DE1040703B - Zero-slot magnetron with external cathode - Google Patents

Description

GERMAN

Attempts have often been made to determine the position of the anode in a magnetron tube and swap cathode. The advantages lie in the lower specific load on the cathode. There are positive results for the multi-slot tube (Hull, Proc. IRE, 1952, p. 1038).

The zero-slot tube is of particular interest because of its wide tuning range. Because of the peculiar Electron sequence (Fritz, Telefunken-Zeitung 72, 1936, pp. 31 to 36) is a simple one Exchanging the anode for the cathode is not possible, because the central cathode must be thin, so that the correct-phase electrons voider on their helical path even with a low energy output Can reverse the cathode and release its energy in stages through repetition.

1 shows the sequence in a schematic representation of a cross section through the tube; 1 is the cathode and 2 is the anode. This is no longer possible with the inverse zero-slit magnetron (Fig. 2). If the energy output is small, the correct-phase electron also returns to the cathode, only with a return angle β that is less than 90 °.

So that the electron can continue to run in this case too, according to the invention, a Zero slit magnetron with a central rod anode and a cylindrical cathode arranged concentrically to it the cathode cylinder is divided into axially parallel segments, of which into regular segments alternately one part is emitted and the other part through non-emitting pockets or indentations is formed, which are dimensioned such that the in the discharge space under the action of axial Field components while electrons running in phase have space to execute the reversal curve the out-of-phase electrons strike the protruding cathode segments and are sorted out. A division κ = 6 is preferably proposed for the segment division. Only the one on that Segments lying on a smaller radius need to emit, while those on the larger one, however not.

Fig. 3 of the drawing shows an inverse zero slot magnetron according to the invention in cross section in schematic representation. With 2 the central anode is indicated, and with 1 are those on the Ka zero-slot magnetron with external cathode

Applicant:

German Electronics GmbH,
Berlin-Wilmersdorf, Forckenbeckstr. 9-13

Dr. Karl Fritz, Darmstadt,
has been named as the inventor

method radius 3 lying cathode segments referred to. In dashed lines are two of one emitting Segment 1 outgoing electron trajectories are drawn, their reversal curves 5 before pocket-like receding neighboring segment 4 lie. In the example, the tube is heated indirectly. the Heaters are denoted by 6. The oblique run-off is created in a known manner by axial field components of the electrons causes and achieves that the processed electrons land on the anode. By The use of resonance lengths in the segments can improve the energy expenditure and the order of vibration can be reduced in size.

Claims (2)

Pa TENT CLAIMS: 1. Zero-slit magnetron with a central rod anode and a cylindrical one arranged concentrically with it Cathode, characterized in that the cathode cylinder is in axially parallel segments is divided, of which a part emits and the other in a regularly alternating sequence Part is formed by non-emitting pockets or indentations that are dimensioned in this way are that the electrons running in phase in the discharge space space to carry out the Have reversal curve. 2. Zero slot magnetron according to claim 1, characterized by a segment pitch M = 6. Considered publications:
German Patent No. 704,248;
French patent specification No. 869 047. 1 sheet of drawings