Detection of microparticles in dynamic processes

31st International Conference on Equations of State for Matter

Ten, K.A.^1,2 ; Pruuel, E.R.^1 ; Kashkarov, A.O.^1,4 ; Rubtsov, I.A.^1,4 ; Shechtman, L.I.^2,4 ; Zhulanov, V.V.^2,4 ; Tolochko, B.P.^2,3 ; Rykovanov, G.N.^5 ; Muzyrya, A.K.^5 ; Smirnov, E.B.^5 ; Stolbikov, M Yu^5 ; Prosvirnin, K.M.^5

Lavrentyev Institute of Hydrodynamics, Siberian Branch, Russian Academy of Sciences, Lavrentyev Avenue 15, Novosibirsk

630090, Russia^1

Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, Lavrentyev Avenue 11, Novosibirsk

630090, Russia^2

Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, Kutateladze 18, Novosibirsk

630128, Russia^3

Novosibirsk State University, Pirogova Street 2, Novosibirsk

630090, Russia^4

Federal State Unitary Enterprise, Russian Federal Nuclear Center, Academician Zababakhin All-Russian Research Institute of Technical Physics, Vasilieva 13, Snezhinsk, Chelyabinsk Region

456770, Russia^5

关键词: Accelerator complex;    Density distributions;    Flow of particles;    High speed detectors;    Optical technique;    Particle size ranges;    Piezoelectric sensors;    Soft x-ray spectrums;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/774/1/012070/pdf
DOI  :  10.1088/1742-6596/774/1/012070

来源: IOP

【 摘 要 】

When a metal plate is subjected to a strong shock impact, its free surface emits a flow of particles of different sizes (shock-wave "dusting"). Traditionally, the process of dusting is investigated by the methods of pulsed x-ray or piezoelectric sensor or via an optical technique. The particle size ranges from a few microns to hundreds of microns. The flow is assumed to include also finer particles, which cannot be detected with the existing methods yet. On the accelerator complex VEPP-3-VEPP-4 at the BINP there are two experiment stations for research on fast processes, including explosion ones. The stations enable measurement of both passed radiation (absorption) and small-angle x-ray scattering on synchrotron radiation (SR). Radiation is detected with a precision high-speed detector DIMEX. The detector has an internal memory of 32 frames, which enables recording of the dynamics of the process (shooting of movies) with intervals of 250 ns to 2 μs. Flows of nano- and microparticles from free surfaces of various materials (copper and tin) have been examined. Microparticle flows were emitted from grooves of 50-200 μs in size and joints (gaps) between metal parts. With the soft x-ray spectrum of SR one can explore the dynamics of a single microjet of micron size. The dynamics of density distribution along micro jets were determined. Under a shock wave (∼ 60 GPa) acting on tin disks, flows of microparticles from a smooth surface were recorded.