The results of investigations of dielectric barrier discharges parameters and UV-emission of Xe/SF<sub>6</sub> (50:1) mixture related to the pressure and the distance between electrodes are presented. The basic source of UV-emission in Xe/SF<sub>6</sub> mixture is XeF<sup>*</sup> excimer, whose emission band center is positioned at 354 nm. The mixture pressure was varied in the range from 40 to 180 Torr, and the distance between electrodes changed in range from 3 to 11 mm. The distance between the electrodes and the gas pressure were selected out so that <i>pd</i>-product should be constant. The experiments conducted display that for <i>pd = const</i> in the pressure range of 70-180 Torr there are some regularities which are partly similar to the scaling laws of gas discharge, namely: the current density ~ <i>const</i>; the power dissipated by the discharge ~ 1/<i>p</i><sup>0.3</sup>; UV emission power ~ 1/<i>p</i>; the efficiency of lamp ~ 1/<i>p</i><sup>0.8</sup>; the current pulse duration ~ 1/<i>p</i><sup>0.3</sup>. The highest efficiency (6-8%) was reached for 30-50 Torr gas pressure.
The review of the investigations of the optical radiation forming of the multi-channel nuclear-pumped lasers performed
in VNIIEF is presented. There are several ways to solve the problem of the laser beam number minimization: 1) the using of the generator -amplifier scheme; 2) the phasing of the radiation of several lasers channels by means of the optical coupling devices; 3) the using of consecutive and parallel composition of the laser channels. At present, in VNIIEF the investigations of the generator -amplifier scheme and the laser systems consisted of two, three and four
consecutive composed channels have been performed experimentally. Moreover, investigations of parallel composition of two laser channels are in progress now. There are three nuclear-pumped laser systems which were used to investigate the composition methods: LM-4, LM-8 and LUNA-2M, moreover, except the LM-4 these multi-channel systems are being used for carrying out the experiments nowadays.
The various dielectric barrier discharges (DBD) lamps and plasma panel prototype designs developed in VNIIEF are presented. The lamps given, depending on a configuration of electrodes, it is possible to divide into three types: 1) a lamp with a plane-parallel configuration of the electrodes, intended for researching of barrier discharges parameters and UV-radiation of various mixes. The design of this lamp allows changing electrodes and varying distance between them; 2) lamps of cylindrical geometry. The external electrode is a spiral or a grid, and internal electrode is a metallic foil. Such design of lamps is the most widespread; 3) lamps with a planar configuration of electrodes. There are two types of lamps with a planar configuration of electrodes: 1) plasma panel prototypes and 2) lamps with ceramic barriers. Plasma panel prototypes are increased (in 50-100 times) copies of plasma display panels (PDP) and are intended for researching of the processes taking place in PDP. Using ceramic barriers of high capacity in DBD lamps allows receiving bigger power density of UV-radiation, than in case of glass (quartz) barriers.