Self-initiated volume discharge in mixtures of SF6 with hydrocarbons to excite nonchain hf lasers

Victor V. Apollonov; Andrei A. Belevtsev; Konstantin N. Firsov; Sergey Yu. Kazantsev; Alexei V. Saifulin

doi:10.1117/12.383472

24 April 2000 Self-initiated volume discharge in mixtures of SF₆ with hydrocarbons to excite nonchain hf lasers

Victor V. Apollonov, Andrei A. Belevtsev, Konstantin N. Firsov, Sergey Yu. Kazantsev, Alexei V. Saifulin

Proceedings Volume 4071, International Conference on Atomic and Molecular Pulsed Lasers III; (2000) https://doi.org/10.1117/12.383472
Event: International Conference on Atomic and Molecular Pulsed Lasers III, 1999, Tomsk, Russian Federation

Abstract

The paper studies a self-sustained volume discharge without preionization-self-initiated volume discharge (SIVD)--to excite non-chain HF lasers on SF₆-C₂H₆ mixtures. Once initiated by a local discharge gap breakdown, SIVD is found to propagate then over the whole gap normally to the applied electric field through successively starting diffuse overlapping channels at a voltage close to the quasi- stationary value. With forming new channels, the current through those previously originated decreases. The volume occupied by SIVD tends to expand with increasing the energy released within the discharge plasma, whereas a discharge bounded by a dielectric surface shows a simultaneous increase both in burning voltage and current. All these features combined allow a concept to be put forward of the existence of certain restriction mechanisms depending on the specific energy released and not permitting the total deposited energy to pass through a single channel. It is suggested that SF₆ dissociation by electron impact and the electron attachment to vibrationally excited SF₆ molecules are just those mechanisms. Simple analytical models have been developed allowing these mechanisms to be qualitatively described.

Citation Download Citation

Victor V. Apollonov, Andrei A. Belevtsev, Konstantin N. Firsov, Sergey Yu. Kazantsev, and Alexei V. Saifulin "Self-initiated volume discharge in mixtures of SF₆ with hydrocarbons to excite nonchain hf lasers", Proc. SPIE 4071, International Conference on Atomic and Molecular Pulsed Lasers III, (24 April 2000); https://doi.org/10.1117/12.383472

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