Evaporation and thermal stresses in molybdenum irradiated by electrons
Journal Title: Eurasian journal of physics and functional materials - Year 2018, Vol 2, Issue 2
Abstract
Plasma disruption in the thermonuclear facility leads to a release of large energy flows to the chamber wall. The pulse duration is 10-6 -10-4 s, energy fluxes are of the order of 108 -1011 Wm-2 . High temperature of the protective coating surface causes its evaporation and, probably, destruction under the action of thermal stresses. A promising material for the first wall protection is, in particular, molybdenum. In order to check suitability of molybdenum as a protective coating, an experiment on irradiation of a molybdenum sample with electrons (parallelepiped - 2x10x0.3 mm) was carried out. The energy flux was J =4x1011 W m-2 ; pulse duration t = 2 ms . The weight loss of the sample was 2.1 mg; cracking of the trained surface was observed. The purpose of this analysis is to calculate the temperature fields to estimate the mass of evaporated molybdenum and to determine critical thermal stresses.
Authors and Affiliations
G. Z. Ganeev, S. B. Kislitsin
Keywords
Related Articles
- EP ID EP305085
- DOI 10.29317/ejpfm.2018020208
- Views 92
- Downloads 0
Spectroscopy of transfermium elements at Dubna: results and plans
During the last 12 years using the GABRIELA (Gamma Alpha Beta Recoil Invetsigations with the ELectromagnetic Analyser) detector set-up and kinematic recoil separators VASSILISSA / SHELS the experiments aimed to the gamma...
Analysis of (11Li+9Be)-reaction in the framework of the time-dependent Schrodinger equation
Neutron transfer and nucleus breakup cross sections in (11Li+9Be)-reaction are calculated at energy range up to 32 MeV/nucleon. The evolution of probability density of external weakly bound neutrons of 11Li and the proba...
Investigation of the stability of nanostructures to degradation
The paper presents the dependence of the degradation degree in various aggressive media and time in a medium. The greatest deterioration in crystallographic characteristics of nanostructures in corrosive media is observe...
Neutron flux distribution in (Pb, Ta and W) target using accelerator of 18 MeV electron beam
The production of neutrons can be carried out with the bombardment of the nuclei of heavy atoms, with accelerated and energetic particles (generally electrons). The electron collides with the target nuclei, so, 20 to 30...
A brief review of conductivity and thermal expansion of perovskite-related oxides for SOFC cathode
Cathode materials with mixed ion-electron conductivity (MIEC) are necessary for the development of low or intermediate temperature solid oxide fuel cells. Perovskite and perovskite-related materials are promising candida...