Diagnostic a microwave plasma jet system for laboratory applications

This research aims to develop and diagnostic the microwave plasma jet system for laboratory applications. Microwave-induced plasma jet (MIPJ) system has been construction utilizing inexpensive materials. The (MIPJ) system includes a magnetron microwave generator operating at 2.45 GHz coupled to a waveguide (Panasonic-2M210) type with a field applicator of type WR-284, Waveguide of rectangular shape (WR-284) was tapered to 72 mm×5 mm on one side, to intensify the electric field to approximately 2.6 times. A discharge tube made of quartz of (2, 6 and 10) mm inner diameter and thickness of 1mm. was inserted perpendicularly to the wide wall of the waveguide and served as a discharge tube. It is valuable to understand the controlling factors of the plasma jet length. the jet length has been performed through examining the influence of the flow rate feed gas, which varying from (2.5-10) L/min. the voltage supply to the magnetron which varying from(160 -200)V and the discharge tube diameter which varying from (2-10)mm. The length of the jet was measured using an index ruler and Samsung mobile camera. The working gas temperature measured with remote infrared thermopile. The optical emissions spectrum of the MIPJ was measured using an SUWRIT-S3000 spectrometer this spectrometer was connected to a fiber optic (F600-Y-UV-SR-NIR). The spectrum graph was examined using the Spectra (V 3.3) program. From the results the longest length of the plasma jet was 5.9 mm, and it can be controlled through the gas flow rate, the supplied voltage, and the diameter of the discharge tube. The highest temperature of argon gas was 62 °C and the lowest was close to room temperature. The emission spectrum contains many peaks belonging to Ar, N and O in the form of excited neutral atoms and ionized to high degrees. From this we conclude the possibility of developing MIPJ suitable for laboratory research in the fields of medicine and biology.