Electric field-perturbation measurement of the interaction between two laser-induced plasmas

The interaction between two ns-laser-induced plasmas in air at the early-stage of expansion has been analyzed by using a method based on the direct measurement of the perturbation of an externally applied electric field. In this experimental method, the plasmas were produced by focusing two laser be...

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Bibliographic Details
Published in:Review of scientific instruments 2012-02, Vol.83 (2), p.023504-023504-6
Main Authors: Sánchez-Aké, C., Bredice, F., Villagrán-Muniz, M.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AIR
BEAM-PLASMA SYSTEMS
CAPACITORS
CHARGE DISTRIBUTION
DIPOLES
Electric fields
ELECTRIC POTENTIAL
FOCUSING
LASER-PRODUCED PLASMA
PARTICLE ACCELERATORS
Perturbation methods
PHOTON BEAMS
PLASMA EXPANSION
Plasmas
Plates
RESISTORS
SHIELDING
TIME DELAY
Voltage
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Summary:The interaction between two ns-laser-induced plasmas in air at the early-stage of expansion has been analyzed by using a method based on the direct measurement of the perturbation of an externally applied electric field. In this experimental method, the plasmas were produced by focusing two laser beams between the plates of a parallel-plane-charged capacitor. These plasmas produce a perturbation in the electric field of the capacitor which can be measured as a voltage change across a resistor connected to the ground plate. It was found that for delays shorter than 5 ns, the interaction between plasmas is mainly due to the interaction of the dipole-charge distribution of each plasma. For longer time delays, the shielding effect was dominant.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.3683453