EP0402549A1 - Travelling-wave tube with a helical delay line made of boron nitride and attached to the vacuum tube - Google Patents

Travelling-wave tube with a helical delay line made of boron nitride and attached to the vacuum tube Download PDF

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Publication number
EP0402549A1
EP0402549A1 EP89401635A EP89401635A EP0402549A1 EP 0402549 A1 EP0402549 A1 EP 0402549A1 EP 89401635 A EP89401635 A EP 89401635A EP 89401635 A EP89401635 A EP 89401635A EP 0402549 A1 EP0402549 A1 EP 0402549A1
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EP
European Patent Office
Prior art keywords
boron nitride
delay line
supports
wave tube
travelling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89401635A
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German (de)
French (fr)
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EP0402549B1 (en
Inventor
Didier Grauleau
Dominique Henry
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Thales SA
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Thomson CSF SA
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Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Priority to DE1989616014 priority Critical patent/DE68916014T2/en
Publication of EP0402549A1 publication Critical patent/EP0402549A1/en
Application granted granted Critical
Publication of EP0402549B1 publication Critical patent/EP0402549B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J23/26—Helical slow-wave structures; Adjustment therefor

Definitions

  • the present invention relates to a traveling wave tube comprising a helical type delay line fixed to a sheath by means of dielectric supports made of boron nitride.
  • the invention relates to the field of traveling wave or TOP tubes having a helical type delay line, that is to say for example a simple helical delay line, of the "ring and bar” type, of the type “ring and loop” ...
  • the delay line will in the following be assimilated to a simple propeller.
  • the helical delay line is placed in a cylindrical sheath, generally metallic, to which it is fixed by means of dielectric supports.
  • the propeller and the supports are assembled by clamping in the sleeve or sleeve.
  • the propeller is made of tungsten for example and the supports of quarz, alumina, glucine or boron nitride for example.
  • the sleeve can for example be made of copper or stainless steel.
  • the propeller is brazed to the dielectric supports which are brazed to the sleeve.
  • the propeller can then be made of copper, as well as the sleeve, and the dielectric supports can be made of beryllium oxide for example.
  • Three dielectric supports are generally used which are regularly distributed at 12O ° from one another.
  • the present invention proposes to solve the problems which arise when using dielectric supports made of boron nitride.
  • Boron nitride is used because its thermal conductivity is good and its dielectric constant low, of the order of 3 for anisotropic boron nitride; this low dielectric constant means that the energy does not concentrate in the dielectric supports and improves the coupling impedance.
  • the Applicant has first deposited on the dielectric supports a slightly conductive material, such as graphite. This deposition of graphite instead of solving these problems accentuated them.
  • the present invention makes it possible to solve the problems associated with the use of dielectric supports made of boron nitride.
  • the present invention relates to a traveling wave tube comprising a helical type delay line, fixed to a sheath by means of dielectric supports made of boron nitride, and characterized in that the supports carry a layer of insulating material having a secondary emission factor greater than 1, such as for example alumina or glucin.
  • the problems associated with the use of dielectric supports made of boron nitride are resolved when these supports are coated with a layer of insulating material having a secondary emission coefficient greater than 1, because the problems observed are due the fact that boron nitride has a secondary emission factor of less than 1, under the conditions in which it is used.
  • This secondary emission factor less than 1 results in the dielectric supports taking a high negative potential over time.
  • the electron beam is defocused, a large fraction of the cathode current is intercepted. There is therefore observed a propeller current which is not constant and which can become very large.
  • FIG. 1 represents a view in longitudinal section of a traveling wave tube comprising a delay line of the helical type.
  • FIG. 2 is a cross-sectional view which shows three dielectric supports 8, arranged at 120 ° from one another, and which secure the delay line of the helix type 2 to the cylindrical sheath 3.
  • rods can have various sections: rectangular, square .... or as in Figure 2 of substantially trapezoidal shape.
  • the dielectric supports 3 are coated with a layer of insulating material 9 having a second emission coefficient may be greater than 1, such as for example alumina or glucin.

