EP0119902A1 - Mikrowellenhohlraumresonator, besonders für Erzeuger elektromagnetischer Energie - Google Patents

Mikrowellenhohlraumresonator, besonders für Erzeuger elektromagnetischer Energie Download PDF

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Publication number
EP0119902A1
EP0119902A1 EP84400425A EP84400425A EP0119902A1 EP 0119902 A1 EP0119902 A1 EP 0119902A1 EP 84400425 A EP84400425 A EP 84400425A EP 84400425 A EP84400425 A EP 84400425A EP 0119902 A1 EP0119902 A1 EP 0119902A1
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EP
European Patent Office
Prior art keywords
mirror
polygon
resonant cavity
cavity
zones
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
EP84400425A
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English (en)
French (fr)
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EP0119902B1 (de
Inventor
Georges Mourier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Original Assignee
Thomson CSF SA
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Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
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Publication of EP0119902B1 publication Critical patent/EP0119902B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • H01J23/18—Resonators
    • H01J23/20—Cavity resonators; Adjustment or tuning thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/02—Tubes with electron stream modulated in velocity or density in a modulator zone and thereafter giving up energy in an inducing zone, the zones being associated with one or more resonators

Definitions

  • the present invention relates to a resonant cavity for microwaves, more particularly a resonant cavity used in a generator operating at several tens of gigahertz, that is to say, in millimeter and submillimeter waves.
  • generators of this type there are in particular generators in which an electron beam propagates along helical paths while being guided by a uniform magnetic field along the axis of the propeller.
  • the beam passes through a resonant cavity in which the transverse velocity components of the electrons interact with a transverse electric field component of the wave so as to amplify it.
  • the cavities usually used in this type of generator are constituted by cylindrical cavities or with two spherical mirrors whose dimensions are calculated to operate in TE on mode.
  • the aim of the present invention is to provide a resonant cavity making it possible to increase the frequency separation of the electromagnetic modes, namely to eliminate a certain number of parasitic modes.
  • the subject of the present invention is a resonant microwave cavity formed by a surface of revolution characterized in that, in a meridian plane, the surface of revolution forms at least four mirror zones facing each other, positioned so that the center of each mirror zone defines the vertex of a polygon and that the normal to said mirror zone at the center is directed along the corresponding bisector of said polygon.
  • the modes propagating in a resonant cavity can be analyzed as plane waves which are reflected a number of times on the walls of the cavity.
  • the waves propagate according to rays.
  • the resonant cavity 1 consists mainly of two curved annular mirrors 3-4 of the same axis ZZ ', more particularly in the form of a spherical zone.
  • the two mirrors 3, 4 which face each other, are positioned so that, in a meridian plane, they delimit four mirror rods 3a, 3b, 4a, 4b facing each other whose respective centers 3'a, 3'b , 4'a, 4'b form the vertices of a polygon, namely the four vertices of a rectangle in the embodiment shown.
  • the four zones are inclined in the meridian plane so that the normal 5a, 5b, 6a, 6b to the said mirror zones at the level of the centers corresponds to the bisector of the angle at the corresponding vertex of the rectangle.
  • the mirrors are inclined at 45 ° relative to the axis ZZ '.
  • the mirror zones 3a, 3b, 4a, 4b have an appropriate curvature in the plane containing the axis whose purpose is to concentrate the energy at the level of the axis ZZ ' on two cd zones, cf of length limited by a side effect due to diffraction.
  • the cavity is constituted by surfaces 7 absorbing the electromagnetic radiation considered, which avoids the reflection of the diffracted rays outside the cavity.
  • the cavity shown in Figure 1 it has two areas of interaction cd, cf with the beam elcc- tronic. It is thus possible to carry out a premodulation of the electron beam during the first interaction, namely at the level of the cd area, most of the energy transfer from the beam to the wave occurring during the second interaction. , namely at the level of the ef zone.
  • the annular mirrors may be, as shown in FIG. 3, constituted by two asymmetrical annular mirrors 8, 9 having different radii in the meridian plane.
  • the polygon of the centers of the mirror zones 8a, 8b, 9a, 9b is constituted by an isosceles trapezoid.
  • Figure 3 there is shown in the same manner as in Figure 1, the path of the electromagnetic propagation and the areas where the energy is concentrated.
  • the path followed by the electromagnetic waves in the cavity of FIG. 3 is identical to that of FIG. 1, the only difference residing in the fact that the interaction zone cd is more important than the interaction zone ef, which causes a greater concentration of energy in the ef zone.
  • the mirror zones 10, 11, 12, 13 are positioned as shown in FIG. 4.
  • the mirror zones 10, 11, 12, 13 are obtained from four mirrors in a spherical or parabolic cap for example arranged around the axis ZZ 'which remains the axis of symmetry of the electron beam and the magnetic field.
  • Each mirror now has its own axis 10a - 10a ', llb - llb', 12c - 12c ', 13d - 13d' and the polygon having the above axes for bisector is formed by two triangles opposite by the vertex.
  • the radial modes successive correspond to a variation of the phase of 2 when it is counted along a complete course of the ray on itself. It follows that one in two radial modes corresponds to fields in phase opposition in the region of the axis. Thus, only one in two radial modes can interact.
  • the surfaces surrounding the mirrors are constituted by elements absorbing the electromagnetic radiation present or by surfaces covered with an absorbent layer produced for example in "carberlox".
  • the cavities described above are used more particularly in generators of radio waves of the gyrotron type. However, it is obvious to those skilled in the art that these cavities can be used in other applications requiring mode separation.

