DE1439260A1 - High power electron gun - Google Patents

Description

SociSte Generale d ^f ApplL.cation3 Electro-Ihermiques, Boulogne

"High Power Electron Gun"

It has long been possible to produce high-efficiency electronic cannons, to construct whose power is of the order of 100 kW can be achieved by using indirectly heated metal cathodes and jocalization electrodes are used whose shape is meticulous that corresponds to a rheographic bowl.

In the case of such electron guns, however, to the extent to which their average power increases, so must that for heating
The power used in the cathode can be increased, and it also makes it difficult to dissipate the amount of heat released in the gun. On the other hand, it is necessary to heat the cathode uniformly in order to prevent certain elements of its
The surface will overheat and the metal cathode will then be under
bad conditions works.

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U39260

The purpose of the invention is to increase the performance of electron guns. This is achieved through measures through which the indicated in the "previously" known gate directions of these Type of difficulties that arise are avoided

According to a first characteristic of the invention, the cathode of the electron gun is operated indirectly by means of an auxiliary electron gun heated »This auxiliary cannon produces a relatively elongated one Electron bundle, the one that hits the cathode Electrons there cause an even flow of heat.

According to a further feature of the invention, the support of the cathode has such dimensions that a slight cooling of the overall arrangement is possible.

By applying the two features identified above together, the double precondition, namely:

Uniformity of the heating of the cathode and cooling of the cathode carrier '

met and thereby made it possible to use the power of electron guns to increase significantly.

According to one embodiment of the invention, the cathode support is cooled by nozzles, one of which is an insulating nozzle Coolant is injected into the interior of its wall,

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whereupon this liquid is then cooled in a heat exchanger and returned to the cycle.

According to another embodiment of the invention, the cathode support cooled by the passage of a cooling liquid through a double dumbbell surrounding it.

The following are given, as examples only, of the invention is in no way limited to two embodiments of electron guns with the features of the same in detail of the illustrations.

Fig. 1 is an axial longitudinal section through an electron gun with cooling by injection nozzles «,

Fig. 2 is an axial longitudinal section through an electron gun with cooling through a water jacket.

The electron gun shown in Fig. 1 has a massive cathode 1 indirectly heated by the impact of electrons, This heating is carried out by an auxiliary cannon which has a cathode 2 and an anode 3.

The cathode 2 of the auxiliary gun can consist of a wire, which is wound so that it forms the desired cathode surface. In this case, it is heated by the Joule effect. The power supply of the auxiliary cannon takes place via lines, which

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are connected to the carrier 4 of the cathode and passed through a tube 5, which in turn in a itself a tube 7 preferably made of aluminum oxide Metal bracket 6 is attached.

On this bracket 6 is a preferably made of molybdenum Tube 9 attached, which the auxiliary cathode 2 and a focusing electrode 10 carries.

The carrier of the main cathode 1 consists of a cylindrical one Metal body 11, on which this cathode via the electrode 12. is attached. The base 8 is attached to the other end of the carrier 11.

The auxiliary anode 3 is brought to the same potential as the Cathode 1. The auxiliary cathode 2, however, is on a opposite dea? Main cathode 1 brought lower potential.

Instead of an auxiliary cathode heated by the Joule effect, a cathode that is solid as such can also be used, which indirectly by centrifuging by means of a G-filament is heated by electrons.

The main anode of the cannon is labeled 13.

In the embodiment shown in Hg. 1, the Cooling of the cannon by flowing through a cooling liquid,

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e.g. of oil, which through connecting lines 14 and injection nozzles 15 is supplied, which extends through in a thickening 11a of the carrier 11 provided bores 14 extend. After exiting the nozzles, the cooling liquid is in one Ring channel 17 collected and fed through a line 18 to a heat exchanger in which it is in turn cooled, in order to be fed again to the injection nozzles.

The lines for the cooling liquid, which are generally made of copper, have areas under high voltage on the cannon and on the ground connected to the heat exchanger areas. These two areas are through one Line section made of insulating material connected to each other, which can withstand the voltage differences according to the usual aspects.

The main anode 13 is also cooled by a flowing cooling liquid which is supplied through a line 19 and Via the areas 20 and 21 separated by a baffle plate 23 flows to exit through line 22.

described electron gun is of course by a housing and the usual devices for generating the Vacuum, focus adjustment, etc. completed.

Fig. 2 shows a modified embodiment of the cooling system. In this figure the main cathode and main anode as well as the

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U3926Q

Auxiliary electron gun not shown. These parts can all identical or analogous to the corresponding parts of the embodiment described first.

In the case of this embodiment, the carrier 24 of the main cathode is cooled by means of a double housing, which consists of two concentric annular bodies 25, 26. The cooling liquid is in the space 27 between then. Carrier 24 and the inner ring body 25 inserted and flows on through the space 28 between the two ring bodies, in order to finally be discharged through the line 29.

Of course, the invention is not limited to the above in individually described and those shown in the figures Embodiments are limited, but there are changes, in particular with regard to the design of the auxiliary cannon and the type of cooling possible without departing from the basic idea of the invention.

■ "claims;

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Claims (1)

Patent claims: U39260- Λ β) Electron gun of high power, characterized in that its cathode is heated indirectly by electrons generated by an auxiliary electron gun which has a cathode, at least one electrode for focusing and an anode which enables the flow of electrons. 2 · electron gun according to claim 1, characterized in that the. Cathode of the auxiliary electron gun indirectly through impact by Electrons is heated by a filament. 3. electron gun according to claim 1, characterized in that the Auxiliary electron gun is designed so that they ern / elongated Generates a bundle of electrons, the electrons of which strike the main cathode evenly. 4. electron gun according to claim 3, characterized in that the Main cathode on a tubular support gsstss-sid: from so little ger mass and dimensions is stored that a slight cooling of the overall arrangement is possible. 5, electron gun according to claim 4, characterized in that the Cooling is done by an insulating liquid, which in turn is cooled in a heat exchanger. 909322/0240 COPY 6 «electron gun according to claim 4> characterized in that the cooling liquid encloses a carrier of the main cathode Double jacket flows through. Electron gun according to Claim 6, characterized in that the Cooling liquid is injected through nozzles into the interior of the jacket will ο 909822/0240 Blank page