The total time-lag τ necessary for building up strong continuous spectral emission after a flash tube is triggered consists of the time-lag τ
i in the discharge current and the delay-time τ
l in the light emission after the discharge is started, that is, τ=τ
i+τ
l. Both the values of τ
i and τ
l increase with increase of the gas pressure
p and the electrode distance
d, and decrease with the increase of the voltage
V applied to the main electrodes.
In this study, the value of τ
i and its fluctuation have been determined by varying the triggering intensity for flash tubes filled with various rare gases. It is made clear that τ
i tends to approach a certain definite value characterized by
p,
d,
V and the nature of gas and that the fluctuations become smaller with the increase of the triggering intensity. When a flash tube is used as the light source in high-speed photography, it is pointed out that the triggering intensity should be chosen correctly according to the discharge conditions such as
p,
d,
V and the nature of gas.
The experimental results of τ
i have been analyzed qualitatively on the assumption that the discharge in a flash tube may be looked upon as a simple Townsend discharge.
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