A5038259566- Dust and Plasma Wave Phenomena
- Ionosphere and magnetosphere dynamics
- Laser-Plasma Interactions and Diagnostics
- Solar and Space Plasma Dynamics
- Plasma Diagnostics and Applications
- Laser-Matter Interactions and Applications
- Earthquake Detection and Analysis
- Astro and Planetary Science
- Laser-induced spectroscopy and plasma
- Planetary Science and Exploration
- High-pressure geophysics and materials
- Atomic and Molecular Physics
- Orbital Angular Momentum in Optics
- Magnetic confinement fusion research
- Plasma Applications and Diagnostics
- Electrostatic Discharge in Electronics
- Astrophysics and Star Formation Studies
- Metal and Thin Film Mechanics
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced X-ray Imaging Techniques
- Optical Wireless Communication Technologies
- Optical properties and cooling technologies in crystalline materials
- Superconducting Materials and Applications
- Electrohydrodynamics and Fluid Dynamics
- Particle accelerators and beam dynamics
Physical Research Laboratory
2015-2025
Institute for Plasma Research
2012-2024
ELI-HU Research and Development Non-Profit
2016-2019
Central Electronics Engineering Research Institute
2019
Indian Institute of Technology Delhi
2015
Tata Institute of Fundamental Research
2014
Devi Ahilya Vishwavidyalaya
2014
University of Lucknow
2007-2012
Awadhesh Pratap Singh University
2004
Convective vortices that are dust-laden (dust devils) common features on Mars and believed to be an efficient mechanism for dust entrainment in the Martian atmosphere. The dust, which exhibits vertical lateral size distributions within devils, gets charged due triboelectric charging. charge separation this process weak atmospheric conductivity might yield a massive buildup large electric fields vortex. For certain dust-atmospheric conditions, its magnitude is shown exceed breakdown value,...
This paper presents an investigation of the charging dust particles in a dusty plasma, irradiated by white light near space at satellite altitudes. In deference to recent emphasis on character openness is based balance number density and energy electrons, ions, neutral as well charge neutrality condition. The accretion electrons/ions emission electrons particles, ionization recombination binary collisions between atoms are processes considered herein; exchange associated with these has also...
Abstract This paper presents an investigation of the focusing dark hollow Gaussian electromagnetic beams (HGB) in plasma, considering collisional, ponderomotive, and relativistic nonlinearities. A paraxial like approach, which parameters are expanded, terms radial distance from maximum irradiance rather than that axis, has been adopted. To highlight nature focusing, both critical curves divider have obtained as a plot dimensionless radius vs. power beam. The effect order HGB ( n ),...
Abstract Photoelectron sheath formation and subsequent fine dust levitation over the sunlit lunar regolith have been investigated by consistently accounting for continuous interaction of solar wind radiation with Moon. In deriving photoelectron sheath, Poisson equation is coupled latitude-dependent population density Fermionic photoelectrons. The altitude latitude profiles electric potential, field, electron within derived. A larger predicted near terminator compared to subsolar point....
This paper presents an analytical model for the physical understanding of charging cylindrical dust particles in open complex plasma system. Two different mechanisms, viz., thermionic emission and photoelectric have been considered electron generation from charged particles; corresponding expressions rate electrons their mean energy derived. A simple approach has adopted to derive expression accretion particle. Further a new associated with accreted due particle derived presented. An...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation M. S. Sodha, Shikha Misra, K. Mishra; Kinetics of complex plasmas having spherical dust particles with a size distribution. Phys. Plasmas 1 November 2010; 17 (11): 113705. https://doi.org/10.1063/1.3494215 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks...
Optical beams with null central intensity have potential applications in the field of atom optics. The spatial and temporal evolution a shadow dark hollow Gaussian (DHG) relativistic laser pulse propagating plasma is studied this article for first principles. A nonlinear Schrodinger-type equation obtained beam spot profile then solved numerically to investigate propagation characteristics. As series numerical simulations are employed trace focused compressed DHG as it propagates through...
The decision to launch Luna Glob and Resus satellites, carrying instrumentation investigate the structure of photoelectron sheath levitation dust particles in sheath, adjacent surface moon has intensified interest this exciting area. present analysis incorporates following novel features: (i) In contrast intuitive half Maxwellian (M) distribution velocities photoelectrons, emitted from moon, which corresponds an arbitrary temperature, a well-established Fermi Dirac (F-D) [R. H. Fowler, Phys....
The Capacitively Coupled Plasma discharge featuring operation in current driven triple frequency configuration has analytically been investigated, and the outcome is verified by utilising 1D3V particle-in-cell (PIC) simulation code. In this analysis, role of middle component applied signal precisely explored. parameters are seen to be sensitive ratio chosen lower higher frequencies for fixed amplitudes three components. On basis analysis PIC results, demonstrated act as additional control...
This article presents a paraxial theory of ring formation as an initially Gaussian beam propagates in nonlinear plasma, characterized by significant collisional or ponderomotive nonlinearity. Regions the axial irradiance-(beamwidth)−2 space, for which occurs and is valid, have been characterized; typical points these regions dependence width parameter radial distribution irradiance on distance has specifically investigated discussed.
