US3889148A - Transit time amplifier tube having an attenuated delay line - Google Patents

Transit time amplifier tube having an attenuated delay line Download PDF

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Publication number
US3889148A
US3889148A US399963A US39996373A US3889148A US 3889148 A US3889148 A US 3889148A US 399963 A US399963 A US 399963A US 39996373 A US39996373 A US 39996373A US 3889148 A US3889148 A US 3889148A
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delay line
bodies
attenuating
discs
tube
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Expired - Lifetime
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US399963A
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English (en)
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Franz Gross
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
    • H01J23/24—Slow-wave structures, e.g. delay systems
    • H01J23/30—Damping arrangements associated with slow-wave structures, e.g. for suppression of unwanted oscillations

Definitions

  • ABSTRACT A transit time tube, in particular a traveling wave amplifier tube has a delay line consisting of a hollow tube of circular inner cross-section which is divided by successive transverse elements into cells. At least some of the cells are attenuated by means of attenuating bodies consisting of material subject to losses, bodies being in direct contact with the walls of the hollow tube and possessing the form of segments of the hollow tube inner cross-section of the delay line. In each case two such attenuating bodies extend from opposite sides of the walls by the same amount toward the longitudinal axis of the delay line.
  • This invention relates to a transit field amplifier tube having a delay line which comprises a hollow tube of circular inner cross-section, and more particularly to such a structure in which the hollow tube is divided by successive transverse elements into cells, at least a few of which are attenuated by attenuating bodies consisting of lossy material, the bodies being in direct contact with the walls of the hollow tube.
  • Traveling wave (TW) tubes of the aforementioned kind are known in various embodiments.
  • TW Traveling wave
  • the attenuating elements are held by special holders which project from the conductor walls, close to the electron beam, and are also brought into permanent thermal contact with the two adjacent cavity dividing walls by way of a flow of coolant.
  • This type of line design demands high precision in production and is limited in concepts with flowing coolants of variable pressure, particularly when a plurality of attenuating elements are to be utilized.
  • the object of the present invention is to provide a transit field amplifier tube, in particular a traveling wave amplifier tube of the aforementioned type, with an attenuating arrangement which acts on a wide band and which is free of the aforementioned disadvantages.
  • the attenuating bodies possess the form of segments of the cavity inner cross section of the delay line, wherein in each case two such attenuating bodies extend from diametrically opposed parts of the walls toward the longitudinal axis of the delay line by the same amount,
  • the attenuating bodies are both current and field attenuating and therefore have at their disposal a high, wide band attenuating force.
  • the heat loss which arises in the attenuating bodies is discharged on extremely short heat paths to the walls of the delay line, the attenuating bodies possessing a large area of contact and therefore a high heat contact with the easily coolable walls. Since the attenuating bodies are arranged opposite one another and extend toward the longitudinal axis of the delay line equal maximum amounts at the same level of the delay line, any asymmetry of the electromagnetic reaction due to the attenuating elements is avoided.
  • the maximum inward extents of the attenuating bodies arranged successively in the course of the delay line increases by stages, for example in accor dance with a cos rule.
  • the attenuation bodies provided in accordance with the invention prove particularly advantageous. Attenuating bodies having a greater maximum width .5 develop a larger quantity of heat which, however. is at the same time discharged by way of a larger contact surface to the walls. This structure substantially avoids any danger to the tube in the form displacement and destruction by heat as a result of a temperature gradient.
  • FIG. 1 is a longitudinal sectional view of a first embodiment of a delay line of a traveling wave amplifier tube constructed in accordance'with the invention
  • FIG. 2 is a transverse section of the delay line taken substantially along the line 11-" of FIG. 1;
  • FIG. 3 is a transverse sectional view of the apparatus of FIG. 1 taken substantially along the line III-III;
  • FIG. 4 is a transverse sectional view of the apparatus illustrated in FIG. 1 taken substantially along the line IVIV;
  • FIG. 5 is a longitudinal sectional view of a second embodiment of a traveling wave amplifier tube constructed in accordance with the invention, as viewed substantially along the line VV of FIG. 6;
  • FIG. 6 is a transverse sectional view of the apparatus illustrated in FIG. 5 taken substantially along the line VI-VI;
  • FIG, 7 is a transverse sectional view of the apparatus of FIG. 5 taken substantially along the lineVII-VII;
  • FIG. 8 is a transverse sectional view of the apparatus of FIG. 5 taken substantially along the line VIII VIII.
  • the schematic illustration of a transit field amplifier tube constructed in accordance with the invention represented in FIG. 1 illustrates only the part of the delay line which contains the attenuating elements, this part of the delay line being referenced l in FIG. 1. All of the other parts of the tube which are not essential to the invention have been omitted.
  • the delay line 1 comprises a hollow tube of circular inner cross section which is divided by transverse walls having alternating coupling slots 2 and slot coupled cavities 3.
  • the delay line 1 is a solid aligned block soldered or pressure welded from punched or photo-etched discs, more specifically alternating profile discs 4 and spacers 5.
  • the profile discs 4 forms the transverse wall serving to divide the cavities 3 and accommodates the electron beam opening 6 and the coupling slot 2, while the spacer 5 is provided with the profile of the cavities 3.
  • the amplifier tube is attenuated with attenuating bodies arranged along the longitudinal axis of the delay line.
  • the attenuating bodies 7 are in direct contact with the walls of the hollow tube (they are soldered to the walls) and in accordance with the invention form symmetrical segments of the circular inner cross section of the walls.
  • the maximum width s, which is equal for both segments is more specifically referenced s, in FIG. 3.
  • the pairs of attenuating bodies 7 which take the form of segments of circles and which are arranged opposite one another are arranged between two adjacent coupling slots 2, thus in the cavities.
  • the attenuating bodies 7 are at a position of high field strength and developing particular attenuating force for the undesired band edge oscillations, which are then pure interdigital and cavity modes.
  • FIG. 5 illustrates a second exemplary embodiment of a transit field amplifier tube constructed in accordance with the invention which differs from the first exemplary embodiment only in respect of the shape of the coupling slots 2 of the delay line 1.
  • the longest wave operating mode is a type of slot mode.
  • the pairs of attenuating bodies 7, arranged opposite one another are in each case soldered to the walls of the hollow tube 4 at the level of the coupling slots 2.
  • the attenuating bodies 7 have, for production reasons, been soldered to only one of the two different types of discs, either only to the spacer discs 5 (first exemplary embodiment) or only to the profile discs 4 (second exemplary embodiment).
  • a very simple assembly of the attenuated delay line is in fact possible if the attenuating bodies are first inserted into one of the two different types of discs, and the discs are then fastened together to form an aligned structure.
  • a transit time amplifier tube comprising a delay line including a hollow tube of circular inner cross section, said tube divided by successive transverse elements into cells, attenuating bodies in at least a few of said cells, said bodies consisting of material subject to losses and said bodies mounted in direct contact with the walls of said hollow tube, said attenuating bodies acting on a wide frequency band and having the form of segments of said circular inner cross section of said hollow tube and two of such bodies extending from opposite parts of said walls toward the-longitudinal axis of the delay line by the same width.
  • a transit field amplifier tube as claimed inclaim 1 wherein said delay line possesses an interdigital or cavity mode as the longest wave operating mode, and said attenuating bodies are arranged between adjacent transverse elements of the delay line.
  • a method of producing a delay line for a transit field amplifier tube consisting of a series of alternating profile discs and spacer discs comprising the steps of first mounting attenuating bodies into one of the two different types of discs said attenuating bodies acting on a wide frequency band, arranging the discs in the form of alternate profile and spacer discs, and fastening the arranged discs to form an aligned block.

