Flashlamp voltage and light-pulse shifts caused by gas heating

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Abstract
The gas temperature in a flashlamp is noticeably asymmetric, higher in the second half of the current pulse than in the first. This asymmetry shifts the maxima in lamp voltage and electron temperature from the lamp current peak. Because of the asymmetric gas heating, the voltage maximum preceeds the current peak while the electron temperature lags behind the current. Since the light emission is determined mainly by the electron temperature, a shift of the light peak occurs so that the light peak lags the current peak. A theoretical description of these shifts is presented. Under the assumptions that the current I = K0V1/2, and the gas temperature, power, and current shapes are similar near the maxima, the voltage and light shifts τ have the same magnitude and are given by τ/Δ = 0.136, where Δ is the one-sided current halfwidth. Experiments verified the direction and the approximate magnitudes of the shifts due to gas heating.

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