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  • Microwave Tubes (AREA)

Abstract

The present invention relates to a travelling-wave tube comprising a delay line of the helical type attached to a sleeve by way of dielectric supports made of boron nitride. …<??>According to the invention, the boron nitride supports (8) carry a layer (9) of insulating material having a secondary emission coefficient greater than 1, such as for example alumina or beryllia. …<IMAGE>…

Description

TUBE A ONDE PROGRESSIVE COMPORTANT UNE LIGNE A RETARD DU TYPE EN HELICE FIXEE A UN FOURREAU PAR L'INTERMEDIAIRE DE SUPPORTS DIELECTRIQUES EN NITRURE DE BOREPROGRESSIVE WAVE TUBE HAVING A PROPELLER-TYPE DELAY LINE FIXED TO A SLEEVE VIA BORON NITRIDE DIELECTRIC SUPPORTS

La présente invention concerne un tube à onde progressive comportant une ligne à retard du type en hélice fixée à un fourreau par l'intermédiaire de supports diélectriques en nitrure de bore.The present invention relates to a traveling wave tube comprising a helical type delay line fixed to a sheath by means of dielectric supports made of boron nitride.

L'invention concerne le domaine des tubes à onde progressive ou TOP ayant une ligne à retard du type en hélice, c'est-a-dire par exemple une ligne à retard en hélice simple, du type "ring and bar", du type "ring and loop"...The invention relates to the field of traveling wave or TOP tubes having a helical type delay line, that is to say for example a simple helical delay line, of the "ring and bar" type, of the type "ring and loop" ...

Toutefois, pour simplier l'exposé, la ligne à retard sera dans toute la suite assimilée à une hélice simple.However, to simplify the presentation, the delay line will in the following be assimilated to a simple propeller.

La ligne à retard en hélice est placée dans un fourreau cylindrique, généralement métallique, auquel elle est fixée par l'intermédiaire de supports diélectriques.The helical delay line is placed in a cylindrical sheath, generally metallic, to which it is fixed by means of dielectric supports.

Pour les tubes à onde progressive fonctionnant à des niveaux de puissance relativement peu élevés, l'hélice et les supports sont assemblés par serrage dans le fourreau ou manchon. L'hélice est en tungstène par exemple et les supports en quarz, alumine, glucine ou nitrure de bore par exemple. Le manchon peut être par exemple en cuivre ou en acier inoxydable.For traveling wave tubes operating at relatively low power levels, the propeller and the supports are assembled by clamping in the sleeve or sleeve. The propeller is made of tungsten for example and the supports of quarz, alumina, glucine or boron nitride for example. The sleeve can for example be made of copper or stainless steel.

Pour les tubes à onde progressive fonctionnant à des puis­sances plus élevées, l'hélice est brasée aux supports diélectriques qui sont brasés au manchon. L'hélice peut alors être en cuivre, ainsi que le manchon, et les supports diélectriques peuvent être en oxyde de béryllium par exemple.For traveling wave tubes operating at higher powers, the propeller is brazed to the dielectric supports which are brazed to the sleeve. The propeller can then be made of copper, as well as the sleeve, and the dielectric supports can be made of beryllium oxide for example.

On utilise généralement trois supports diélectriques qui sont régulièrement répartis à 12O° l'un de l'autre.Three dielectric supports are generally used which are regularly distributed at 12O ° from one another.

La présente invention se propose de résoudre les problèmes qui apparaissent lorsqu'on utilise des supports diélectriques en nitrure de bore.The present invention proposes to solve the problems which arise when using dielectric supports made of boron nitride.

Le nitrure de bore est utilisé car sa conductivité thermique est bonne et sa constante diélectrique faible, de l'ordre de 3 pour le nitrure de bore anisotrope ; cette faible constante diélectrique fait que l'énergie ne se concentre pas dans les supports diélectriques et améliore l'impédance de couplage.Boron nitride is used because its thermal conductivity is good and its dielectric constant low, of the order of 3 for anisotropic boron nitride; this low dielectric constant means that the energy does not concentrate in the dielectric supports and improves the coupling impedance.

Lorsqu'on utilise des supports diélectriques en nitrure de bore pour des TOP fonctionnant en continu, on constate qu'on intercepte une fraction importante du courant de cathode, cette fraction pouvant aller jusqu'à 50 % du courant de cathode. De plus, la fraction du courant de cathode qui est interceptée peut varier au cours du temps dans de fortes proportions.When using dielectric supports made of boron nitride for TOPs operating continuously, it is found that a large fraction of the cathode current is intercepted, this fraction possibly going up to 50% of the cathode current. In addition, the fraction of the cathode current which is intercepted can vary over time in large proportions.

Lorsqu'on utilise des supports diélectriques en nitrure de bore pour des TOP fonctionnant en impulsions, on observe un courant d'hélice relativement important, qui croît pendant les impulsions, et qui risque d'endommager l'hélice.When using dielectric supports made of boron nitride for TOPs operating in pulses, a relatively large propeller current is observed, which increases during the pulses, and which risks damaging the propeller.

