Precision of Intense Electron Beams Transported in Vacuum by Applied Magnetic Field

G. Mueller1 , V. Engelko2 , H. Bluhm1 , V. An1 , V. Kuznetsov2, G. Viazmenova2

1- Forschungszentrum Karlsruhe, Institut für Hochleistungsimpuls- und Mikrowellentechnik, Postfach 3640, D-76021 Karlsruhe, Germany

2- Efremov Institute of Electrophysical Apparatus, 189631, St. Petersburg, Russia


Measurements of the spatial distribution of the beam current density in the GESA-facilities shows that the current density oscillates in time although the total beam current is stable. To investigate the nature of these oscillations results from different diagnostics for current and power density measurements have been analyzed (Faraday cups, small metal plates, x-ray detectors, etc.). It was found that oscillations of the beam current density are due to spatial movement (rotation) of the whole beam. The amplitude and appearance of this beam precision strongly depends on magnitude and distribution of the applied magnetic field. It was found that:

In this paper we discuss the results of current density measurements and the possible reasons for the appearance of beam precision during the pulse.