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      Measurement of temperature of a dusty plasma from configuration

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          Abstract

          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. We do not need the information of velocity of individual dust particles to measure the temperature in this technique. The method is initially tested using two and three dimensional OpenMP parallel Molecular Dynamics and Monte-Carlo simulation and finally experimantal data from DPEx device is fed into the new diagnostics and the results are compared with the standard PIV technique.

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          Thermodynamics of strongly‐coupled Yukawa systems near the one‐component‐plasma limit. II. Molecular dynamics simulations

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            Configurational temperature: Verification of Monte Carlo simulations

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              A configurational temperature Nosé-Hoover thermostat.

              We propose two new thermostats which can be employed in computer simulations to ensure that two different variants of the configurational temperature fluctuate around their equilibrium values. These new thermostats differ from one previously introduced by Delhommelle and Evans [Mol. Phys. 99, 1825 (2001)] in several important ways. First, our thermostats are derived in the same spirit as the Nosé-Hoover thermostat and therefore generate the canonical phase-space distribution. Second, our thermostats involve simpler equations of motion, which do not involve spatial gradients of the configurational temperature. They do not suffer from problems stemming from stiff equations of motion and furthermore, in large temperature perturbation simulations, the measured temperature follows the set-point temperature without any overshoot, and with good damping of oscillations. We show that both of our configurational thermostats are special cases of a more general set of Nosé-Hoover equations proposed by Kusnezov et al. [Ann. Phys. 204, 155 (1990)]. The new thermostats are expected to be highly useful in nonequilibrium simulations, particularly those characterized by spatial inhomogeneities. They should also find applicability in simulations involving large changes in temperature over small time scales, such as temperature quench molecular dynamics and radiation damage modeling.
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                Author and article information

                Journal
                04 June 2019
                Article
                1906.01319
                b01ca852-5a45-4877-a1c7-8a519b3bd0f0

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Custom metadata
                physics.plasm-ph physics.comp-ph

                Plasma physics,Mathematical & Computational physics
                Plasma physics, Mathematical & Computational physics

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