Ultraviolet Output from Pulsed Short Arcs.
NAVAL RESEARCH LAB WASHINGTON D C
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A pulsed ultraviolet source consisting of microsecond, kiloampere discharges across a millimeter gap in the noble gases was investigated. The optical output was monitored in the 1800 - 3000 A region. It was found that maximum time-integrated output was achieved with xenon, but that duration as well as amplitude increased in the He-Xe sequence. The output saturated with pressure at about 5 atm in all the gases. A 200 nsec current pulse was almost three times as efficient as a 700 nsec pulse, because the UV output is associated with high current density in a narrow initial arc channel, and the longer pulse allows more time for radial expansion. The UV reduction and amplitude jitter reduction due to a dc keep-alive current were also investigated. Author
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