GB729676A - Electromagnetic wave generator - Google Patents
Electromagnetic wave generatorInfo
- Publication number
- GB729676A GB729676A GB718/53A GB71853A GB729676A GB 729676 A GB729676 A GB 729676A GB 718/53 A GB718/53 A GB 718/53A GB 71853 A GB71853 A GB 71853A GB 729676 A GB729676 A GB 729676A
- Authority
- GB
- United Kingdom
- Prior art keywords
- waveguide
- frequency
- electrodes
- magnetic field
- electrons
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
- H01J25/34—Travelling-wave tubes; Tubes in which a travelling wave is simulated at spaced gaps
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
- H01J25/005—Gas-filled transit-time tubes
Landscapes
- Microwave Tubes (AREA)
- Electron Sources, Ion Sources (AREA)
Abstract
729,676. High-frequency discharge apparatus. STANDARD TELEPHONES & CABLES, Ltd. Jan. 9, 1953 [Feb. 5, 1952], No. 718/53. Class 39 (1). [Also in Group XL (b)] An electromagnetic generator of millimetre waves comprises a section of hollow waveguide or a hollow resonator, shaped to sustain standing electromagnetic waves having a given mode of oscillation, means for providing within the guide or resonator a unidirectional magnetic field perpendicular to the electric vector in the said mode, means for causing electrons to travel in the said guide or resonator in the same or opposite direction to the said magnetic field with a superimposed angular motion and at a density such that the plasma frequency of the said electrons lies within the band of frequencies transmitted or sustained, respectively, by the waveguide or resonator, and means for extracting the electromagnetic wave energy generated by oscillation of the said electrons at the said plasma frequency. In one embodiment, Fig. 1, a permanent magnet 2, or alternatively an electromagnet, establishes a substantially uniform unidirectional magnetic field across a rectangular waveguide section 1 closed at one end 1a. An electric discharge is established between electrodes 3 and 4 which are mounted in the walls of the waveguide and insulated therefrom at 3a and 4a. Alternatively, if suitable windows are provided in the waveguide walls, the electrodes may be part of the pole faces 2a and 2b of the magnet, in which case an alternating voltage must be applied to excite the discharge. The centres of the electrodes 3 and 4 may be one or an odd multiple of quarter wavelengths from the closed end 1a of the waveguide or may be other distances therefrom for loadmatching purposes. The interaction volume, i.e. the portion of waveguide 1 between the magnet pole faces 2a and 2b, is sealed off by walls 5 and 6 of dielectric material such as glass and is filled with a gas such as helium or a mixture of neon and argon at a pressure in the range of 10-<SP>3</SP> to 10 mm. of mercury. The discharge between the electrodes 3 and 4 establishes a dense plasma, the electrons of which tend to oscillate at the plasma frequency fp, and due to the presence of the magnetic field oscillate also at the gyromagnetic frequency fH. When the frequency fH as determined by the intensity of the magnetic field is substantially equal to the plasma frequency fp, the electron oscillations are exceptionally strong and electromagnetic energy at substantially the gyromagnetic frequency and harmonics thereof is radiated into the wave-guide portion 1b to which further waveguide sections and filters can be added to select the desired frequency. To ensure that electrons traversing the wave-guide between electrodes 3 and 4 will not just follow a straight line path but will have some component of oscillating angular motion, auxiliary electrodes 7 and 8 may be provided to create an electric field perpendicular to the electron path and the magnetic lines of force. In this case a strong output is obtained, whether or not there is resonance between fp and fH, and the gas filling may be omitted and an electron-emissive cathode utilized to provide an electron beam in vacuum between electrodes 3 and 4. The energy radiated into the wave-guide section 1b may be termed an " end-fire " radiation, and in cases where the " broadside." radiation is the greater a modified apparatus may be utilized, in which the section of waveguide comprising the interaction volume is arranged at an angle to the lines of force of the magnetic field. The electrodes 3 and 4 are arranged at an acute angle to the longitudinal axis of the waveguide so that the electric field is still parallel to the magnetic field. Fig. 3 shows a vacuum tube arrangement in which a cylindrical cavity section 15 is surrounded by an electromagnet 16 having end plates 17 and 18 of high permeability material. A beam of electrons formed by a cathode 19 and focusing electrode 20 is projected through an aperture 22 in the plate 17 across the cavity 15 to an anode 23 insulated from end plate 18 by a dielectric ring 24. Auxiliary electrodes 27 and 28 provide a D.C. electric field transverse to the electron beam. Strong electromagnetic waves produced at resonance of the gyromagnetic frequency with the R.F. cavity frequency are coupled to a load by the loop 29. In an alternative arrangement a negative potential is applied to the electrode 23 which then forms a repeller electrode and repels the electron stream from cathode 19 so that an electron cloud is formed in the cavity 15.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US270034A US2817045A (en) | 1952-02-05 | 1952-02-05 | Electromagnetic wave generator |
