Pulsed UV and VUV Radiation Sources
Study and Creation of Pulsed UV and VUV Sources of Spontaneous Radiation with High Power Density
Tech Area / Field
- PHY-OPL/Optics and Lasers/Physics
8 Project completed
Senior Project Manager
Institute of General Physics named after A.M. Prokhorov RAS, Russia, Moscow
- Siberian Branch of RAS / Institute of High Current Electronics, Russia, Tomsk reg., Tomsk\nVNIIEF, Russia, N. Novgorod reg., Sarov
- University of Illinois At Urbana-Champaign, USA, IL, Urbana\nLos-Alamos National Laboratory, USA, NM, Los-Alamos\nNihon Koshuha Co., Ltd., Japan, Yokohama\nCNRS / Centre de Physique des Plasmas et de leurs Applications de Toulouse, France, Toulouse\nAlameda Applied Sciences Corporation, USA, CA, San Leandro
Project summaryThe proposed project is aimed at fulfillment of experimental studies and manufacture of laboratory pre-production models of the pulsed excimer sources of non-coherent UV and VUV radiation with high radiation power density, including the electrodeless specimens, for application in medicine, industry, agriculture, water supply, scientific studies, ecology and in private life. The Project is based on last achievements in research of new effective optical media, which do not contain mercury, and in creation of sources of the excitation providing high depositions of energy at increased pressure. The basic way of excitation of gas media, which will be used in work, is a self-sustained discharge in gases of the increased pressure. The given project as against previous ISTC projects 665 and 1270 is directed on creation of pulsed sources of spontaneous radiation with the high power density in UV and VUV ranges of spectrum and short duration of a pulse of radiation.
As pulsed sources of UV and VUV radiations the excilamps on the basis of mixtures of rare gases with halogens and on xenon at excitation by the self-sustained discharge, including electrodeless one, will be investigated. Besides will be studied xenon arc lamp with a spectrum close in UV range to Planck spectrum. All types of lamps do not contain mercury and are ecologically safe. From the analysis of results of known works follows that rather few attention was paid to development of UV and VUV sources with high density of pulsed radiation power. Correspondingly, the following problems demand their solving:
a) attainment of maximally high pulse density of radiation power;
b) attainment of maximal efficiency of conversion of electric energy into radiation at high power density;
c) creation of sealed-off models with long life-time at relatively high pulsed radiation power.
The following will be done within fulfillment of the project suggested:
1. Simulations and experimental investigations will be performed to study pumping conditions, as well as spectral and energy characteristics of UV and VUV radiation for the lamps of the following types:
- UV-preionized volume discharge pulsed excilamps and electrodeless discharge lamps based on mixtures of rare gases with halogens at increased pressures;
- Pulsed VUV excilamps based on xenon dimmers with transversal and longitudinal discharge;
- Arc UV lamps based on pulsed longitudinal discharge in preionized xenon at excitation from generators with solid-state switches.
2. The following parameters will be realized:
- efficiency of radiation transformation on xenon dimers of up to 40% (l ~ 172 nm);
- density of pulsed radiation power of up to 10 kW/cm2 for XeBr excilamp (l ~ 282 nm);
- density of pulsed radiation power of up to 60 kW/cm2 for arc xenon excilamps;
- density of pulsed radiation power of up to 200 W/cm2 and more in a pulsed repetition mode with long lifetime (222 nm, 282, and 308 nm).
3. The following sealed-off excilamps specimen will be created:
- a pulsed lamp on xenon dimers (172 nm) with pulsed repetition rate of up to 100 kHz, efficiency of up to 40%, and long period of lifetime;
- capacitive discharge excilamps (282 nm, 222 nm, 308 nm, and other) with power density of 100 W/cm2 and more, operating in a pulsed repetition mode with long period of lifetime (over 1000 hours).
4. Workability of the created specimen of pulsed sources of UV and VUV spontaneous radiation will be studied, including those ones operating with high pulse repetition rate and possessing a long lifetime period as thousand of hours, on their application in disinfecting of air, water, foodstuffs, etc., for cleaning of semiconductor surfaces, in lacquers and paints polymerization, in scientific research, and other.
The studies on transformation of the self-sustained discharge energy into UV and VUV pulsed radiation with high density of pulsed power and high efficiency are going on in close contact to the world community of researchers. The data obtained during studies are being approved at the International conferences and during personal meetings while visiting National laboratories in Russia and USA, as well as laboratories in France, Japan and Germany.
The scientific and engineering program and methods of investigations are based on the materials stated in scientific publications by Project executors and papers presented at International symposia.
Practical significance of the Project:
1. It provides to create a high efficient source of pulsed UV radiation available to be employed in industry, medicine, agriculture, water-supply systems, and in private life.
2. It gives an essential financial support to Russian researchers during Project fulfillment.
3. On Project completion, it allows to establish places of work for nuclear scientists in the fields of peaceful activities close to their profile.
The Project answers the purposes of the ISTC in the way that it allows for a group of Russian scientists having knowledge and professional skill in the field of nuclear weapons development to reorient themselves in work to civilian activities.