GB1350269A - Velocity-modulation tubes - Google Patents
Velocity-modulation tubesInfo
- Publication number
- GB1350269A GB1350269A GB2708871*A GB2708871A GB1350269A GB 1350269 A GB1350269 A GB 1350269A GB 2708871 A GB2708871 A GB 2708871A GB 1350269 A GB1350269 A GB 1350269A
- Authority
- GB
- United Kingdom
- Prior art keywords
- drift
- degrees
- velocity
- buncher
- cavities
- 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
- H01J25/02—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
- H01J25/10—Klystrons, i.e. tubes having two or more resonators, without reflection of the electron stream, and in which the stream is modulated mainly by velocity in the zone of the input resonator
Abstract
1350269 Velocity-modulated tubes VARIAN ASSOCIATES 19 April 1971 [15 April 1970] 27088/71 Heading H1D In a velocity-modulated tube-as described, a klystron or extended-interaction klystronthe beam of electrons projected from a gun to a collection passes in succession through a prebuncher resonant circuit, through a nextsucceeding floating buncher resonant circuit, and through output circuit means for excitation by the modulated beam, the drift tube interposed between the pre-buncher and floating buncher circuits providing a drift region corresponding to a reduced plasma angle # greater than 90 degrees, and preferably equal to 120 degrees, where wq is the reduced plasma frequency, Vo is the D.C. beam velocity, and I is the length of the drift space. It is shown that the space charge forces arising from the fundamental and second harmonic space charge waves reinforce one another in the vicinity of the centre of the electron bunches, but oppose one another in the inter-bunch regions, whereby the provision of an abnormally long drift space provides a period for continued drift of electrons towards the bunches before excessive degradation of the bunching within the bunches occurs. For the klystron shown, the pre-buncher cavity 5 is also the input cavity, and the reduced plasma angles corresponding to the drift lengths between the interaction gaps of cavities 5 and 11, 11 and 11<SP>1</SP>, and 11<SP>1</SP> and 13, are 120 degrees, 60 degrees, and 25 degrees, respectively. Alternatively, the prebuncher cavity 5 may be replaced by a plurality of cavities (e.g. 3, Fig. 7, not shown) to increase gain, the upstream one being the input cavity, the drift lengths between the cavities each corresponding to a reduced plasma angle of 60 degrees, and the different cavities being tuned to different fundamental frequencies in the vicinity of the pass-band of the tube, to broaden the latter. The velocity-modulated tube may alternatively be an extended-interaction klystron having single or cross-wound helix resonators.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US2879270A | 1970-04-15 | 1970-04-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1350269A true GB1350269A (en) | 1974-04-18 |
Family
ID=21845457
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2708871*A Expired GB1350269A (en) | 1970-04-15 | 1971-04-19 | Velocity-modulation tubes |
Country Status (7)
Country | Link |
---|---|
US (1) | US3622834A (en) |
JP (1) | JPS5330985B1 (en) |
CA (1) | CA956387A (en) |
DE (1) | DE2117924C3 (en) |
FR (1) | FR2089691A5 (en) |
GB (1) | GB1350269A (en) |
NL (1) | NL174599C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0268405A2 (en) * | 1986-11-19 | 1988-05-25 | Varian Associates, Inc. | High-efficiency broad-band klystron |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2153585A5 (en) * | 1971-09-16 | 1973-05-04 | Thomson Csf | |
JPS533225B2 (en) * | 1972-04-18 | 1978-02-04 | ||
FR2191253B1 (en) * | 1972-06-27 | 1978-03-03 | Thomson Csf | |
US3942066A (en) * | 1972-10-25 | 1976-03-02 | Nippon Electric Company Limited | Velocity modulation tube including a high resonance-frequency floating prebuncher having a q-value lower than a low resonance-frequency input cavity |
JPS535110B2 (en) * | 1972-10-25 | 1978-02-23 | ||
JPS5169355A (en) * | 1974-12-06 | 1976-06-15 | Nippon Electric Co | Kokoritsu 4 kudosokudohenchokan |
JPS51115768A (en) * | 1975-04-03 | 1976-10-12 | Nec Corp | Wide-band speed modurated tube |
GB1506949A (en) * | 1975-12-13 | 1978-04-12 | English Electric Valve Co Ltd | Velocity modulation tubes |
US4168451A (en) * | 1977-07-01 | 1979-09-18 | Nippon Electric Co., Ltd. | Multi-cavity klystron amplifiers |
DE2963493D1 (en) * | 1978-09-06 | 1982-09-30 | Emi Varian Ltd | An output section for a microwave amplifier, a microwave amplifier and a circuit for use in a microwave amplifier |
US4800322A (en) * | 1984-10-23 | 1989-01-24 | Litton Systems, Inc. | Broadband klystron cavity arrangement |
US5142250A (en) * | 1992-01-14 | 1992-08-25 | The United States Of America As Represented By The Secretary Of The Navy | High power microwave generator |
US5521551A (en) * | 1994-11-21 | 1996-05-28 | Ferguson; Patrick E. | Method for suppressing second and higher harmonic power generation in klystrons |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2591910A (en) * | 1945-09-10 | 1952-04-08 | Emi Ltd | Electron discharge amplifier device employing hollow resonator |
US2494721A (en) * | 1947-06-18 | 1950-01-17 | Bell Telephone Labor Inc | Electron velocity variation device with noise reducing resonator |
US2579480A (en) * | 1947-08-26 | 1951-12-25 | Sperry Corp | Ultrahigh-frequency electron discharge apparatus |
US2605444A (en) * | 1948-08-17 | 1952-07-29 | Westinghouse Electric Corp | Multichannel frequency selector and amplifier |
US3195007A (en) * | 1960-10-28 | 1965-07-13 | Litton Prec Products Inc | Stagger-tuned klystron with cavities resonant outside passband |
-
1970
- 1970-04-15 US US28792A patent/US3622834A/en not_active Expired - Lifetime
-
1971
- 1971-04-14 DE DE2117924A patent/DE2117924C3/en not_active Expired
- 1971-04-14 CA CA110,289A patent/CA956387A/en not_active Expired
- 1971-04-14 NL NLAANVRAGE7104993,A patent/NL174599C/en not_active IP Right Cessation
- 1971-04-15 FR FR7113293A patent/FR2089691A5/fr not_active Expired
- 1971-04-15 JP JP2422171A patent/JPS5330985B1/ja active Pending
- 1971-04-19 GB GB2708871*A patent/GB1350269A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0268405A2 (en) * | 1986-11-19 | 1988-05-25 | Varian Associates, Inc. | High-efficiency broad-band klystron |
EP0268405A3 (en) * | 1986-11-19 | 1988-07-13 | Varian Associates, Inc. | High-efficiency broad-band klystron |
Also Published As
Publication number | Publication date |
---|---|
JPS5330985B1 (en) | 1978-08-30 |
NL7104993A (en) | 1971-10-19 |
CA956387A (en) | 1974-10-15 |
DE2117924B2 (en) | 1977-12-08 |
DE2117924C3 (en) | 1978-07-20 |
DE2117924A1 (en) | 1971-10-28 |
FR2089691A5 (en) | 1972-01-07 |
NL174599C (en) | 1984-07-02 |
US3622834A (en) | 1971-11-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PLE | Entries relating assignments, transmissions, licences in the register of patents | ||
PCNP | Patent ceased through non-payment of renewal fee |