Plasma Dynamics and Lasing Condition of Fast Capillary Discharges

AbstractPlasma dynamics critically depends on density and temperature, thus well-controlled experimental realizations are essential benchmarks for theoretical models. The formation of an ultracold plasma can be triggered by ionizing a tunable number of atoms in a micrometer-sized volume of a 87Rb Bose-Einstein condensate (BEC) by a single femtosecond laser pulse. The large density combined with the low temperature of the BEC give rise to an initially strongly coupled plasma in a so far unexplored regime bridging ultracold neutral plasma and ionized nanoclusters. Here, we report on ultrafast cooling of electrons, trapped on orbital trajectories in the long-range Coulomb potential of the dense ionic core, with a cooling rate of 400 K ps−1. Furthermore, our experimental setup grants direct access to the electron temperature that relaxes from 5250 K to below 10 K in less than 500 ns.

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Mesh Refinement Based Simulation of Complex Plasma Dynamics during High Power Millimeter Wave Breakdown

2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO) ◽

10.1109/nemo49486.2020.9343429 ◽

2020 ◽

Author(s):

Pratik Ghosh ◽

Bhaskar Chaudhury

Keyword(s):

Millimeter Wave ◽

High Power ◽

Mesh Refinement ◽

Plasma Dynamics ◽

Complex Plasma ◽

Wave Breakdown

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Langevin approach to plasma kinetics with Coulomb collisions

Journal of Plasma Physics ◽

10.1017/s0022377898007363 ◽

1999 ◽

Vol 61 (1) ◽

pp. 89-106 ◽

Cited By ~ 30

Author(s):

M. G. CADJAN ◽

M. F. IVANOV

Keyword(s):

Laser Pulses ◽

Intense Laser ◽

Plasma Parameters ◽

Plasma Dynamics ◽

Coulomb Collisions ◽

Numerical Tests ◽

Langevin Approach ◽

Intense Laser Radiation ◽

Overdense Plasma ◽

Kinetics Of

The Langevin approach to the kinetics of a collisional plasma is developed. Some collision models are considered, and the corresponding stochastic differential equations are derived. These equations can be regarded as an alternative to the description of a plasma in terms of a distribution function. The method developed here allows one to simulate plasma processes, taking account of both collective kinetics effects and Coulomb collisions. Results of the numerical simulation of the intervention of laser pulses with an overdense plasma are presented. The dependence of the absorption coefficient on the plasma parameters is calculated. The features of the plasma dynamics under the action of intense laser radiation are observed and discussed. The results of numerical tests of the validity of this method are also presented.

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