This paper presents an analysis and subsequent discussion of the phenomena self-focusing single electromagnetic Gaussian beams cross-focusing multiple coaxial in fully ionized magnetoplasma, taking into account Ohmic heating electrons by loss energy due to collision with ions electronic thermal conduction; gained has been equated lost on ionic conduction. It is seen that inclusion conduction reduces self/cross-focusing for high values magnetic field (νe≪Ωc) enhances same low (νe≫ωc); here νe...
A high-fidelity synthetic diagnostic has been developed for the ITER core x-ray crystal spectrometer based on ray tracing. This used to model expected performance of diagnostic, aid in design, and develop engineering tolerances. The is tracing using recently xicsrt code includes a fully three-dimensional representation computer aided design. modeled components are: plasma geometry emission profiles, highly oriented pyrolytic graphite pre-reflectors, spherically bent crystals, pixelated...
In this paper Mie scattering of light by dust particles having Mathis, Rumpl, and Nordsieek power law distribution size has been incorporated in the formulation kinetics an illuminated complex plasma which takes into account ionization neutral atoms external agency, ion-electron recombination, photoemission electrons particles, accretion ions on surface particles; number energy balance constituent species also taken account. An interesting conclusion is that unlike usual case (when...
Collisionless heating of the electrons in vicinity sheath region corresponding to higher order sinusoidal signals a current-driven radio-frequency capacitively coupled plasma discharge has been investigated analytically and further verified by particle-in-cell simulation. The simulation results for collisionless are found be good agreement with analytical predictions. In contrast voltage driven case, it is demonstrated that pure waveform gives maximum electron configuration ion energy can...
ABSTRACT An analytical investigation of the sheath formation over sunlit moon under influence observed solar ultraviolet/extreme ultraviolet radiation and wind plasma has been presented. Poisson’s equation is coupled with latitude-dependent Fermionic photoelectrons, non-Maxwellian electrons cold ions to derive electric potential, field, population density profiles within photoelectron sheath. We notice that high-energy photons spectra in addition Lyman- α, significantly contribute...
This paper presents a theoretical model for the propaga- tion of hollow Gaussian electromagnetic beam (HGB), propagating in plasma with dominant relativistic-ponderomotive nonlinearity. A paraxial like approach has been invoked to understand nature propagation; this all relevant parameters correspond narrow range around irradiance maximum HGB. The critical curves propagation various order HGBs have discussed, and dependence width parameter on dis- tance evaluated three typical cases viz....
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation M. S. Sodha, K. Mishra, Shikha Misra, Sweta Srivastava; Fluctuation of charge on dust particles in a complex plasma. Phys. Plasmas 1 July 2010; 17 (7): 073705. https://doi.org/10.1063/1.3457929 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex...
The analytical prediction of the presence transient electric field regions between bulk plasma and sheath edge in radio frequency capacitively coupled (RF-CCP) discharges has been reported by Kaganovich [Phys. Rev. Lett. 89, 265006 (2002)]. In this paper, we have used semi-infinite particle-in-cell (PIC) simulation technique to verify theoretical for existence linear regime; it is shown that PIC results are good agreement with predicted model regime. It also demonstrated theory overestimates...
This paper presents an analytical model for the physical understanding of charge distribution on dust particles in meso-thermal flow plasmas where speed plasma relative to particle is larger than ion thermal but much less electrons. The formulation based master difference equation population balance and number energy considerations, allowing be only integral multiple (positive or negative) electronic charge. kinetics (i) dark complex accretion electrons/ionic species are dominant charging...
The formation of a photoelectron sheath over the lunar surface and subsequent dust levitation, under influence solar wind plasma continuous radiation, has been analytically investigated. characteristics have evaluated using Poisson equation configured with population density contributions from half Fermi-Dirac distribution photoemitted electrons simplified Maxwellian statistics plasma; as consequence, altitude profiles for electric potential, field, within derived. expression accretion rate...
This paper presents an analytical study of the distribution charge on particles in a complex plasma; is based statistical mechanics and ensures that integral multiple electronic charge. The formulation incorporates both number energy balance electrons/ions. Three specific cases charging have been considered, namely (i) plasma absence electron emission from particles, (ii) thermal equilibrium (iii) irradiated by monochromatic radiation, causing photoelectric electrons particles. effect...
A theoretical kinetic model for the physical understanding of charging dust particles in interplanetary space plasma has been developed. In contrast to earlier studies, present analysis incorporates (i) uniform potential theory complex plasmas with size distribution particles, (ii) charge, number and energy balance constituents (iii) appropriate expressions photoelectric emission from a positively charged particle inherent charge neutrality plasma. Further utilizing population equation...
Sunlight scattering from electrostatically charged floating particles is considered accountable for the lunar twilight observations of horizon glow and streamers. In this work, dynamics fine within photoelectron sheath over sunlit surface has been investigated. Accounting influence solar radiation, wind plasma, gravity, present transport model consistently takes account coexisting phenomenon particle charging, characteristic screening in deriving vertical motion particle. As novel features,...