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Formation of periodic magnetic field structures in overdense plasmas

Published online by Cambridge University Press:  11 July 2017

Deep Kumar Kuri ,
Nilakshi Das  and
Kartik Patel
Deep Kumar Kuri*
Affiliation:
Department of Physics, Tezpur University, Tezpur, Assam 784028, India
Nilakshi Das
Affiliation:
Department of Physics, Tezpur University, Tezpur, Assam 784028, India
Kartik Patel
Affiliation:
Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai-400085, India
*
*Address correspondence and reprint requests to: Deep Kumar Kuri, Department of Physics, Tezpur University, Tezpur, Assam 784028, India. E-mail: [email protected]
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Abstract

The role played by the angle of incidence of a short pulse laser in the generation of magnetic field via Weibel instability from overdense plasmas is investigated with the help of three-dimensional particle-in-cell simulations. The simulations have been done for different cases by varying the angle of incidence. When the laser pulse is incident normally (θ = 0°), it gets self-focused at a very short distance and the axial intensity rises up to several times the fundamental laser intensity. Strong current filamentation is observed, which causes the generation of high magnetic fields across the current filament. When the laser is incident obliquely at θ = 30° and 60°, periodic density ripple-like structures are formed on the plasma surface which is due to emission of energetic electron jets caused by vacuum heating. The periodic structures carry forward and return currents, which results in the formation of periodic magnetic field structures having strong magnetic fields. At θ = 60°, the inter spacing distance coincides with the incident laser wavelength. The magnetic energy is found to be highest in case of normal incidence, which is due to strong current filamentation. The filamentation becomes weaker as the angle of incidence is increased.

Keywords

LaserOblique incidenceOverdense plasmaPeriodic magnetic field generation
Type
Research Article
Information
Laser and Particle Beams , Volume 35 , Issue 3 , September 2017 , pp. 467 - 475
Copyright
Copyright © Cambridge University Press 2017 

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