Abstract
In this paper we present volt-ampere-power characteristics of a plasma needle operating in the flow of helium at the atmospheric pressure. Also, we will present discharge images obtained by using ICCD camera. In addition, we show some examples of how such plasma affects plant tissues. In characterization of the plasma needle, current and voltage waveforms were recorded by two derivative probes. These two probes are similar to the probes previously used in measuring transmitted power in low pressure CCP rf discharge [1]. The instantaneous power was calculated from current and voltage waveforms and U-I characteristics of the discharge were determined. Regimes of operation with and without the grounding ring at the tip of the needle were considered. We have chosen two model systems to study the effect of plasma needle on plant cells and tissues: sweet fern gametophyte (prothallus) and calli produced in vitro.
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