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  • Microwave Tubes (AREA)
  • Amplifiers (AREA)
  • Microwave Amplifiers (AREA)
  • Vibration Prevention Devices (AREA)
US399963A 1972-10-23 1973-09-24 Transit time amplifier tube having an attenuated delay line Expired - Lifetime US3889148A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2251887A DE2251887C3 (de) 1972-10-23 1972-10-23 Lauffeldverstärkerröhre mit bedampfter Verzögerungsleitung

Publications (1)

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US3889148A true US3889148A (en) 1975-06-10

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US399963A Expired - Lifetime US3889148A (en) 1972-10-23 1973-09-24 Transit time amplifier tube having an attenuated delay line

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US (1) US3889148A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS5723385B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2251887C3 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2204035B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1445574A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IT (1) IT995994B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4013917A (en) * 1974-12-03 1977-03-22 Nippon Electric Company, Ltd. Coupled cavity type slow-wave structure for use in travelling-wave tube

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5512682A (en) * 1978-07-14 1980-01-29 Nec Corp Coupled cavity wave travelling tube

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3153767A (en) * 1960-06-13 1964-10-20 Robert L Kyhl Iris-loaded slow wave guide for microwave linear electron accelerator having irises differently oriented to suppress unwanted modes
US3360679A (en) * 1964-02-21 1967-12-26 Varian Associates Electron discharge device having lossy resonant elements disposed within the electromagnetic field pattern of the slow-wave circuit
US3365607A (en) * 1963-09-20 1968-01-23 Varian Associates Electron discharge device
US3412279A (en) * 1965-09-13 1968-11-19 Varian Associates Electromagnetic wave energy absorbing elements for use in high frequency electron discharge devices having traveling wave tube sections
US3453491A (en) * 1965-01-25 1969-07-01 Hughes Aircraft Co Coupled cavity traveling-wave tube with improved voltage stability and gain vs. frequency characteristic
US3602766A (en) * 1969-02-12 1971-08-31 Hughes Aircraft Co Traveling-wave tube having auxiliary resonant cavities containing lossy bodies which protrude into the slow-wave structure interaction cells to provide combined frequency sensitive and directionally sensitive attenuation

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3153767A (en) * 1960-06-13 1964-10-20 Robert L Kyhl Iris-loaded slow wave guide for microwave linear electron accelerator having irises differently oriented to suppress unwanted modes
US3365607A (en) * 1963-09-20 1968-01-23 Varian Associates Electron discharge device
US3360679A (en) * 1964-02-21 1967-12-26 Varian Associates Electron discharge device having lossy resonant elements disposed within the electromagnetic field pattern of the slow-wave circuit
US3453491A (en) * 1965-01-25 1969-07-01 Hughes Aircraft Co Coupled cavity traveling-wave tube with improved voltage stability and gain vs. frequency characteristic
US3412279A (en) * 1965-09-13 1968-11-19 Varian Associates Electromagnetic wave energy absorbing elements for use in high frequency electron discharge devices having traveling wave tube sections
US3602766A (en) * 1969-02-12 1971-08-31 Hughes Aircraft Co Traveling-wave tube having auxiliary resonant cavities containing lossy bodies which protrude into the slow-wave structure interaction cells to provide combined frequency sensitive and directionally sensitive attenuation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4013917A (en) * 1974-12-03 1977-03-22 Nippon Electric Company, Ltd. Coupled cavity type slow-wave structure for use in travelling-wave tube

Also Published As

Publication number Publication date
JPS4975059A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-07-19
JPS5723385B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1982-05-18
FR2204035B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1978-10-06
GB1445574A (en) 1976-08-11
DE2251887B2 (de) 1974-08-29
DE2251887A1 (de) 1974-05-02
DE2251887C3 (de) 1975-04-10
IT995994B (it) 1975-11-20
FR2204035A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-05-17

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