Characteristics of Radiation of High-Pressure Short-Arc Xenon Gas-Discharge Lamp

The paper is devoted to the study of changes in characteristics of ultra-high pressure short-arc xenon lamps when a tungsten layer is sprayed onto the quartz shell, as a result of heating and local electrode erosion. The paper analyzes the mechanisms of phenomena occurring in the super-high pressure xenon discharge and the cathode spot, which affect the sputtering of the electrode material. The main negative effects of tungsten deposits appearing on the lamp shell inner surface are considered: a decrease in the optical transparency and mechanical strength of quartz glass, an increase of the bulb temperature, a change in spectral characteristics and spatial distribution of radiation of a gas-discharge lamp. The original method developed for studying the parameters of radiation of a gas-discharge lamp and based on the superposition of the optical axis of the photometer with the axis of the lamp passing through the cathode spot and the considered shell segment, transparent or sprayed, allowed us to compare radiation characteristics of the lamp without changing the plasma parameters. The thermodynamic analysis carried out within the research confirmed the absence of chemical interaction of tungsten layer with quartz glass. Spectral distribution of xenon discharge radiation in the visible and IR ranges is different for a transparent bulb and the bulb with a tungsten spot, which is due to the size of tungsten layer particles on the lamp bulb. A study of spatial distribution of radiation from a gas-discharge lamp showed a decrease in the intensity of radiation in a solid angle bounded by a tungsten spot. At the same time, in this region, there was observed an increase in the temperature of the quartz shell, leading to the appearance of a longitudinal gradient of the temperature field of the gas-discharge lamp

References

[1] Vartanyan A.A., Kovalevskiy V.E., Torgonenko V.A. Lighters with short arc lamps for. Svetotekhnika [Lights & Engeneerings], 1986, no. 6, pp. 15--17 (in Russ.).

[2] Kamrukov A.S., Kireev S.G., Kozlov N.P., et al. Energy and emission characteristics of a short-arc xenon flash lamp under "saturated" optical brightness conditions. J. Appl. Spectros., 2017, vol. 84, no. 4, pp. 657--663. DOI: 10.1007/s10812-017-0525-0

[3] Basov Yu.G., Rakviashvili A.G., Sysun V.V. Spetsial’naya svetotekhnika [Special lightning engineering]. Minsk, BGU Publ., 2008.

[4] Kaptsov N.A., Goukhberg D.A. Super high pressure lamps. UFN, 1951, vol. 43, no. 4, pp. 620--662 (in Russ.). DOI: 10.3367/UFNr.0043.195104f.0620

[5] Rokhlin G.N. Razryadnye istochniki sveta [Discharge light sources]. Moscow, Energoatomizdat Publ., 1991.

[6] Zakaryan A.S., Rabinovich G.I. Measurement of cathode erosion in xenon lamp. Svetotekhnika [Lights & Engeneerings], 1986, no. 4, pp. 15--16 (in Russ.).

[7] Rabinovich G.I. Thorium evaporation rate from cathodes of xenon ultrahigh pressure lamps. Svetotekhnika [Lights & Engeneerings], 1980, no. 9, pp. 11--13 (in Russ.).

[8] Amosov V.M., Karelin B.A., Kubyshkin V.V. Elektrodnye materialy na osnove tugoplavkikh metallov [Electrode materials based on refractory metals]. Moscow, Metallurgiya Publ., 1976.

[9] Finkel’nburg V., Mekker G. Elektricheskie dugi i termicheskaya plazma [Electric arcs and thermal plasma]. Moscow, IIL Publ., 1961.

[10] Gavrish S.V., Loginov V.V., Puchnina S.V., et al. Study of temperature fields in discharge sources of IR radiation with sapphire envelope. OKNTPR, 2014, no. 1, pp. 49--55 (in Russ.).

[11] Samsonov G.V., ed. Fiziko-khimicheskie svoystva okislov [Physical and chemical properties of oxides]. Moscow, Metallurgiya Publ., 1978.

[12] Matskevich N.I., Semenova Z.I. Phase transformations in the system Cr--Si--W--O. J. Alloys Compd., 2011, vol. 509, no. 21, pp. 6146--6151. DOI: 10.1016/j.jallcom.2011.03.024

[13] Wang H., Chen Y., Bai Z., et al. Phase relations in the Ta₂O₅---WO₃---SiO₂ system. Int. J. Refract. Metals Hard Mater., 2017, vol. 64, pp. 47--51. DOI: 10.1016/j.ijrmhm.2017.01.004

[14] Kholodilov V.I. Radiation distribution of short arc xenon lamps. Svetotekhnika [Lights & Engeneerings], 1973, no. 8, pp. 17--18 (in Russ.).

[15] Rychkov V.I., Sokolov L.S. Characteristics of ball xenon lamps in terms of the formation and calculation of the light beam. Svetotekhnika [Lights & Engeneerings], 1968, no. 6, pp. 11--13 (in Russ.).