28 February 2011 Laser produced plasma expansion across transverse magnetic field
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Proceedings Volume 7996, Fundamentals of Laser-Assisted Micro- and Nanotechnologies 2010; 79960Y (2011) https://doi.org/10.1117/12.887238
Event: Fundamentals of Laser Assisted Micro- and Nanotechnologies 2010, 2010, St. Petersburg, Russian Federation
Abstract
A one-fluid, one-dimensional magneto-hydrodynamic (MHD) model is used to investigate the dynamics of magnetized laser produced plasma expanding into vacuum, just after the termination of the laser pulse. The created plasma plume is assumed to be fully ionized containing electrons and singly charged ions and considered to be under local thermodynamic equilibrium, allowing all charged particles to have same temperatures. A selfsimilar solution is found to describe the expansion of the plasma satisfying ideal time-dependant MHD equations where charge quasi-neutrality is assumed to prevail. The evolution of the transverse magnetic field is supposed to follow Faraday law and the set of obtained differential equations is closed with an ideal equation of state. The numerical results report the behaviour of the deduced plasma parameters like density, velocity and temperature as functions of the self-similarity variable for different increasing initial values of magnetic field. We find that the interaction of the plasma with the transverse magnetic field may cause significant changes in the plume expansion dynamics, including confinement of the plasma leading to the increase of particles arriving on the substrate. Velocity plasma increase is also observed due to the Lorentz force that accelerates the charges to move faster and further away from the target. The temperature of the plume is found to be larger compared to temperature in un-magnetized plasma, due to Joule heating and magnetic compression of the plume.
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Djamila Bennaceur-Doumaz, Djamila Bennaceur-Doumaz, Mourad Djebli, Mourad Djebli, } "Laser produced plasma expansion across transverse magnetic field", Proc. SPIE 7996, Fundamentals of Laser-Assisted Micro- and Nanotechnologies 2010, 79960Y (28 February 2011); doi: 10.1117/12.887238; https://doi.org/10.1117/12.887238
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