Simulation of Hydrogen Isotopes Accumulation Processes in Materials in the Presence of Chemical Traps

The accumulation of hydrogen inside a solids occurs in traps of a different nature. The following things are known in addition to finding hydrogen in interstitial sites: dislocation mechanisms of hydrogen storage, micropores and microcracks, sorption on the free surface of microdefects, chemical traps with the formation of hydrides and other compounds, both with matrix material and with impurities or components of alloys. It is established that each type of trap has its own binding energy of hydrogen, which can vary from 0.2 eV for hydrogen gas in microdefects to several eV for hydrogen chemically bound in traps. Measurements of the distribution of hydrogen concentration dissolved in a solid body over binding energies provide a clue as to the understanding of hydrogen impact on mechanical properties and to the development of technologies for controlling the materials properties during their production and operation. The paper presents the results of simulation experiments on hydrogen saturation of materials in the presence of chemical traps. The proposed model, based on the numerical solution of the diffusion equation in the presence of irreversible capture, made it possible to describe the absorption process and determine the activation energies of hydrogen interaction with the material

Studies on gas release from pre-saturated samples on a plasma beam installation

We conducted methodological studies to evaluate the possibility of conducting experiments on gas release from pre-saturated samples on a plasma-beam installation. One of the tasks of obtaining reliable data on the parameters of the interaction of hydrogen isotope ions with materials of the NNR is to conduct methodically correct post-test experiments on the study of gas release from the investigated samples subjected to ion irradiation. The paper presents three stages of research. In the first stage, experiments were con-ducted on saturation and gas release with the sample from tungsten. At the second stage, experiments were performed with a tungsten sample on saturation with its deuterium and degassing under stepwise heating conditions. At the third stage, experiments were conducted on gas release with vanadium samples, with maximum sensitivity for dissolved gas in the sample. The results of calculations of the temperature field on the sample are presented. It is shown that, on the whole, it reflects the experimentally observed effect on a significant sample temperature gradient

Study of processes of nuclear reaction energy conversion into energy of optical radiation

Abstract This paper presents the preliminary results of the reactor experiments to study the spectral-luminescent properties of gaseous mixtures (based on He, Ne and Kr noble gases). The investigated gaseous mixtures were excited by the products of 6Li(n,α)3H nuclear reaction. The IVG.1M research reactor acted as a source of thermal neutrons. The description of experimental facility and experimental ampoule device for reactor irradiation is presented. The highest intensity of radiation was observed in experiments with He-Ne gaseous mixture on lines with a wavelength of 585.2 nm, 640.4 nm and 703.4 nm. He-Ne mixture’s main energy in the range of 500 nm to 800 nm was radiated on atomic transitions 3p-3s of neon. The most intensive transitions in neon were 3p’[1/2]0 - 3s’[1/2]10 with λ = 585 nm and 3p[1/2]1 - 3s’[1/2]20 and 3s[3/2]10 with λ = 703.4 nm and 724 nm