Pour résoudre les problèmes qui se posent depuis de nom­breuses années lorsqu'on utilise des supports diélectriques en nitrure de bore, la Demanderesse a d'abord déposé sur les supports diélec­triques un matériau légèrement conducteur, tel que le graphite. Ce dépôt de graphite au lieu de résoudre ces problèmes les a accentués.To solve the problems which have arisen for many years when using boron nitride dielectric supports, the Applicant has first deposited on the dielectric supports a slightly conductive material, such as graphite. This deposition of graphite instead of solving these problems accentuated them.

La présente invention permet de résoudre les problèmes liés a l'utilisation de supports diélectriques en nitrure de bore.The present invention makes it possible to solve the problems associated with the use of dielectric supports made of boron nitride.

La présente invention concerne un tube à onde progressive comportant une ligne à retard du type en hélice, fixée à un fourreau par l'intermédiaire de supports diélectriques en nitrure de bore, et caractérisé en ce que les supports portent une couche de matériau isolant ayant un coefficient d'émission secondaire supérieur à 1, tel que par exemple l'alumine ou la glucine.The present invention relates to a traveling wave tube comprising a helical type delay line, fixed to a sheath by means of dielectric supports made of boron nitride, and characterized in that the supports carry a layer of insulating material having a secondary emission factor greater than 1, such as for example alumina or glucin.

Selon la Demanderesse, les problèmes liés a l'utilisation de supports diélectriques en nitrure de bore sont résolus lorsqu'on revêt ces supports d'une couche de matériau isolant ayant un coefficient d'émission secondaire supérieur à 1, car les problèmes observés sont dus au fait que le nitrure de bore a un coefficient d'émission secondaire inférieur à 1, dans les conditions où il est utilisé. Ce coefficient d'émission secondaire inférieur à 1 a pour conséquence que les supports diélectriques prennent au cours du temps un potentiel négatif élevé. En conséquence, le faisceau d'électrons est défocalisé, une fraction importante du courant de cathode est interceptée. On observe de ce fait un courant d'hélice qui n'est pas constant et qui peut devenir très important.According to the Applicant, the problems associated with the use of dielectric supports made of boron nitride are resolved when these supports are coated with a layer of insulating material having a secondary emission coefficient greater than 1, because the problems observed are due the fact that boron nitride has a secondary emission factor of less than 1, under the conditions in which it is used. This secondary emission factor less than 1 results in the dielectric supports taking a high negative potential over time. As a result, the electron beam is defocused, a large fraction of the cathode current is intercepted. There is therefore observed a propeller current which is not constant and which can become very large.

D'autre objets, caractéristiques et résultats de l'invention ressortiront de la description suivante, donnée à titre d'exemple non limitatif et illustrée par les figures annexées qui représentent:

  • - la figure 1, une vue en coupe longitudinale d'un tube à onde progressive comportant une ligne à retard du type en hélice ;
  • - la figure 2, une vue en coupe transversale montrant les supports diélectriques en nitrure de bore revêtus d'une couche de matériau isolant, ayant un coefficient d'émission secondaire supé­rieur à 1.
Other objects, characteristics and results of the invention will emerge from the following description, given by way of nonlimiting example and illustrated by the appended figures which represent:
  • - Figure 1, a longitudinal sectional view of a traveling wave tube having a helical type delay line;
  • FIG. 2, a cross-sectional view showing the dielectric supports made of boron nitride coated with a layer of insulating material, having a secondary emission coefficient greater than 1.

Sur les différentes figures, les mêmes repères désignent les mêmes éléments, mais, pour des raisons de clarté, les cotes et proportions des divers éléments ne sont par respectées.In the different figures, the same references designate the same elements, but, for reasons of clarity, the dimensions and proportions of the various elements are not respected.

La figure 1 représente une vue en coupe longitudinale d'un tube à onde progressive comportant une ligne à retard du type en hélice.FIG. 1 represents a view in longitudinal section of a traveling wave tube comprising a delay line of the helical type.

On a représenté de gauche à droite sur la figure 1, le canon à électrons 1, la ligne à retard du type en hélice 2 qui est fixée dans un fourreau 3, l'entrée RF 4 du tube et sa sortie RF 5, le dispositif de focalisation du faisceau 6 et le collecteur 7.We have shown from left to right in Figure 1, the electron gun 1, the delay line of the helical type 2 which is fixed in a sleeve 3, the RF input 4 of the tube and its RF output 5, the device for focusing the beam 6 and the collector 7.

