Study of magnetic confinement in laser-induced plasmas by optical emission spectroscopy and fast photography

X. K. Shen, Y. F. Lu, T. Gebre

Research output: Contribution to conferencePaper

Abstract

The dynamics and magnetic confinement effects of laser-induced plasmas expanding across an external transverse magnetic field were investigated by both optical emission spectroscopy and fast photography. KrF excimer laser pulses with a pulse duration of 23 ns and a wavelength of 248 nm were used to produce plasmas from Cu targets. Various optical emission lines show an obvious enhancement in the intensity of optical emission when a magnetic field of 0.8 Tesla is applied. Temporal evolution of the optical emission lines shows a continuous enhancement in emission intensity at time delays of 3-20 μs after the incident laser pulse. The enhancement in the optical emission from the Cu plasmas was presumably due to the increase in the effective plasma density as a result of magnetic confinement. Fast photography of the laser-induced Cu plasmas was performed using a Nikon macro lens and Andor intensified CCD camera. It shows that the plasma splits into two parts after gate delay of around 4 μs both with and without a magnetic field. With the presence of a magnetic field, the two parts of the plasma were confined and recombined with each other after gate delay of around 18 μs. While without the presence of a magnetic filed, the two parts kept separated as gate delay increased.

Original languageEnglish (US)
Publication statusPublished - Dec 1 2006
EventICALEO 2006 - 25th International Congress on Applications of Laser and Electro-Optics - Scottsdale, AZ, United States
Duration: Oct 30 2006Nov 2 2006

Conference

ConferenceICALEO 2006 - 25th International Congress on Applications of Laser and Electro-Optics
CountryUnited States
CityScottsdale, AZ
Period10/30/0611/2/06

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ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Electrical and Electronic Engineering

Cite this

Shen, X. K., Lu, Y. F., & Gebre, T. (2006). Study of magnetic confinement in laser-induced plasmas by optical emission spectroscopy and fast photography. Paper presented at ICALEO 2006 - 25th International Congress on Applications of Laser and Electro-Optics, Scottsdale, AZ, United States.