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  • Particle Accelerators (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Microwave Tubes (AREA)
EP84400425A 1983-03-11 1984-03-02 Mikrowellenhohlraumresonator, besonders für Erzeuger elektromagnetischer Energie Expired EP0119902B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8304056 1983-03-11
FR8304056A FR2542504B1 (fr) 1983-03-11 1983-03-11 Cavite resonnante pour hyperfrequences, en particulier pour generateurs d'energie electromagnetique

Publications (2)

Publication Number Publication Date
EP0119902A1 true EP0119902A1 (de) 1984-09-26
EP0119902B1 EP0119902B1 (de) 1987-10-14

Family

ID=9286781

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84400425A Expired EP0119902B1 (de) 1983-03-11 1984-03-02 Mikrowellenhohlraumresonator, besonders für Erzeuger elektromagnetischer Energie

Country Status (5)

Country Link
US (1) US4661744A (de)
EP (1) EP0119902B1 (de)
JP (1) JPS59175202A (de)
DE (1) DE3466830D1 (de)
FR (1) FR2542504B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4636688A (en) * 1983-09-30 1987-01-13 Kabushiki Kaisha Toshiba Gyrotron device
US4839561A (en) * 1984-12-26 1989-06-13 Kabushiki Kaisha Toshiba Gyrotron device

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2023680B3 (es) * 1987-03-03 1992-02-01 Centre De Rech En Physique Des Plasmas Girotron de alto rendimiento para obtencion de ondas electromagneticas milimetricas o submilimetricas
FR2625836B1 (fr) * 1988-01-13 1996-01-26 Thomson Csf Collecteur d'electrons pour tube electronique
EP0393485A1 (de) * 1989-04-19 1990-10-24 Asea Brown Boveri Ag Quasi-optisches Gyrotron
FR2672730B1 (fr) * 1991-02-12 1993-04-23 Thomson Tubes Electroniques Dispositif convertisseur de modes et diviseur de puissance pour tube hyperfrequence et tube hyperfrequence comprenant un tel dispositif.
CN102956415B (zh) * 2011-08-29 2015-11-04 中国科学院电子学研究所 一种回旋管准光输出系统的反射镜曲面的设计方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE707253C (de) * 1934-05-16 1941-06-17 Julius Pintsch Kom Ges Reflektoranordnung fuer drahtlose Zeichenuebertragung
GB576442A (en) * 1941-01-27 1946-04-04 Harry Melville Dowsett Improvements in radiating systems of electro-magnetic waves

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL128040C (de) * 1960-10-07
US3267383A (en) * 1963-05-27 1966-08-16 Ibm Particle accelerator utilizing coherent light
US3518427A (en) * 1968-06-05 1970-06-30 Atomic Energy Commission Universal planar x-ray resonator
US3688218A (en) * 1971-01-29 1972-08-29 Us Army Stimulated radiation cavity reflector
US3979695A (en) * 1974-12-20 1976-09-07 Honeywell Inc. High order beam mode resonator
SU530606A1 (ru) * 1975-04-04 1980-12-30 Ananev Yu A Неустойчивый резонатор оптического квантовоно генератора
US4179192A (en) * 1976-06-14 1979-12-18 The Perkin-Elmer Corporation Laser fusion optical system
US4189660A (en) * 1978-11-16 1980-02-19 The United States Of America As Represented By The United States Department Of Energy Electron beam collector for a microwave power tube
SU777763A1 (ru) * 1978-12-26 1980-11-07 Днепропетровское Отделение Института Механики Ан Украинской Сср Открытый резонатор
US4287488A (en) * 1979-11-02 1981-09-01 The United States Of America As Represented By The United States Department Of Energy Rf Feedback free electron laser
SU938333A1 (ru) * 1980-10-17 1982-06-23 Ордена Трудового Красного Знамени Институт Радиотехники И Электроники Ан Ссср Генератор СВЧ-колебаний
GB2096392B (en) * 1981-04-06 1985-04-03 Varian Associates Collector-output for hollow beam electron tubes
US4496913A (en) * 1982-11-24 1985-01-29 The United States Of America As Represented By The Secretary Of The Army Millimeter wave power combiner using concave reflectors

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE707253C (de) * 1934-05-16 1941-06-17 Julius Pintsch Kom Ges Reflektoranordnung fuer drahtlose Zeichenuebertragung
GB576442A (en) * 1941-01-27 1946-04-04 Harry Melville Dowsett Improvements in radiating systems of electro-magnetic waves

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. MTT-28, no. 12, décembre 1980, pages 1477-1481, New York, US L.R. BARNETT et al.: "Circular-electric mode waveguide couplers and junctions for use in gyrotron traveling-wave amplifiers" *
PROCEEDINGS OF THE IEEE, vol. 62, no. 11, novembre 1974, pages 1611-1613, New York, US P.F. CHECCACCI et al.: "Ring and 90-degree roof open resonators" *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4636688A (en) * 1983-09-30 1987-01-13 Kabushiki Kaisha Toshiba Gyrotron device
EP0141525A3 (en) * 1983-09-30 1987-10-28 Kabushiki Kaisha Toshiba Gyrotron device
US4839561A (en) * 1984-12-26 1989-06-13 Kabushiki Kaisha Toshiba Gyrotron device

Also Published As

Publication number Publication date
FR2542504A1 (fr) 1984-09-14
JPS59175202A (ja) 1984-10-04
FR2542504B1 (fr) 1986-02-21
DE3466830D1 (en) 1987-11-19
EP0119902B1 (de) 1987-10-14
US4661744A (en) 1987-04-28

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