Ion signals from laser produced plasmas (LPPs) generated inside aluminum rectangular cavities at a fixed depth d = 2 mm and varying width, x = 1.0, 1.6, and 2.75 mm were obtained by spatially varying the position of a negatively biased Langmuir probe. Damped oscillatory features superimposed on Maxwellian distributed ion signals were observed. Depending on the distance of the probe from the target surface, three to twelve fold enhancements in peak ion density were observed via confinement of the LPP, generated within rectangular cavities of varying width which constrained the plasma plume to near one dimensional expansion in the vertical plane. The effects of lateral spatial confinement on the expansion velocity of the LPP plume front, the temperature, density and expansion velocity of ions, enhancement of ion flux, and ion energy distribution were recorded. The periodic behavior of ion signals was analyzed and found to be related to the electron plasma frequency and electron-ion collision frequency. The effects of confinement and enhancement of various ion parameters and expansion velocities of the LPP ion plume are explained on the basis of shock wave theory.
Skip Nav Destination
Article navigation
September 2014
Research Article|
September 24 2014
Ion flux enhancements and oscillations in spatially confined laser produced aluminum plasmas
S. C. Singh;
S. C. Singh
a)
1National Centre for Plasma Science and Technology and School of Physical Sciences,
Dublin City University
, Dublin 9, Ireland
Search for other works by this author on:
C. Fallon;
C. Fallon
1National Centre for Plasma Science and Technology and School of Physical Sciences,
Dublin City University
, Dublin 9, Ireland
Search for other works by this author on:
P. Hayden;
P. Hayden
1National Centre for Plasma Science and Technology and School of Physical Sciences,
Dublin City University
, Dublin 9, Ireland
Search for other works by this author on:
M. Mujawar;
M. Mujawar
2
School of Physics, Trinity College
, Dublin 2, Ireland
Search for other works by this author on:
P. Yeates;
P. Yeates
1National Centre for Plasma Science and Technology and School of Physical Sciences,
Dublin City University
, Dublin 9, Ireland
Search for other works by this author on:
J. T. Costello
J. T. Costello
1National Centre for Plasma Science and Technology and School of Physical Sciences,
Dublin City University
, Dublin 9, Ireland
Search for other works by this author on:
a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]. Present address: Laser Spectroscopy and Nanomaterials Laboratory, Department of Physics, University of Allahabad, Allahabad 211002, India.
Phys. Plasmas 21, 093113 (2014)
Article history
Received:
May 31 2014
Accepted:
September 02 2014
Citation
S. C. Singh, C. Fallon, P. Hayden, M. Mujawar, P. Yeates, J. T. Costello; Ion flux enhancements and oscillations in spatially confined laser produced aluminum plasmas. Phys. Plasmas 1 September 2014; 21 (9): 093113. https://doi.org/10.1063/1.4895601
Download citation file:
Pay-Per-View Access
$40.00
Sign In
You could not be signed in. Please check your credentials and make sure you have an active account and try again.
Citing articles via
Progress toward fusion energy breakeven and gain as measured against the Lawson criterion
Samuel E. Wurzel, Scott C. Hsu
Weakly nonlinear incompressible Rayleigh–Taylor–Kelvin–Helmholtz instability in plane geometry
Zhen-Qi Zou, Jun-Feng Wu, et al.
Related Content
Laser ablation dynamics in liquid phase: The effects of magnetic field and electrolyte
J. Appl. Phys. (February 2015)
Time resolved anisotropic emission from an aluminium laser produced plasma
Phys. Plasmas (January 2017)