Transport of a high-intensity electron beam in neutral gases

Abstract

Head-on domains having saw-tooth wall configurations in Ni/Fe/Co films are discussed in relation to the existing theoretical models. The existence of Ndel tails within such wall structures as previously proposed is supported and discussed with respect to: (a) direct magneto-optic observations and measurements, and (b) a comparison of the predicted saw-tooth amplitude and angles with the observed values.A large number of films were investigated and the wall angles were found to be dependent upon the ratio of the coercivity to anisotropy field, Hc/ffk, as predicted in the Ndel tail model, whilst the saw-tooth amplitude was determined predominantly by the coercivity. Effective wall widths of the order of 100 Km have been observed in 0.14 pm thick 18/17/3 Ni/Fe/Co films.

Pulsed Electron Beam Propagation in Oxygen

“…Assumed that the beam current is not closed on plasma that is typical for oxygen in the studied region of pressures, it is possible to calculate the number of electrons falling on the walls of the drift chamber subtracting the q 2 charge from the q 1 charge and dividing the obtained value by the electron charge. Thus, under pressures of 50, 300, and 760 Torr these values are 3.7·10 14 , 9.9·10 14 , and 14.8·10 14 , respectively. The energy losses registered by the radiation monitoring film on the walls of the drift chamber show that a part of electrons whose energy is enough to form the color center in the radiation monitoring film decreases with increasing the pressure.…”

“…A literature analysis revealed numerous investigations into the interaction of high-intensity electron beams with preformed plasma [11][12][13]. A large number of experiments related to the transport of high-current electron beams are carried out using neutral gas as a medium [14][15][16][17]. The arising peculiarities are above all determined by the gas ionization at the rising edge of the beam, which depends not only on the parameters of the injected beam, but also on the chemical composition of the gas and the working pressure in the drift chamber.…”