TITLE

Temporal evolution of the shock wave and hot core air in laser induced plasma

AUTHOR(S)
Sobral, Hugo; Villagrán-Muniz, Mayo; Navarro-González, Rafael; Raga, Alejandro C.
PUB. DATE
November 2000
SOURCE
Applied Physics Letters;11/13/2000, Vol. 77 Issue 20
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The temporal evolution of electric breakdown in air at atmospheric pressure by Nd:yttrium-aluminum-garnet Q-switched nanosecond laser pulses was studied from the nanosecond to the millisecond time scale by shadowgraphy and interferometry techniques. The results were modeled with a gasdynamic code with good agreement. It was possible to simultaneously model the whole evolution of the plasma, the shock wave, and the hot core air. The shock wave velocity was determined to be >=60 km s[sup -1] at 20 ns. The plasma temperature was found to reach about 1.7x10[sup 4] K at 1 μs and the hot core air temperature was determined to be <10[sup 3] K at 100 μs. This letter presents an experimental work that extends the study of laser induced plasmas to millisecond time scales. © 2000 American Institute of Physics.
ACCESSION #
4413889

 

Related Articles

  • Features of development of optical breakdown on an inclined aluminum surface. Ilyin, A.; Nagorny, I.; Bukin, O.; Bulanov, A.; Shmirko, K. // Technical Physics Letters;Nov2012, Vol. 38 Issue 11, p975 

    It is shown that the air breakdown region and the erosion torch during an inclined fall of the laser radiation on the target are separated in time and space-namely, the electron density is higher in the region of the air breakdown, while the concentration of aluminum atoms is higher in the...

  • Gas-jet target generates debris-free plasma. Lewotsky, Kristin // Laser Focus World;Nov96, Vol. 32 Issue 11, p18 

    Focuses on the use of gas jet instead of a solid target to eliminate debris-producing sputtering associated with solid targets of laser-generated EUV plasma. Throad diameters for the supersonic nozzles; Cooling yoke.

  • Statistical Study of Nanosecond Electric Breakdowns in n-Hexane. Klimkin, V. F. // Technical Physics;Sep2002, Vol. 47 Issue 9, p1106 

    Methods for analyzing statistical distributions of the breakdown delay time are generalized. A statistical approach is used to study electric breakdown in n-hexane in a 2.1-MV/cm quasi-uniform electric field at a pulse duration of ∼5 × 10[sup -8] s. Two different mechanisms for the...

  • Sonoluminescence: A new electrical breakdown hypothesis. Garc�a, N.; Levanyuk, A. P. // JETP Letters;12/25/96, Vol. 64 Issue 12, p907 

    We discuss an hypothesis wherein single-bubble sonoluminescence is attributed to electrical breakdown due to large pressure gradients existing for small bubble radii. These large gradients produce large electric fields (the flexoelectric effect) that lead to electrical breakdown, releasing...

  • Generation of Strong Langmuir Fields during Optical Breakdown of a Dense Gas. Vvedenskii, N. V.; Gildenburg, V. B. // JETP Letters;9/25/2002, Vol. 76 Issue 6, p380 

    Results are presented from theoretical studies and computer simulations of the resonant excitation of Langmuir waves during the ionization of a homogeneous gas by high-intensity laser radiation. Two mechanisms for the formation of nonuniform resonant structures in the discharge are examined:...

  • Soft breakdown in ultrathin gate oxides: Correlation with the percolation theory of nonlinear conductors. Houssa, M.; Nigam, T.; Mertens, P. W.; Heyns, M. M. // Applied Physics Letters;7/27/1998, Vol. 73 Issue 4 

    The dielectric breakdown under constant current stressing of 4.2 nm SiO[sub 2] gate oxides is investigated. After soft breakdown, which corresponds to an anomalous increase of the stress-induced leakage current of metal–oxide–semiconductor capacitors, the current behaves like a...

  • Soft breakdown fluctuation events in ultrathin SiO[sub 2] layers. Miranda, E.; Sun˜e´, J.; Rodri´guez, R.; Nafri´a, M.; Aymerich, X. // Applied Physics Letters;7/27/1998, Vol. 73 Issue 4 

    When an ultrathin (<5 nm) oxide is subjected to electrical stress, several soft-breakdown events can occur prior to the final dielectric breakdown. After the occurrence of such failure events, the current–voltage (I–V) characteristic corresponds to the superposition of highly...

  • Long Laser Spark and Electric Gas Breakdown. Shelobolin, A. V. // Plasma Physics Reports;Apr2000, Vol. 26 Issue 4, p320 

    Initiation of electric air breakdown under normal conditions by a long laser spark is studied experimentally. A qualitative model explaining the effects observed is presented. � 2000 MAIK �Nauka / Interperiodica�.

  • Mechanism for Electric Breakdown in a Chemically Nonequilibrium System and the Influence of the Chain Oxidation Reaction in an H[sub 2]�Air Mixture on the Breakdown Threshold. Kosarev, I. N.; Starikovskii, A. Yu. // Plasma Physics Reports;Aug2000, Vol. 26 Issue 8, p701 

    A mathematical model is developed and a numerical analysis is performed for an electric breakdown in a hydrogen�air mixture with a low concentration of H[sub 2]. It is shown that, at sufficiently low pressures p < 10[sup �2] atm, a small molecular-hydrogen additive (? = 5�10[sup...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics