DE2053483A1 - Run-time pipes - Google Patents

Description

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20 * 63483

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KoppeXechlitz · coupled tmd are »it a lossb · - adhered to energy-releasing material sorblerea coated with the vibration energy coupled with it. Furthermore, the hollow r & ys * for the mode under ** pressing by pins capacitively loaded «ad» lad sua suppress unauthorized modes staggered abgsstiaat.

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to use » aim em die Verxeeeruoe« lelt «Bg» which la the side vents of the TerxOgeruneleitung Torgeeehen «are coupled via elongated coupling panels. These

eind half · wavelength long "a" _r-t Pedrt extended gekrOeert "ei dea dar Peealattleltung with decreasing height in the

B-level and »Imd rerluetbehaftet at their bit ·» Material is absorbed by Schvingunga energy previously coupled to them. The B "hlrsxsM Zwr ÄodusunterdrUokung act as a high-pass filter for a load and suppress * tape catalytic converter" ad ends "high frequency modes such as slot aodl act. However, Si · increase "rhehllch dea Durcbjeesasr the cloverleaf line vau ± therefore require asm focusing the KLektronenstrahle • Inen grö0erea Slektroaagnet when he wire for a nloat hohlrauabelastete Kleeblettleitueg warning operating at the same frequency required.

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10 9 8 19/1367

Brief description of the invention

The invention is essentially based on the object an improved mode canceller for a delay line eus coupled cavities to accomplish*

According to one feature of the invention, a delay line is made up of coupled cavities the conductive lugs protrude into the coupled cavities, cavities provided for mode suppression, which resonate at or near the frequency of undesired delay line modes, at least are partially arranged in the noses and with the fields of the delay line via elongated coupling diaphragms are coupled, which are provided in the sidewalls of the lugs of the delay line, whereby the unwanted resonance modes are effectively suppressed, without the diameter of the delay canc. c? - tion would be increased significantly.

In addition, according to the invention, the mode suppressing cavities to reduce their physical size so that they are easily accommodated within the lugs of the delay line can be capacitively loaded.

In addition to one of the features mentioned, according to the invention, the mode-suppressing cavities to a resonance near the ir mode of the delay line be tuned to suppress the undesired upper lower edge oscillation of the Delay line

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Further features and advantages of the invention emerge from the following description of an exemplary embodiment with reference to the drawing. Show it:

FIG. 1 shows a schematic length section of a Ge-Bohfrequenzeinodulstione electron tube »It Markaalen of Invention;

FIG. 2 shows an enlarged cross section of an execution of the tube according to FIG. 1 in a plane 2-2 in FIG Figure 1, seen in the direction of the arrow;

FIG. 3 shows a section through the embodiment according to FIG. 2 in a plane 3-3 »seen in the direction of the arrow; and

FIG. 4 shows an a- (I diagram _v the dispersion characteristics of the cloverleaf delay line according to FIGS.

FIG. 1 schematically shows a microwave speed modulation electron tube 1, the knee Ie according to the invention. The drill 1 is general according to USA-Fetentschrift 3,289,032. It also has a clover leaf delay line in accordance with USA-F8tentechrift 3 233 139. Briefly described the tube 1 has at one end an electron beam generating system 2 for forming and Projecting an electron beam along an elongated Elektroneactrehlwegee 3 & u ein

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Electron beam catcher 4 at the end of the path is arranged · The electron beam catcher 4 takes the beam and leads its energy away · Along the Lane 3 is related to the electron gun 2 and the catcher 4, an interaction circle 5 is arranged; by electromagnetic interaction with the Electron beam becomes an amplified output signal generated, which is taken from the line 5 via an output waveguide 6 · A not shown Cylinder coil surrounds the interaction circle 5 coaxially for focusing the electron beam *

The line 5 has a number of re-entrant Driver-IIohlreumresonatoren 7 on, the successive along the electron beam path 3 to the velocity modulating the beam with RF wave energy to be amplified are arranged; the RF wave energy is fed into the upstream cavity resonator 7 * via an input waveguide 8, in which a wave-permeable, gas-tight window 9 is mounted. The driver cavity resonators 7 are staggered over a frequency band in order to obtain broadband operation * The modulated electron beam is converted into a clover leaf delay line 11 introduced, which is arranged downstream of the cavity resonators 7 and the Complement by the driver cavity resonators The gain achieved and the removal of the amplified output signal from the electron beam is used.

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The cloverleaf-delay line 11 includes a number of mutually negative inductively coupled cavity resonators which are arranged behind one another along the Elektronenstreblweges 3 · The str8hlsufwärtigste the coupled cavity resonators with a Ohm see * load 12 completed to a uner wished Heflektion to prevent vibration energy, which Otherwise, undesirable vibrations in the delay line 11 could be produced.The electron beam generation system 2, the interaction line 5 and the collector 4 are enclosed in an evacuated vessel 13, which is completed in the Auegengs waveguide 6 by a wave-permeable microwave window 14 iat _y that close above the Waveguide 6 is used.

The interaction circuit 5 » the electron beam catcher 4 and the anode of the electron gun 2 are usually operated at ground potential, while the hot cathode 15 of the electron gun ait against the anode, delay line 5 and catcher 1- negative pulses via a cathode pulse generator 16 is pulsed with the negative voltage of a Power source 17 state, whose positive terminal is grounded * The Ksthodenenitter 1 ^ is thus pulsed from ground potential up to the order of • 140 kV to ground by the pulse generator 16 to initiate the drive of the tube and build up the beam voltage. In a typical example, tube 1 produces a peak power output of 5 MV / in C-band over a bandwidth of 10 #.

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Figures 2 and 3 show a physical implementation of the clover leaf delay line 11, dreary Features according to the invention: The line 11 has a number of coupled cavity resonators 21, which successively along the electron beam J are arranged for electromagnetic interaction with the electron beam · The common Wall 24 between two adjacent cavity resonators 21 has a pattern of eight radially directed elongated coupling slots 22, which are in mutual circumferential distance in relation to four rediel directed, inwardly projecting conductive lugs 23 are arranged. The end walls 24 of the resonators each have an opening 25 in the middle for creation of passages that allow the electron beam to pass through «The lugs 23 are in successive adjacent cavity resonators offset from one another by 3-5 ° to a negative to obtain mutual inductive coupling through the coupling slots 22.

The resulting trefoil line 11 has a diapersion characteristic according to FIG TT phase shift of the electric field between adjacent cavities from · An operating band with a typical bandwidth of 10 to 20 # is obtained between the frequencies U ^ and u2, as indicated in Figure 4 at 26 ·

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The beam voltage rises when applying zero volts to the operating voltage en, as indicated by an arrow Vq When the beam voltage Vq increases it passes through the ir mode resonance and already has certain undesirable Bendksnt vibrations beforehand the line 11 above the upper frequency of the operating band 26 is excited.

These undesirable Bendkentenech vibrations are effectively eliminated in the tube 1 according to the invention by the four mode-suppressing cavities 27, which k at least partially within the noses 2? Each of the P-coupled cavity resonators 21 of the cloverleaf delay line 11 are subordinate to the mode-suppressing cavities 27 are coupled to the fields of the delay line through awei elongated coupling slots 28 _t which lead through the side walls of the lugs 23 and thus a vibrational energy connection between the coupled cavity resonator 21 and the Make mode suppressing cavities 27.

The mode suppressing cavities 27 are sbgeetirarat at a resonance near the T-mode resonance frequency of the delay line 11, and the inner walls of the mode suppressing cavities 27 are coated with a vibration energy damping material such as an alloy of 5.5 # Al, 22 % Cr , 1/2 % cobalt, remainder iron, to dampen the vibrational energy coupled from the delay line 11 into the mode suppressing cavities 27

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The mode suppressing cavities 27 have ^ e a capacitive load on, stupid pins 29 ^ so that their physical dimensions can be reduced so far * that they are easily within the body 13 can be accommodated. The capacitive blasts Lastungsetifte 29 »which for example consist of copper, protrude from a wide wall of the mode-suppressing Cavities 27 in the direction of the opposite wall au and create a capacitive Gap 31 in a space between their free End and opposite walls make an adjustment the size of the capacitive gap 31 gives the opportunity the tuning of the resonance frequency of the cavities 27 »

The mode-suppressing cavities 27 are tuned to slightly different frequencies, which are distributed over the band of the band-edge vibrations. Thus, each of the four mode-suppressing cavities, each coupled to one of the coupled cavity resonators 21 of the delay line 11, are tuned to a slightly different frequency and the frequencies are distributed over the band of unwanted edge vibrations Band frequencies, the structure of the pins 29 may be unnecessary, since the cavities can be of a sufficiently small size to be easily inserted into the vessel 13 without reducing their physical size due to the capacitive load

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can be inserted · The coupling slots 23 are in elongated in the radial direction, i.e. in a direction perpendicular to the longitudinal axis to the path 3 of the electron beam, and expediently have a length in the region of half a wavelength at the center frequency of the undesired band edge vibrations in order for the undesired modes of the cavity resonators 21 a to achieve strong coupling.

Arranging the mode suppressing cavities 27 in the noses 2? the line significantly increases the damping effect of these cavities, de thereby the Coupling plates 28 in areas of a more intense Magnetic field for modes with resonance frequencies close to the upper band edge frequency ο 2. These Attenuation is obtained without increasing the diameter of the delay line. In addition, the Arrangement of the mode suppressing cavities in the noses two elongated Köppelschlitzen 28 for coupling vibrational energy into each of these cavities 27 possible. This considerably facilitates the strong coupling sought between the fields of the hollow resonance resonators 21 of the delay line 11 and ... the mode suppressing cavities 27 · £ s are in each of each of the cavity resonators 21 of the delay line 11, mode suppressing cavities 27 · The mode suppressing cavities 27 can be set to any undesirable vibration mode in the delay lock order to suppress this mode must be matched · Examples of such undesirable modes include the 5H ~ Modl and Slot modes

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In addition, the coupled cavity resonators 21 of the delay line 11 are expediently coated with lossy damping material to suppress certain undesired vibration modes in a known manner.This material is, for example, an alloy of 5.5 # Al, 22 56 Cr, 1/2 % cobalt and the remainder iron .

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Claims (4)

, j Patent attacks Drift tube having a delay line coupled to one another cavities, characterized in that the cavities conductive rabbits (23) * in the Bohlrau "inside," project "tim j old the (27) are coupled so that coupling braid (28) in the lugs (23) of the delay line (11) suppresses the body Coupling cavities (27) bits to the fields of the undesired oscillation modes within the delay line (11) and that at least a portion of each of the sub-depressing cavities (27) within the rabbits (23) of the delay line (11) is arranged. 2. Tube according to claim 1 »characterized in that two Coupling slots (28) on opposite sides of each hub (23) are arranged and dad the pair of slots in the direction is elongated generally perpendicular to the axis of the electron beam (3) * 3. Tube according to claim 1 or 2, characterized by a concentrated capacitive load (29, 31) in the springs mode suppressing cavities (27) to reduce their physical size for a given «resonance frequency. 4. Tube according to claim 1, 2 or 3 »characterized in that the mode-suppressing cavities (27) to a resonance in the Hfihe dvr T'-Medus-Rosooanzfrequenz u« r delay line (11) to suppress unwanted vibrations at the upper Bendkaate Delay line are matched. SAD ORfQtN ^ 10 9 8 19/1367 5 tube according to claim 4, characterized in that that with each of the cavities (21) of the delay line (11) four mode suppressing cavities (27) are coupled, each of which euf a different frequency within a near the? Mode resonance frequency the delay line (11) centered frequency band and above the operating band this line is coordinated 6. Tube according to claim 1, characterized by a coating that dampens the wave energy the inner surface of each of the mode suppressing cavities (27) for damping the in these cavities (27) coupled wave energy 109819/1367 Empty page