engleski

Study of cold plasma jets in different ambiental gases

Atmospheric pressure plasma jets (APPJs) are being developed for various applications in plasma medicine, plasma agriculture, biotechnologies and for materials modifi cations [1]. Specifi c applications are made possible by tailoring plasma sources and choosing operating parameters. Some of those parameters are voltage shape/amplitude/duration/rise time. For example, when the pulse width is short enough (few hundred ns), increasing the pulse width leads to higher discharge currents and longer plasma jets. Another parameter important for application is the ambiental pressure. Here we are interested in a transition from a typical atmospheric pressure plasma jet to a diff use plasma at the low pressure. The transition is made possible by inserting a capillary plasma source into a glass tube (11.5 cm diameter, 150 cm length) that is connected to a rotary vacuum pump and vacuum gauge. The APPJ electrode was a copper wire with a diameter of 0.1 mm inserted in a 70 mm long and 1.5 mm outer diameter borosilicate glass capillary tube [2]. Both working gas and background gas were controlled with the mass fl ow controllers in the range of several L/min. Input voltage was either sinusoidal (about 25 kHz, 2.5 kV) or rectangular (with short rising time). Plasma diagnostics was performed using imaging accompanied with the optical emission spectroscopy, along with determination of voltage-current curves, with respect to the total pressure and mass fl ow in the tube, for diff erent gas combinations. [1] A. Režek Jambrak, T. Vukušić, V. Stulić, J. Mrvčić, S. Milošević, M. Šimunek, Z. Herceg, Food Bioprocess Technol., 8 (2015), 791-800. [2] R. Zaplotnik, Z. Kregar, M. Bišćan, A.Vesel, U. Cvelbar, M. Mozetič, S. Milošević, EPL, 106 (2014), 25001.

Atmospheric pressure plasma jets ; gas effect

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