Some Measurements on a Hydrogen Plasma in a Magnetic Well

Abstract

The behavior of a hydrogen plasma inside a coil which gives a vacuum magnetic field with minimum |B| properties, has been studied in some detail. Streak and framing pictures were taken and the variation of electron density with time was measured. During the first half-cycle of the coil current, the plasma appeared to be stable. The experiment were carried out at relatively low energy. For purposes of comparison, a theta pinch was studied using the same capacitor bank.

The excitation of a monochromatic wave during steady injection of an electron beam into a plasma

“…The energy density in the wave is determined by the relationship (10) 1 A similar relationship otV(r) for the time problem was obtained in Ref. [2]. The only difference is that in Ref.…”

“…The only difference is that in Ref. [2] the time for attainment of the first maximum is less by the amount AT =2.5 (in the dimensionless units used in Ref. [l]); thereafter the curves of f(r) obtained in both papers reproduce each other with great accuracy.…”

“…A sit is known [5], the presence of this region has the result that when yt > 1 the increase in amplitude is described in the linear theory by an asymptotic formula E(t) =E(0) [uCde/dw)]" 1 exp(yt) (in the case under consideration e = 1 -(wp/cj 2 ) -(ub de/dm =<6/w), and not by the formula E(t) = E(O)exp(yt), as it is assumed inRef. [2],…”

“…The time evolution of a monochromatic perturbation in a plasma-"cold" electron beam system was considered in Refs [1,2]. In connection with experimental investigations of beam instability in "single mode" conditions (see, for example, Ref.…”