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The effect of varied concentrations of deuterium-krypton (D2–Kr) admixture on the neutron emission of a fast miniature plasma focus device was investigated. It was found that a judicious concentration of Kr in D2 can significantly enhance the neutron yield. The maximum average neutron yield of (1±0.27)×104 n/shot for pure D2 filling at 3 mbars was enhanced to (3.14±0.4)×105 n/shot with D2+2% Kr admixture operation, which represents a >30-fold increase. More than an order of magnitude enhancement in the average neutron yield was observed over the broader operating range of 1–4 mbars for D2+2% Kr and D2+5% Kr admixtures. [ABSTRACT FROM AUTHOR]

In a 200 J fast miniature plasma focus device about 17- and 10-fold increase in x-ray yield in spectral ranges of 0.9–1.6 keV and 3.2–7.7 keV, respectively, have been obtained with deuterium-krypton (D2–Kr) admixture at operating pressures of ≤0.4 mbar. In the pressure range of >0.4–1.4 mbar, about twofold magnification in average x-ray yield along with broadening of optimum pressure range in both spectral ranges were obtained for D2–Kr admixtures. An order of magnitude enhancement in x-ray yields at low pressures for admixture operation will help in achieving high performance device efficiency for lithography and micromachining applications [ABSTRACT FROM AUTHOR]

Titanium thin film was prepared on copper substrate by thermal evaporation method. Gettering property of titanium film for deuterium was studied for different values of temperature, pressure and time. The studies were carried out in an ultra high vacuum system. The substrate was mounted in the vacuum system on a heater whose temperature was controlled by PID controller. The titanium thin film was activated for 1 h at a temperature of 500 °C under vacuum. After activation, during cool down, the vacuum chamber was pressurized at various pressure values of deuterium and left for absorption for various time periods. Comparative studies of the amount of deuterium desorption for various charging pressure and exposure time were studied with the help of residual gas analyzer. Attempts were made to qualify the process of deuteration of the titanium film. The results of these studies are presented in this article. • Comparative study of deuteriated titanium thin film performed by RGA. • RGA spectrum reveals about surface limited and diffusion limited desorption. • Effect of charging pressure & duration on bulk concentration of deuterium studied. • Achievement of higher bulk concentration could be established through this study. [ABSTRACT FROM AUTHOR]

Zirconium based alloys are proved to be a good material for hydrogen storage as well as a vacuum pump. A non evaporable getter pump based on St 172 was tested for deuterium storage capacity in a sealed off vacuum device. The vacuum in the range of ultra high vacuum was maintained by the getter pump by gettering. Initial vacuum was created by a turbo molecular pumping system. After activation of the getter, test chamber was charged at 1 bar and 3 bar deuterium pressure for 24 h in two different experimental campaigns. After charging with deuterium, the chamber was pumped to ultimate vacuum and isolated from the TMP. The partial pressure of deuterium for different temperature of the getter was measured in sealed condition. Higher charging pressure improves the partial pressure of deuterium during desorption cycle. The experimental details and the results are presented in this article. • St 172 NEG was tested for use as deuterium source in sealed off vacuum device. • Higher charging of deuterium is effective to get higher operational pressure. • Higher charging helps for low temperature operation for specific deuterium pressure. [ABSTRACT FROM AUTHOR]