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Control of SF 6 discharge gap switch by XeCl excimer laser
Author(s) -
Okuda Hisato,
Katayama Kazuhisa,
Wang Xiaojun,
Masugata Katsumi,
Yatsui Kiyoshi
Publication year - 1991
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391110406
Subject(s) - materials science , laser , excimer laser , torr , excimer , jitter , electrode , voltage , irradiation , breakdown voltage , optics , wavelength , plasma , absorption (acoustics) , optoelectronics , chemistry , electrical engineering , physics , nuclear physics , composite material , thermodynamics , engineering , quantum mechanics
Experimental studies have been carried out on triggering characteristics of the SF 6 discharge gap switch by use of XeCl excimer laser (wavelength = 308 nm). First, laser irradiation characteristics are studied on a pure SF 6 in the pressure range of p = 160 ∼ 3,800 torr. Using a lens of f (focal length) = 133 mm, the laser is irradiated into the gas, where the energy absorption is studied. If the laser is injected into the gas with the energy above a certain threshold for the breakdown, the rate of energy absorption is found to be ∼ 17 percent of the incident energy at p > 760 torr. Injecting the laser into the SF 6 ‐filled gap switch (gap length = 7 mm, p = 760 torr), we have studied the triggering characteristics. Excellent triggering characteristics were obtained; delay time for the discharge ∼ 20 ns, and the jitter ∼ 260 ps when the gap voltage is operated at 99 percent of the self‐breakdown voltage. In addition, the triggering characteristics are studied by changing the focusing point axially. It is found that both the delay time and the jitter decrease when the focusing point tends to approach the high‐voltage electrodes.