La figure 2 est une vue en coupe transversale qui montre trois supports diélectriques 8, disposés à 120° l'un de l'autre, et qui assurent la fixation de la ligne à retard du type en hélice 2 au fourreau cylindrique 3.FIG. 2 is a cross-sectional view which shows three dielectric supports 8, arranged at 120 ° from one another, and which secure the delay line of the helix type 2 to the cylindrical sheath 3.

Ces bâtonnent peuvent avoir diverses sections : rectangulaires, carrées.... ou comme sur la figure 2 de forme sensiblement trapé­zoïdale.These rods can have various sections: rectangular, square .... or as in Figure 2 of substantially trapezoidal shape.

Selon l'invention, on revêt les supports diélectriques 3 d'une couche de matériau isolant 9 ayant un coefficient d'émission secon­ daire supérieur à 1, tel que par exemple l'alumine ou la glucine.According to the invention, the dielectric supports 3 are coated with a layer of insulating material 9 having a second emission coefficient may be greater than 1, such as for example alumina or glucin.

On dépose, par exemple par pulvérisation cathodique, une couche mince d'une épaisseur de 1000 Angströms par exemple.A thin layer with a thickness of 1000 Angstroms, for example, is deposited, for example by sputtering.

On constate que dans le mode de réalisation de la figure 2 que trois des quatre faces des supports diélectriques sont recouverts de la couche de matériau isolant 9. Cela facilite le dépôt de la couche de matériau isolant sur les supports sans nuire a l'efficacité de l'invention. Il n'est en effet pas utile que la partie de la section transvale des supports qui se trouve en contact avec le fourreau soit recouverte du matériau isolant 9.It can be seen that in the embodiment of FIG. 2 that three of the four faces of the dielectric supports are covered with the layer of insulating material 9. This facilitates the deposition of the layer of insulating material on the supports without adversely affecting the efficiency of the invention. It is in fact not useful for the part of the cross-section of the supports which is in contact with the sheath to be covered with the insulating material 9.

Claims (3)

1. Tube à onde progressive comportant une ligne à retard (2) du type en hélice, fixée à un fourreau (3) par l'intermédiaire de supports diélectriques (8) en nitrure de bore, caractérisé en ce que les supports (8) portent une couche (9) de matériau isolant ayant un coefficient d'émission secondaire supérieur à 1.1. traveling wave tube comprising a delay line (2) of the helical type, fixed to a sheath (3) by means of dielectric supports (8) made of boron nitride, characterized in that the supports (8) carry a layer (9) of insulating material having a secondary emission coefficient greater than 1. 2. Tube à onde progressive selon la revendication 1, carac­térisé en ce que ce matériau isolant est de l'alumine ou de la glucine.2. traveling wave tube according to claim 1, characterized in that this insulating material is alumina or glucin. 3. Tube à onde progressive selon l'une des revendications 1 ou 2, caractérisé en ce que la partie de la section transversale des supports qui est en contact avec le fourreau n'est pas recouverte de la couche (9) de matériau isolant.3. traveling wave tube according to one of claims 1 or 2, characterized in that the part of the cross section of the supports which is in contact with the sheath is not covered with the layer (9) of insulating material.
EP89401635A 1984-12-18 1989-06-13 Travelling-wave tube with a helical delay line made of boron nitride and attached to the vacuum tube Expired - Lifetime EP0402549B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1989616014 DE68916014T2 (en) 1989-06-13 1989-06-13 Running tube with helical delay line, which is attached to the vacuum envelope by means of dielectric boron nitride support rods.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8419363A FR2629634B1 (en) 1984-12-18 1984-12-18 PROGRESSIVE WAVE TUBE HAVING A PROPELLER-TYPE DELAY LINE FIXED TO A SLEEVE THROUGH BORON NITRIDE DIELECTRIC SUPPORT

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EP0402549A1 true EP0402549A1 (en) 1990-12-19
EP0402549B1 EP0402549B1 (en) 1994-06-08

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EP89401635A Expired - Lifetime EP0402549B1 (en) 1984-12-18 1989-06-13 Travelling-wave tube with a helical delay line made of boron nitride and attached to the vacuum tube

