Speaker
Dr
Dmitriy Skovorodin
(Budker INP SB RAS)
Description
Performance of flash radiography units implies a high spatial resolution. Thus, focused electron beams are utilized to produce bremsstrahlung x-ray at the solid target. It results in the strong heating of the target up to 1-10 eV temperature and formation of dense plasma. The plasma expands into vacuum after the pulse of electron beam. In case of multi-pulse operation mode of radiography unit the plasma produced by the first pulse can strongly affect subsequent pulses. The interaction of electron beam with plasma cloud strongly depends on its electron density. Although the plasma is highly ionized at first moment it cools down adiabatically during expansion. Thus the plasma should recombine rapidly according to Saha equation. However the recombination rate decreases because of plasma expansion and the degree of ionization could be frozen. In present work we utilize the model of Zeldovich and Raizer to estimate the electron density in the target plasma. The typical parameters of radiography units based on linear induction accelerators is considered. It is shown that electron density in plasma expanding after first pulse is high enough to affect subsequent electron beams.
Primary author
Dr
Dmitriy Skovorodin
(Budker INP SB RAS)
Co-authors
Prof.
Aleksandr Burdakov
(Budker INP SB RAS)
Dr
Aleksey Arakcheev
(Budker INP SB RAS)
Mr
Dmitriy Starostenko
(Budker INP SB RAS)
Dr
Sergey Popov
(Budker INP SB RAS)
Dr
Stanislav Sinitsky
(Budker INP SB RAS)
Mr
Valeriy Danilov
(Budker INP SB RAS)
Mr
Victor Kurkechekov
(Budker INP SB RAS)
Dr
Vitaly Astrelin
(Budker INP SB RAS)
Mr
Yuriy Trunev
(Budker INP SB RAS)
