Théorie du claquage de l'argon sous l'effet du rayonnement d'un laser

Cernuschi, F.; Rachman, Anung; Girotti, H. O.; Bassani, Luana Tais

doi:10.1051/jphys:01967002805-6040100

J. Phys. France

1967

DOI: 10.1051/jphys:01967002805-6040100

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Théorie du claquage de l'argon sous l'effet du rayonnement d'un laser

F. Cernuschi

Anung Rachman

H. O. Girotti

et al.

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1967

1972

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Cited by 5 publications

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“…(3) Integration is made in a region where T <Tj = (3p a /a) 1/4 , Tj being an upper limit of temperature. 9 Finally the temperature distribution, produced by the mean laser power P L , after breakdown is expressed by…”

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confidence: 99%

Local Thermodynamic Equilibrium Conditions in Superhigh-Pressure Helium Plasmas Produced by Laser Action

Rachman

Bassani

1969

Phys. Rev. Lett.

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Breakdown experiments in superhigh-pressure gases 1 irradiated by a focused Q-switched laser show a dependence of threshold electric field versus initial gas pressure in the rather large interval of 20 to 2000 atm. These curves present electric-field minima, which approximately agree with the values predicted by the wellknown theory of electron-impact ionization. In other kinds of experiments performed on laserproduced plasmas, 2 it has been shown that local thermodynamic equilibrium (LTE) conditions may be approximately attained in time intervals as short as the laser-pulse duration (-65-nsec half-width), working at energy density levels of 1000 J/cm 2 (power density ^1.5xl0 10 W/cm 2 ). Measurements made at that laser energy density show that the plasma electron temperature, the gas temperature, and the blackbody radiation temperature converge to the same limit.This Letter presents a theoretical analysis, attempting to define a unique local temperature T for electrons, ions, neutrals, and radiation, and to deduce a relation between threshold breakdown power, temperature, and pressure that may account for the experimental curves. 1 Different mechanisms have been proposed to explain the gas heating: the radiation-supported shock-wave process 3 ' 4 ; the traveling ionization-15 H. R. Schlossberg and A. Javan, Phys. Rev. 150, 267 (1966). 16 M. S. Feld and A. Javan, Phys. Rev. 177, 540 (1969).

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Local Thermodynamic Equilibrium Conditions in Superhigh-Pressure Helium Plasmas Produced by Laser Action

Rachman

Bassani

1969

Phys. Rev. Lett.

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Radiative equilibrium theory of breakdown of noble gases by laser action

Rachman¹,

Bassani²

1967

Physics Letters A

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On threshold conditions in superhigh-pressure laser-produced argon plasmas

Rachman

Marshal

1971

Physics Letters A

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Théorie du claquage de l'argon sous l'effet du rayonnement d'un laser

Cited by 5 publications

References 6 publications

Local Thermodynamic Equilibrium Conditions in Superhigh-Pressure Helium Plasmas Produced by Laser Action

Local Thermodynamic Equilibrium Conditions in Superhigh-Pressure Helium Plasmas Produced by Laser Action

Radiative equilibrium theory of breakdown of noble gases by laser action

On threshold conditions in superhigh-pressure laser-produced argon plasmas

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