IPAC2014 - List of Authors (Gupta, D.N.)

Paper	Title	Page
TUPME075	Simulations on Laser Wakefield Generation in a Parabolic Magnetic-plasma Channel	1528
	D.N. Gupta, M. Singh University of Delhi, Delhi, India D. Jang, H. Suk APRI-GIST, Gwangju, Republic of Korea B.S. Sharma Kota University, Rajasthan, India
	To utilize the laser-plasma channel for laser wakefield acceleration, we have studied the non-paraxial theory of nonlinear propagation of ultra-intense relativistic Gaussian laser pulse in a preformed spatially tapered magneto-plasma channel having a parabolic density profile. A three-dimensional envelope equation for the laser field is derived, which includes the non-paraxial and applied magnetic field effects. An analytical expression for the wakefield is derived and analyzed the results with the help of particle-in-cell (PIC) simulations. It is shown that wakefield structures and the phase of axial component of the wakefield depend on applied external magnetic field. This aspect of theoretical observation can be used in the production of highly collimated mono-energetic x-rays.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME075
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THPRO064	Effect of Laser-plasma Channeling on Third-harmonic Radiation Generation	3023
	M. Singh, D.N. Gupta University of Delhi, Delhi, India
	An intense Gaussian laser beam, propagating through a magnetized plasma, becomes self-focused due to the ponderomotive force on the electrons. The magnetic field reduces the radius of the laser beam and enhances the self focusing of the laser beam. The self-sustained plasma channel can affect the efficiency of harmonic generation of the interacting laser beam. The radial density gradient of the channel beats with the oscillatory electron velocity to produce density perturbation at laser frequency. The ponderomotive force at second-harmonic frequency produces electrons density oscillations that beat with the oscillatory velocity to create a non-linear current, driving the third harmonic radiation. The velocity and density perturbation associated with the self-focused laser beam generates a nonlinear current at triple fold frequency of the fundamental laser. Our results show that the efficiency of third-harmonic generation of the laser beam is affected significantly due to the self-sustained plasma channel. The strength of magnetic field play a crucial role in efficiency enhancement of third-harmonic generation.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO064
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Simulations on Laser Wakefield Generation in a Parabolic Magnetic-plasma Channel

1528

D.N. Gupta, M. Singh
University of Delhi, Delhi, India
D. Jang, H. Suk
APRI-GIST, Gwangju, Republic of Korea
B.S. Sharma
Kota University, Rajasthan, India

To utilize the laser-plasma channel for laser wakefield acceleration, we have studied the non-paraxial theory of nonlinear propagation of ultra-intense relativistic Gaussian laser pulse in a preformed spatially tapered magneto-plasma channel having a parabolic density profile. A three-dimensional envelope equation for the laser field is derived, which includes the non-paraxial and applied magnetic field effects. An analytical expression for the wakefield is derived and analyzed the results with the help of particle-in-cell (PIC) simulations. It is shown that wakefield structures and the phase of axial component of the wakefield depend on applied external magnetic field. This aspect of theoretical observation can be used in the production of highly collimated mono-energetic x-rays.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME075

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRO064

Effect of Laser-plasma Channeling on Third-harmonic Radiation Generation

3023

M. Singh, D.N. Gupta
University of Delhi, Delhi, India

An intense Gaussian laser beam, propagating through a magnetized plasma, becomes self-focused due to the ponderomotive force on the electrons. The magnetic field reduces the radius of the laser beam and enhances the self focusing of the laser beam. The self-sustained plasma channel can affect the efficiency of harmonic generation of the interacting laser beam. The radial density gradient of the channel beats with the oscillatory electron velocity to produce density perturbation at laser frequency. The ponderomotive force at second-harmonic frequency produces electrons density oscillations that beat with the oscillatory velocity to create a non-linear current, driving the third harmonic radiation. The velocity and density perturbation associated with the self-focused laser beam generates a nonlinear current at triple fold frequency of the fundamental laser. Our results show that the efficiency of third-harmonic generation of the laser beam is affected significantly due to the self-sustained plasma channel. The strength of magnetic field play a crucial role in efficiency enhancement of third-harmonic generation.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO064

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)