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EP (1) EP0402549B1 (en)
FR (1) FR2629634B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0534762A1 (en) * 1991-09-27 1993-03-31 Nec Corporation Dielectric support rod for a traveling-wave tube

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* Cited by examiner, † Cited by third party
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US5038076A (en) * 1989-05-04 1991-08-06 Raytheon Company Slow wave delay line structure having support rods coated by a dielectric material to prevent rod charging
JP2946989B2 (en) * 1993-02-03 1999-09-13 日本電気株式会社 Spiral slow-wave circuit structure and method of manufacturing the same
JPH08111182A (en) 1994-08-17 1996-04-30 Toshiba Corp Slow-wave circuit structure for traveling wave tube and its manufacture
FR2758888B1 (en) * 1997-01-27 1999-04-23 Thomson Csf PROCESS FOR FINE MODELING OF CLOUD GROUND RECEIVED BY RADAR
JP3520396B2 (en) * 1997-07-02 2004-04-19 セイコーエプソン株式会社 Active matrix substrate and display device
EP1505648A3 (en) * 1997-08-21 2005-08-10 Seiko Epson Corporation Active matrix display device
JP3580092B2 (en) * 1997-08-21 2004-10-20 セイコーエプソン株式会社 Active matrix display
FR2787918B1 (en) 1998-12-23 2001-03-16 Thomson Tubes Electroniques MULTIBAND PROGRESSIVE WAVE TUBE OF REDUCED LENGTH CAPABLE OF OPERATING AT HIGH POWER
US6221563B1 (en) 1999-08-12 2001-04-24 Eastman Kodak Company Method of making an organic electroluminescent device
US6899507B2 (en) * 2002-02-08 2005-05-31 Asm Japan K.K. Semiconductor processing apparatus comprising chamber partitioned into reaction and transfer sections
US6917162B2 (en) * 2002-02-13 2005-07-12 Genvac Aerospace Corporation Traveling wave tube
CN100339928C (en) * 2003-07-21 2007-09-26 中国科学院电子学研究所 Combined extrusion method using transition cellpacking to realize helical slow-wave structure
JP2006134751A (en) * 2004-11-08 2006-05-25 Nec Microwave Inc Electron tube
FR2883409B1 (en) * 2005-03-18 2007-04-27 Thales Sa METHOD FOR MANUFACTURING A TOP WITH REDUCED CHARGE EFFECT
CN104157537B (en) * 2014-09-02 2017-04-12 安徽华东光电技术研究所 Slow-wave structure with multiple sets of parallel spiral lines
CN111029229B (en) * 2019-11-26 2022-06-21 南京三乐集团有限公司 Boron nitride clamping rod degassing device and method for traveling wave tube

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3406051A1 (en) * 1984-02-20 1985-08-22 Siemens AG, 1000 Berlin und 8000 München Delay line for travelling-wave tubes and method for the production thereof

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7638159U1 (en) * 1976-12-06 1977-06-16 Siemens Ag, 1000 Berlin Und 8000 Muenchen TROPICAL TUBE WITH A COIL-LIKE DELAY LINE
FR2454694A1 (en) * 1979-04-20 1980-11-14 Thomson Csf PROGRESSIVE WAVE TUBE HAVING VARIABLE GEOMETRY DELAY LINE SUPPORTS
FR2532109A1 (en) * 1982-08-20 1984-02-24 Thomson Csf PROGRESSIVE WAVE TUBE HAVING MEANS FOR SUPPRESSING PARASITE OSCILLATIONS
GB2141370B (en) * 1983-06-17 1987-02-04 Standard Telephones Cables Ltd Bonding metal to ceramic
US5038076A (en) * 1989-05-04 1991-08-06 Raytheon Company Slow wave delay line structure having support rods coated by a dielectric material to prevent rod charging

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3406051A1 (en) * 1984-02-20 1985-08-22 Siemens AG, 1000 Berlin und 8000 München Delay line for travelling-wave tubes and method for the production thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Conf. Proc. Microwaves 1986, 24-26 juin 1986, Brighton, GB. Microwave exhibitions and publishers Ltd, GB. pages 360-365. H.J. SLOLEY et al.: "High power, high frequency helix TWT's." *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0534762A1 (en) * 1991-09-27 1993-03-31 Nec Corporation Dielectric support rod for a traveling-wave tube

Also Published As

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US5071055A (en) 1991-12-10
FR2629634A1 (en) 1989-10-06
FR2629634B1 (en) 1990-10-12
EP0402549B1 (en) 1994-06-08

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