A Gas-Discharge Emitter with Restriction of the Distribution of the Discharge for the Registration of Fast Processes and
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RAL EXPERIMENTAL TECHNIQUES
A Gas-Discharge Emitter with Restriction of the Distribution of the Discharge for the Registration of Fast Processes and the Initiation of Photosensitive Energy-Saturated Materials S. I. Gerasimova,b,c, d,*, V. I. Erofeevc, d, V. A. Kikeevc, d, V. A. Kuzmina,b,d, K. V. Totyshevb, E. G. Kosyaka, P. G. Kuznetsova, and R. V. Gerasimovaa a
Sarov Institute of Physics and Technology, Branch of National Research Nuclear University MEPhI, Sarov, Nizhny Novgorod oblast, 607186 Russia b Russian Federal Nuclear Center, All-Russian Research Institute of Experimental Physics, Sarov, Nizhny Novgorod oblast, 607190 Russia c Nizhny Novgorod State Technical University, Nizhny Novgorod, 603950 Russia d Institute for Mechanical Engineering Problems, Russian Academy of Sciences, Nizhny Novgorod, 603024 Russia *e-mail: [email protected] Received January 31, 2020; revised March 12, 2020; accepted March 13, 2020
Abstract—This paper describes the design of a gas-discharge emitter, which is implemented by limiting the spread of the discharge in a narrow gap between two transparent equidistant surfaces, with air as the working gas with a peak brightness of 6.2 Msb, a luminous body of 18 cm2 (at a discharge energy of 75 J), and a halfwidth duration of ~2 μs. This scheme can be used to solve a wide class of problems, for example, those related to photogrammetric measurements in aeroballistic tests, as well as when creating pulsed loads when detonation is initiated in an extended layer of a photosensitive energy-saturated material. DOI: 10.1134/S0020441220040260
Various designs of light sources with a fixed position of the emitter are used in the practice of shadow methods with optical imaging. In addition to standard capillary spark gaps, a circuit with a spark discharge between transparent plates is known [1]. A light source such as a flash lamp where the optical axis is not directed parallel to the plates but perpendicular to them makes it possible to use an intense flat emitter, which is more effective than standard pulsed quartz tube lamps for photography for a number of applications [2]. One feature of this design is that the optimal lighting parameters of the emitter are easily selected by changing the geometry for the parameters of a given energy storage, which is impossible when using a lamp with an unchanged shape. In contrast to the characteristic illumination pulse created by the lamp, with a relatively long decline, the presence of a gap between the plates makes it possible to obtain a sharp decrease in the light pulse after the cessation of current growth. For comparison, Fig. 1 shows the signals from a silicon photosensor in relative units that register the illumination pulses generated by a standard IFK500
xenon lamp (curve 1) and flat emitter (curve 2) in the linear region when using a drive with a discharge energy of 75 J and an operating voltage of 30 kV. The difference in the amplitudes is explained by the significant difference in the radiation area. For IFK500, the shape of the luminous
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