Publications (1)
Publication Number | Publication Date |
---|---|
GB729676A true GB729676A (en) | 1955-05-11 |
Family
ID=23029609
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB718/53A Expired GB729676A (en) | 1952-02-05 | 1953-01-09 | Electromagnetic wave generator |
Country Status (5)
Country | Link |
---|---|
US (1) | US2817045A (en) |
CH (1) | CH324917A (en) |
DE (1) | DE1003287B (en) |
GB (1) | GB729676A (en) |
NL (1) | NL175254B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3944946A (en) * | 1974-11-15 | 1976-03-16 | Balram Prasad | Coherent generation of microwaves by stimulated Raman emissions |
RU180427U1 (en) * | 2018-01-10 | 2018-06-13 | Николай Владиславович Аржанов | The resonator cover of the installation for radiation processing of products and materials |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2955262A (en) * | 1957-12-10 | 1960-10-04 | Itt | Gas cell for frequency selective system |
NL260047A (en) * | 1961-01-13 | |||
DE1150717B (en) * | 1961-06-29 | 1963-06-27 | Max Planck Gesellschaft | Arrangement for generating high-frequency electromagnetic oscillations, preferably in the millimeter and sub-millimeter wave range, by means of a Penning-type gas discharge |
GB1020224A (en) * | 1962-01-22 | 1966-02-16 | Hitachi Ltd | Improvements relating to an electron cyclotron resonance ultra-violet lamp |
US3270244A (en) * | 1963-01-29 | 1966-08-30 | Nippon Electric Co | Micro-wave amplifier utilizing the interaction between an electron beam and a plasma stream |
GB1034645A (en) * | 1963-02-08 | 1966-06-29 | Nat Res Dev | Improvements in high frequency electrical oscillation generators |
US3418206A (en) * | 1963-04-29 | 1968-12-24 | Boeing Co | Particle accelerator |
US3363138A (en) * | 1964-11-04 | 1968-01-09 | Sperry Rand Corp | Electron beam-plasma device operating at multiple harmonics of beam cyclotron frequency |
US3311852A (en) * | 1964-11-12 | 1967-03-28 | Giller Morris | High frequency externally pulsed switch tube |
US3432722A (en) * | 1966-01-17 | 1969-03-11 | Gen Electric | Electromagnetic wave generating and translating apparatus |
US3432721A (en) * | 1966-01-17 | 1969-03-11 | Gen Electric | Beam plasma high frequency wave generating system |
US3439297A (en) * | 1966-10-24 | 1969-04-15 | Hughes Aircraft Co | Plasma variable reactance device phase shifter |
US3439224A (en) * | 1966-10-24 | 1969-04-15 | Hughes Aircraft Co | Electron injection plasma variable reactance device |
US3439223A (en) * | 1966-10-24 | 1969-04-15 | Hughes Aircraft Co | Electron injection plasma variable reactance device |
US3439225A (en) * | 1966-10-24 | 1969-04-15 | Hughes Aircraft Co | Electron injection plasma variable reactance device with perforated anode in the electron path |
CN109860010B (en) * | 2019-01-28 | 2020-11-17 | 西北核技术研究所 | Method for applying local electric field to inhibit radial oscillation of electron beam |
FR3092818B1 (en) * | 2019-02-14 | 2022-02-25 | Airbus Operations Sas | Aerodynamic element equipped with a transverse air flow control system |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2233263A (en) * | 1938-11-30 | 1941-02-25 | Rca Corp | Resonant cavity oscillator |
FR859753A (en) * | 1939-05-26 | 1940-12-28 | Le Materiel Telephonique Sa | High frequency electromagnetic wave transmission system |
FR875224A (en) * | 1941-05-09 | 1942-09-11 | Csf | Improvements to generators, amplifiers, transformers or receivers of ultra-short waves guided in a dielectric medium |
NL143293B (en) * | 1946-08-16 | Dow Corning | METHOD FOR THE POST-TREATMENT OF A PIGMENTED GLASS FIBER PRODUCT. | |
FR946147A (en) * | 1947-04-21 | 1949-05-24 | Cherifienne D Outil Et De Mate | Further development of dryer oven rollers |
US2591350A (en) * | 1947-04-26 | 1952-04-01 | Raytheon Mfg Co | Traveling-wave electron reaction device |
US2579654A (en) * | 1947-06-04 | 1951-12-25 | Raytheon Mfg Co | Electron-discharge device for microwave amplification |
US2558664A (en) * | 1948-05-15 | 1951-06-26 | Sylvania Electric Prod | Switch tube |
US2602908A (en) * | 1949-04-29 | 1952-07-08 | Rca Corp | Apparatus for utilizing cumulative ionization |
-
0
- NL NLAANVRAGE7108572,A patent/NL175254B/en unknown
-
1952
- 1952-02-05 US US270034A patent/US2817045A/en not_active Expired - Lifetime
-
1953
- 1953-01-09 GB GB718/53A patent/GB729676A/en not_active Expired
- 1953-01-28 DE DEI6846A patent/DE1003287B/en active Pending
- 1953-02-04 CH CH324917D patent/CH324917A/en unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3944946A (en) * | 1974-11-15 | 1976-03-16 | Balram Prasad | Coherent generation of microwaves by stimulated Raman emissions |
RU180427U1 (en) * | 2018-01-10 | 2018-06-13 | Николай Владиславович Аржанов | The resonator cover of the installation for radiation processing of products and materials |
Also Published As
Publication number | Publication date |
---|---|
CH324917A (en) | 1957-10-15 |
NL175254B (en) | |
DE1003287B (en) | 1957-02-28 |
US2817045A (en) | 1957-12-17 |
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