Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Rainer Labitzke

Gösta Mattausch

Volker Kirchhoff

Christoph Metzner

Fred Fietzke

Jörg Kubusch

Henry Morgner

Frank-Holm Rögner

Peter Frach

André Weidauer

Stefan Weiss

Torsten Werner

Ralf Blüthner

Hagen Bartzsch

Henrik Flaske

Burkhard Zimmermann

Severin Dominok

Michael Junghähnel

Lars Klose

Matthias Gittner

Mattausch Gösta

Meyer Björn

Bernd-Georg KRÄTZSCHMAR

Lars Werner

Apparatuses and methods are provided for applying accelerated electrons to a gaseous medium by means of an electron beam generator, which has at least one cathode for emitting electrons and at least one electron exit window, wherein a) the at least one cathode is annular and the at least one electron exit window is in the form of an annular first hollow cylinder, the annular electron exit window in the form of the first hollow cylinder forms an inner wall of an annular housing of the electron beam generator, wherein the electrons emitted by the cathode are accelerated to the ring axis of the annular housing; b) an annular second hollow cylinder is arranged within the electron exit window in the form of the first hollow cylinder and delimits an annular space between the first hollow cylinder and the second hollow cylinder; c) a cooling gas is fed through the annular space between the first hollow cylinder and the second hollow cylinder; and d) the gaseous medium to which accelerated electrons are to be applied is fed through the second hollow cylinder.

Apparatus and method for applying accelerated electrons to gaseous media

An apparatus for suppression of arcs in an electron beam generator including: a first module providing an operating voltage; a second module including a coil suitable for a voltage of at least 10 kV, and at least one free-wheeling diode connected in parallel to the coil; a third module including a first circuit component configured to detect a first actual value for electric voltage, and a first signal is producible when the first actual value falls below a first threshold value, a second circuit component by which a second actual value for electric current is detectable, and a second signal is generated when the second actual value exceeds a second threshold value, a control logic, which optionally links the first and second signals and a resultant output signal is producible; a semiconductor-based switch suitable for the voltage of at least 10 kV, which is opened based on the output signal.

Apparatus for suppression of arcs in an electron beam generator

An apparatus for generating a hollow cathode arc discharge plasma, including two plasma sources, each including a hollow cathode and an electrode which is associated with the hollow cathode and which has an opening that extends through the electrode, wherein the hollow cathodes of the two plasma sources are connected to a pulse generator which generates a bipolar, medium-frequency pulsed voltage between the two hollow cathodes. Here, in each of the two plasma sources, the hollow cathode is connected in an electrically conducting manner, directly or with interconnection of at least one current direction limiting component, to the associated electrode.

Apparatus for generating a hollow cathode arc discharge plasma

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Dresden, Germany

Rainer Labitzke