The influence of gaseous nitrogen on the discharge behavior in liquid nitrogen is investigated in this work. The experiments were conducted in pressurized liquid nitrogen with an ambient pressure of 3 and 5 barabs. Rogowski-shaped electrodes were used to guarantee a homogeneous field. The bubbles were created on the lower electrode with a resistive heater. In order to identify the discharge behavior, the setup was stressed with lightning surge and ac voltage at electrode gaps up to 5 mm. The measurement results were compared with calculations of the discharge field strength in the bubble with Paschens law. For these calculations, a fictive pressure is introduced to take the higher density of the gas caused by the cryogenic temperature into account.
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Blaz et al. (2013) studied this question.
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