The work is devoted to experimental determination of cylindrical hollow cathode length influence on discharge volt-ampere characteristic in argon at 8*10-2 torr pressure. Hollow cathode consists of stainless steel net cylinder with brass moving isolated electrode (collector) inside. Cathode-anode range is constant. Cathode diameter is 34 mm, cave length L is varied between 0 and 15.5 cm. Discharge volt-ampere characteristics at several cathode lengths are obtained. It is founded, that collector current dependence on L has maximum at cathode-length diameter ratio of 2-3 at voltage between electrodes of 520 V. Theoretical volt-ampere characteristic calculation, which considerates fast cathode layer electron ionization, is given. Experimental dependence of maximal cathode length coincides with theory at secondary ion-electron emission coefficient g of 0.01. Qualitative explanation of obtained results is presented.

Hydrogen -oxygen flame production by water hydrolysis and examination of its consistention by spectral method. [A.A. Sametova, M.A. Yurkin]

Theoretical principles of water hydrolysis and elements of hydrogen combustion theory are presented. Certain hydrogen-oxygen combustion product spectra are given. Experimental installation which generates hydrogen-oxygen mixture is created and described in detail. For safe working with flame two hydrolocks are used. At 18 V voltage and 7 A electrolyte current installation productivity is 7cm3/sec. Hydrogen-oxygen flame spectrum is obtained using UM-2 monochromator and plotter at wavelength range from 4000 to 7500 A. Flame combustion unstability, which is measured at fixed rotation-oscillation spectral line intensity peak is observed. Unstability is about 10% from peak maximum and fluctuates in time. It is founded from analysis of obtained spectrum, that NO2, H2O and atomic H molecules present in flame. It coincides with certain experimental data. The work is directed to following flame characteristic researches and devoted to molecular physics, chemical physics , electrochemistry and optics.

An examination of electrophysical gas properties and Paschen dependence for argon and helium. [M.Zhambalov, I.Kochetkov]

Breakdown voltage dependence on pressure (0.07-0.3 torr) and range between 34 mm flat brass electrodes for argon and helium in glass tube at constant gas flow to discharge region is examined. Breakdown voltage is determined by sharp ampermeter current growth. It is shown, that voltage region between 320 and 340 V corresponds breakdown voltage minimum at P*d range from 1 to 5 mm*torr. Absolute pressure measurement error is less than 15%, absolute interelectrode range measurement error is less than 10%, which gives P*d measurement error less than 25%. Obtained Paschen dependencies for argon coincide with certain literature data (Howatson, Reiser). For helium there is discrepancy in data. We suppose, that it is connected with atmosphere gas impurity due to gas diffusion in discharge chamber. The work is devoted to gas discharge and ion beam physics and plasma technologies.

End -hole ion source. [V.Yu. Ladygin, N.A. Nianchuk-Tatarsky]

Characteristics of low-energy (up to 100 eV) end-hole ion source with refrigerated magnet system outside the vacuum chamber are examined. Beam current density is 58 mA/cm2 at 5*10-4 torr pressure (argon is used) and 5,5 cm range from source. Source work mode with strong magnetic field accompanying the beam is examined, i.e. space distribution of beam current density as a function of accompanying magnetic field at given magnet system configuration. It is founded, that axial distribution of current density has sharp maximum j=57 mA/cm2 (at 10 cm source distance and 5*10-4 torr pressure), magnetic field in focusing region is 160 oersted. An estimation of flow velocity influence on beam characteristics is also made. Examined source is proposed to use for thin film synthesis.