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Plasma Physics by Manish Shukla
Molecular Dynamics (MD) simulation is carried out to examine the effect of particle confinement o... more Molecular Dynamics (MD) simulation is carried out to examine the effect of particle confinement on the pressure of 3D Yukawa gas. Confinement effects are taken into account by using perfectly reflecting boundary condition in MD simulations. An equation of state relating pressure to number density is obtained. The results of the MD simulations show that in weak coupling regime pressure of confined Yukawa gas is much bigger than the kinetic pressure and scales quadratically with number density. Results are compared with earlier theories and experiments which show quadratic scaling of dust pressure with density.
Papers by Manish Shukla
Physics of Plasmas, 2019
A three dimensional Molecular Dynamics (MD) simulation is carried out to explore the equilibrium ... more A three dimensional Molecular Dynamics (MD) simulation is carried out to explore the equilibrium configurations of charged dust particles. These equilibrium configurations are of astrophysical significance for the conditions of molecular clouds and the interstellar medium. The interaction among the dust grains is modeled by Yukawa repulsion and gravitational attraction. The spherically symmetric equilibria are constructed which are characterized by three parameters: (i) the number of particles in the cloud, (ii) Γg (defined in the text) where Γg−1 is the short range cutoff of the interparticle potential, and (iii) the temperature of the grains. The effects of these parameters on dust cloud are investigated using a radial density profile. The problem of equilibrium is also formulated in the mean field limit where total dust pressure, which is the sum of kinetic pressure and the electrostatic pressure, balances the self-gravity. The mean field solutions agree well with the results of ...
Physics of Plasmas, 2017
Molecular Dynamics (MD) simulations are carried out to examine the effect of particle confinement... more Molecular Dynamics (MD) simulations are carried out to examine the effect of particle confinement on the pressure of 3D Yukawa gas. Confinement effects are taken into account by using perfectly reflecting boundary conditions in MD simulations. An equation of state relating pressure to number density is obtained. The results of the MD simulations show that in the weak coupling regime, pressure of confined Yukawa gas is much larger than the kinetic pressure and scales quadratically with number density. The results are compared with earlier theories and experiments which show quadratic scaling of dust pressure with density.
A new method called `Configurational Temperature' is introduced in the context of dusty plasm... more A new method called `Configurational Temperature' is introduced in the context of dusty plasma, where the temperature of the dust particles, submerged in the plasma, can be measured directly from the positional information of the individual dust particles and the interaction potential between the dust grains. This method does not require the velocity information of individual particles which is a key parameter to measure the dust temperature in the conventional method. The technique is initially tested using two dimensional OpenMP parallel Molecular Dynamics and Monte-Carlo simulation and then verified with the temperature evaluating from the experimental data. The experiments have been carried out in Dusty plasma experimental (DPEx) device where a two dimensional stationary plasma crystal of melamine formaldehyde particles is formed in the cathode sheath of a DC glow discharge argon plasma. The dust kinetic temperature is calculated using standard PIV technique at different pre...
A new method called `Configurational Temperature' is introduced in the context of dusty plasm... more A new method called `Configurational Temperature' is introduced in the context of dusty plasma, where the temperature of the dust particles, submerged in the plasma, can be measured directly from the positional information of the individual dust particles and the interaction potential between the dust grains. This method does not require the velocity information of individual particles which is a key parameter to measure the dust temperature in the conventional method. The technique is initially tested using two dimensional OpenMP parallel Molecular Dynamics and Monte-Carlo simulation and then compared with the temperature evaluating from the experimental data. The experiments have been carried out in Dusty plasma experimental (DPEx) device where a two dimensional stationary plasma crystal of melamine formaldehyde particles is formed in the cathode sheath of a DC glow discharge argon plasma. The dust kinetic temperature is calculated using standard PIV technique at different pre...
Molecular Dynamics (MD) simulation is carried out to examine the effect of particle confinement o... more Molecular Dynamics (MD) simulation is carried out to examine the effect of particle confinement on the pressure of 3D Yukawa gas. Confinement effects are taken into account by using perfectly reflecting boundary condition in MD simulations. An equation of state relating pressure to number density is obtained. The results of the MD simulations show that in weak coupling regime pressure of confined Yukawa gas is much bigger than the kinetic pressure and scales quadratically with number density. Results are compared with earlier theories and experiments which show quadratic scaling of dust pressure with density.
Physics of Plasmas, 2019
A three dimensional Molecular Dynamics (MD) simulation is carried out to explore the equilibrium ... more A three dimensional Molecular Dynamics (MD) simulation is carried out to explore the equilibrium configurations of charged dust particles. These equilibrium configurations are of astrophysical significance for the conditions of molecular clouds and the interstellar medium. The interaction among the dust grains is modeled by Yukawa repulsion and gravitational attraction. The spherically symmetric equilibria are constructed which are characterized by three parameters: (i) the number of particles in the cloud, (ii) Γg (defined in the text) where Γg−1 is the short range cutoff of the interparticle potential, and (iii) the temperature of the grains. The effects of these parameters on dust cloud are investigated using a radial density profile. The problem of equilibrium is also formulated in the mean field limit where total dust pressure, which is the sum of kinetic pressure and the electrostatic pressure, balances the self-gravity. The mean field solutions agree well with the results of ...
Physics of Plasmas, 2017
Molecular Dynamics (MD) simulations are carried out to examine the effect of particle confinement... more Molecular Dynamics (MD) simulations are carried out to examine the effect of particle confinement on the pressure of 3D Yukawa gas. Confinement effects are taken into account by using perfectly reflecting boundary conditions in MD simulations. An equation of state relating pressure to number density is obtained. The results of the MD simulations show that in the weak coupling regime, pressure of confined Yukawa gas is much larger than the kinetic pressure and scales quadratically with number density. The results are compared with earlier theories and experiments which show quadratic scaling of dust pressure with density.
A new method called `Configurational Temperature' is introduced in the context of dusty plasm... more A new method called `Configurational Temperature' is introduced in the context of dusty plasma, where the temperature of the dust particles, submerged in the plasma, can be measured directly from the positional information of the individual dust particles and the interaction potential between the dust grains. This method does not require the velocity information of individual particles which is a key parameter to measure the dust temperature in the conventional method. The technique is initially tested using two dimensional OpenMP parallel Molecular Dynamics and Monte-Carlo simulation and then verified with the temperature evaluating from the experimental data. The experiments have been carried out in Dusty plasma experimental (DPEx) device where a two dimensional stationary plasma crystal of melamine formaldehyde particles is formed in the cathode sheath of a DC glow discharge argon plasma. The dust kinetic temperature is calculated using standard PIV technique at different pre...
A new method called `Configurational Temperature' is introduced in the context of dusty plasm... more A new method called `Configurational Temperature' is introduced in the context of dusty plasma, where the temperature of the dust particles, submerged in the plasma, can be measured directly from the positional information of the individual dust particles and the interaction potential between the dust grains. This method does not require the velocity information of individual particles which is a key parameter to measure the dust temperature in the conventional method. The technique is initially tested using two dimensional OpenMP parallel Molecular Dynamics and Monte-Carlo simulation and then compared with the temperature evaluating from the experimental data. The experiments have been carried out in Dusty plasma experimental (DPEx) device where a two dimensional stationary plasma crystal of melamine formaldehyde particles is formed in the cathode sheath of a DC glow discharge argon plasma. The dust kinetic temperature is calculated using standard PIV technique at different pre...