Title :
Light scattering measurements of energy partitioning in laser air sparks
Author :
Limbach, Christopher M. ; Miles, Richard B.
Author_Institution :
Princeton Univ., Princeton, NJ, USA
Abstract :
Laser light scattering provides a powerful diagnostic of plasmas and fluids in the form of Thomson and Rayleigh scattering1. In this work, we present time and space resolved collective Thomson scattering measurements of Te and ne in the plasma core of atmospheric pressure air sparks generated with a 10ns pulse, 1064nm Nd:YAG laser. In the shockwave region, a combination of Rayleigh scattering and Filtered Rayleigh scattering are used to spatially and temporally resolve temperature, radial velocity and density. Filtered Rayleigh scattering is a technique whereby scattered light is spectrally filtered by an atomic or molecular gas to indirectly extract line shape information. These measurements cover a laser energy range of 30mJ to 100mJ and a temporal duration of 1-5μs after spark formation.
Keywords :
Rayleigh scattering; plasma density; plasma diagnostics; plasma shock waves; plasma temperature; sparks; Nd:YAG laser; atmospheric pressure; atomic gas; energy 30 MJ to 100 MJ; energy partitioning; filtered Rayleigh scattering; laser air sparks; laser energy range; light scattering measurement; molecular gas; plasma density; plasma diagnostic; plasma temperature; pressure 1 atm; radial velocity; shock wave; space resolved collective Thomson scattering; spark formation; time 1 mus to 5 mus; time 10 ns; time resolved collective Thomson scattering; wavelength 1064 nm; Energy measurement; Measurement by laser beam; Plasma measurements; Plasmas; Scattering; Sparks; Temperature measurement;
Conference_Titel :
Plasma Sciences (ICOPS) held with 2014 IEEE International Conference on High-Power Particle Beams (BEAMS), 2014 IEEE 41st International Conference on
Conference_Location :
Washington, DC
Print_ISBN :
978-1-4799-2711-1
DOI :
10.1109/PLASMA.2014.7012262
