http://dspace.nbuv.gov.ua:80/handle/123456789/74817 2026-04-05T13:49:06Z http://dspace.nbuv.gov.ua:80/handle/123456789/79289 Measurements of evaporated aluminium concentration on self-absorbed spectral lines Lobko, A.K.; Trubchaninov, S.A.; Tsarenko, A.V. In the paper we discuss the experimental results of powerful plasma-stream interaction with aluminum target at the presence of the magnetic field. The plasma streams are generated by a quasi-stationary plasma accelerator (QSPA Kh- 50). Such experiments performed with QSPA facility during last years [1-3] are of great interest for current disruption simulation in ITER tokamak and testing divertor materials. Some experimental series in our activity were devoted to the problem of mass losses of target under the high power plasma stream irradiation. This work presents the spectral method of determination of the evaporated material quantities in plasma-target interaction experiments. The distinctive feature of the offered work is follows – all spectral measurements were carried out using aluminum spectral lines only. There are two mechanisms of mass losses – evaporation and splashing melt layer. We succeeded in the evaluation of the evaporation mechanism contribution to the mass defect for aluminum target. 2002-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/79288 TOF method in plasma potential measurements by HIBD Nedzelskiy, I.S.; Malaquias, A.; Gonçalves, B.; Varandas, C.A.F.; Cabral, J.A.C. The heavy ion beam diagnostic (HIBD) developed for the tokamak ISTTOK (R = 0.46 m, a = 0.085 m, B = 0.5 T, I = 6-9 kA) is based on a multiple cell array detector (MCAD), which collects simultaneously a “fan” of secondary ions originated along a primary beam trajectory in collisions with the plasma electrons and separated by the magnetic field of the tokamak. Utilization of the traditional electrostatic energy spectrographs for the plasma potential measurements in experiments with MCAD is very complicated. This paper presents the current results of adaptation and mastering of the alternative time-of-flight (TOF) technique. Three schemes of the measurements are considered: i) “integral” scheme of the average plasma potential measurements by a pulsed primary beam, ii) “quasi-local” scheme of the measurements of plasma potential drop between neighbouring sample volumes, and iii) “local” scheme of plasma potential profile measurements. The electronics used in TOF energy analyzer (TOFEA) consist of charge sensitive and fast shaping amplifiers, constant fraction discriminator and time-toamplitude converter with resolution ∆t/t = 10⁻⁴. The TOFEA resolution ∆t/t = 3×10⁻⁴ has been achieved in mastering experiments with a pulsed (250 ns) primary beam carried out to the primary detector in magnetic field of the tokamak. With plasma the resolution is reduced 2.5 times due to decreasing of signal-to-noise ratio caused by plasma loading of MCAD. The changes of the average plasma potential during discharges with minor disruptions have been obtained by TOF energy analysis. The results of this experiment allow to conclude the reliability of TOF technique in plasma potential measurements by HIBD with MCAD. On the base of the obtained data and experience a four-channel TOFEA for the plasma potential profile measurements has been elaborated. 2002-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/79287 Investigation of plate-type barrier ozonizers with ac and pulse power supplies Krasnji, V.V.; Gubarev, S.P.; Kotsubanov, V.D.; Pogoghev, D.P.; Sokolova, O.T.; Taran, V.S.; Tereshin, V.I.; Shvets, O.M. In this paper the experimental results on the investigation of plate-type reactors operated on the base of barrier discharge have been presented. Different reactors with planar, strip, and trench electrodes were investigated. Such reactors operated under atmospheric pressure with ac and pulse power sources with voltage of up to 10 kV, frequency up to 12 kHz. Using atomized spectroscopy system the measurements of the main specifications of the reactors such as ozone yielding rate, the temperature in the reactor and the air flow rate were carried out. 2002-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/79286 Large-area surface wave plasma source Azarenkov, N.A.; Bizyukov, A.A.; Sereda, K.N.; Tseluyko, A.Ph.; Yunakov, N.N.; Gapon, A.V.; Kashaba, A.Y. A surface wave plasma source for the production of a large-diameter, high electron density and low electron temperature plasma at low pressure without using a magnetic field for plasma processing and thin film preparation are. The DC or RF voltage with the frequency of 13.56 MHz can supply the source. The pumping-out of the source is carried out through the insulated substrate holder. The plasma source operates in a working gas pressure range of 3∙10⁻² ÷ 10⁻⁴ Torr with changing the RF power in a range of 50÷1000 W during the discharge on surface waves with the mode 0 excited by a ring antenna. The plasma density has a homogeneous distribution over a diameter of 300 mm and varies in a range of 10⁸÷10¹⁰ cm⁻³ at electron temperature of 2÷7 eV depending on external parameters. An ion beam density in the presence of the RF bias applied to the substrate holder reached 0.1 mA/сm² with homogeneous distribution over the diameter of 300 mm. The total ion current to the substrate holder with a diameter of 467 mm reaches the value of 2 A with average ion energy of 200 eV. Numerical analysis of electric field distribution over the processing chamber in linear approach was made and compared to experimental results obtained. 2002-01-01T00:00:00Z