the laboratory are reported this paper. The experiments carried out large unbound uniform plasma with density ne ∼ 109–1011 cm−3 and magnetic field 1–20 G. Studies performed electron magnetohydrodynamic regime, which is governed by dynamics Le ≪ L Li τci ≫ τ τce, where spatial temporal scale lengths perturbations, ion Larmor radii, respectively, τce scales corresponding to gyrofrequency gyrofrequency, respectively. complete...
it is assumed that the coupling of quasi-iransverse elcctromagnetic (EM) waves and quasi-longitudinal spacecharge simulates a traveling-wave tube type interaction, so kinetic energy can be interchanged with EM energy. The plasma to have ability support slow waves; for plasmas oi electrons one kind ion near cyclotron frequencies, behaves in required fashion. Using this mechanism. runaway electron may used heating. (T.F.H.)
The influence of Larmor radius effects on the propagation whistler waves is investigated experimentally in laboratory plasma. are excited using a loop antenna diameter less than electron skin depth, natural scale length this regime. In an earlier experiment [G. Joshi et al., Phys. Plasmas 24, 122110 (2017)], it was shown that such assume elongated shape with perpendicular dimensions order depth. present work, we show wave significantly modified when external guiding magnetic field decreased....
Alfvén waves are important in many astrophysical and laboratory plasmas with complex inhomogeneous magnetic structures, such as the solar corona Earth's magnetosphere [1]. Investigating traveling through is essential for understanding turbulence, damping [2], heating [3]. In theory, wave predicted to reflect from speed gradient. a recent experiment [4], it was observed that kinetic (electron thermal >> speed) lose energy while propagating But, interestingly, no reflection observed. We...
A new regime of whistler wave propagation in a large laboratory unbounded uniform plasma has been identified. The exhibits interesting topological characteristics, an elongated structure and feeble resonance almost no obliqueness [1]. Conventionally, waves are known to exhibit complex three dimensional features with both parallel oblique propagation. However, the excited here show such feature. These characteristics attributed electron inertia effects [2] that starts playing significant role...