Volume-discharge formed in SF6 and C2H6 mixtures without preionization

Ge Zhang; Changjun Ke; Shujuan Zhang

doi:10.1117/12.2071017

18 November 2014 Volume-discharge formed in SF₆ and C₂H₆ mixtures without preionization

Ge Zhang, Changjun Ke, Shujuan Zhang

Proceedings Volume 9266, High-Power Lasers and Applications VII; 926618 (2014) https://doi.org/10.1117/12.2071017
Event: SPIE/COS Photonics Asia, 2014, Beijing, China

Abstract

A new approach to obtain glow discharge in working mixtures of non-chain HF laser has been brought forward. The most advantage of the approach is without pre-ionization, so the contamination of pre-ionization will not happen and the laser equipment is compact and simple. It is found, if the cathode surface is equally rough, we can obtain uniform volume-discharge in SF₆ mixtures without any pre-ionization, and dispense with uniform electric field electrode profile. The form of Self-Sustained Volume Discharge (SSVD) is a Self-Initiated Volume Discharge (SIVD). We show here the possibility of obtaining SIVD with a uniform energy deposition in a system of electrodes with non-uniform electric field. Experiments show that, with rough cathode and even anode, a volume discharge is forming in non-uniform electric-field without pre-ionization in SF₆ and C₂H₆ mixtures. At the beginning of the discharge, many diffuse channels attached to bright circular cathode spots, then, diverge towards the anode, with the channels overlapping, form a spatially uniform glow discharge. SIVD has been performed at a total mixture pressure up to 8kPa and energy deposition up to 200J/l. We also report measurements of the V-I characteristics of SIVD with SF₆ and C₂H₆ mixtures at pressure up to about 8kPa. The experimental results indicate that SSVD in SF₆ and C₂H₆ mixtures develops in the form of SIVD is promising for creation of high energy and pulse-periodic HF laser.

Citation Download Citation

Ge Zhang, Changjun Ke, and Shujuan Zhang "Volume-discharge formed in SF₆ and C₂H₆ mixtures without preionization", Proc. SPIE 9266, High-Power Lasers and Applications VII, 926618 (18 November 2014); https://doi.org/10.1117/12.2071017

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KEYWORDS

Electrodes

Hydrogen fluoride lasers

Contamination

Plasmas

Photography

Gas lasers

Ions

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