We present the results of particle-in-cell numerical simulations of one-dimensional, time dependent, fully relativistic double layers. We extend the scaling law for the layor width to relativistic potential drops and plasma temperatures. We also discuss quantitatively the layer creation and disruption cyclcs, as well as the beam-plasma instabilities driven by the layer. Relativistic double layers may be a mechanism to produce inknse radiation as observed in active galactic nuclei and pulsars, primarily by collective bremsstrahlung involving the charge-bunched electron beam and background plasma electrons. We will discuss the radiation spectrum and total power emitted by this process based on the degree of beam-plasma bunching observed by the numerical simulations. Tuesday Morning, 23 nay 1989 Poster Session 3P12-18: DIODES; ION, ELECTRON AND PLASMA SOURCES-I1
~1 1 .~ at this point and decrease exponentially with distance downstream fror the discharge. The electron energy diatribution functions are non-Uaxwellian and below 3 mtorr more closely follow a Druyvesteyn distribution with average energies of 5-8.5eV. Ion energies to a grounded substrate are typically 10-25eV with fev if any high energy (>25eV) ions. J. Asmussen andM. Dahimene, J.
curved trajectories. In this talk, we report theoretical studies of novel geometries of transverse conductors that exert strong steering forces. We extend the concept of foil focusing to structures that are non-uniform in the transverse direction. The limiting case is an axial array of single wires along a diameter of the transport tube.The strong steering force and high transparency of wire arrays suggest applications to circular accelerators such as recirculating induction linacs [6]. As an example of capabilities, a wire array can contain a 50 MeV, 30 kA electron beam with a tube radius of curvature of only 0.5 m. More important, an energy error o f 20 MeV shifts the beam axis only about 1 mm. The high momentum acceptance may have application to multi-pass recirculators.We shall describe the theory of high current beam transport in a wire array. We also discuss new applications of transverse wire arrays, including beam funnels, wire wigglers , septa €or high intensity beam extraction, and high power m'icrowave sources based on wire focusing.
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