GB816411A - Improvements in and relating to travelling wave tubes - Google Patents

Improvements in and relating to travelling wave tubes

Info

Publication number
GB816411A
GB816411A GB13232/57A GB1323257A GB816411A GB 816411 A GB816411 A GB 816411A GB 13232/57 A GB13232/57 A GB 13232/57A GB 1323257 A GB1323257 A GB 1323257A GB 816411 A GB816411 A GB 816411A
Authority
GB
United Kingdom
Prior art keywords
delay line
cathode
fingers
spacing
constant
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
Application number
GB13232/57A
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
CSF Compagnie Generale de Telegraphie sans Fil SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by CSF Compagnie Generale de Telegraphie sans Fil SA filed Critical CSF Compagnie Generale de Telegraphie sans Fil SA
Publication of GB816411A publication Critical patent/GB816411A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/16Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
    • H01J23/24Slow-wave structures, e.g. delay systems
    • H01J23/26Helical slow-wave structures; Adjustment therefor
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/16Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
    • H01J23/24Slow-wave structures, e.g. delay systems
    • H01J23/28Interdigital slow-wave structures; Adjustment therefor
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/34Travelling-wave tubes; Tubes in which a travelling wave is simulated at spaced gaps
    • H01J25/42Tubes in which an electron stream interacts with a wave travelling along a delay line or equivalent sequence of impedance elements, and with a magnet system producing an H-field crossing the E-field
    • H01J25/46Tubes in which an electron stream interacts with a wave travelling along a delay line or equivalent sequence of impedance elements, and with a magnet system producing an H-field crossing the E-field the backward travelling wave being utilised

Landscapes

  • Microwave Tubes (AREA)
  • Microwave Amplifiers (AREA)

Abstract

816,411. Backward wave oscillator tubes. COMPAGNIE GENERALE DE TELEGRAPHIE SANS FIL. April 25, 1957 [April 25, 1956], No. 13232/57. Class 39(1). In a backward wave oscillator operating in a spatial harmonic mode having a sole electrode opposite a delay line, the length of the delay line elements perpendicular to the surface of the sole electrode gradually decreases from the cathode end towards an intermediate element of the delay line all the delay line elements being spaced from the sole electrode by the same amount. In this way the "coupling resistance between beam and delay line is made less at the end of the delay line adjacent the cathode than at an intermediate region thereof. The object is to reduce the heating of the delay line by electron bombardment. This is achieved by making the coupling resistance lower at the end adjacent the cathode as aforesaid, since this requires the coupling between beam and wave to be greater at this portion so that the delay line fingers are made larger and can dissipate more heat caused by electrons bombardment and can carry more high frequency power to the output. As shown in Fig. 1 the length of the the fingers gradually decreases from the cathode end to the centre and then increases again for the second half of the delay line. The beam is most likely to bombard the initial part of the delay line to the fingers in this part are essentially made longer than the others. The distance of the sole plate from the delay line fingers is made constant over the whole length of the delay line, and the delay line, preferably interdigilated as shown in Fig. 1, is of constant pitch. In Fig. 1 the interdigitated delay line is made up of two combs fixed to the inner surface of the envelope which forms the delay line base. The sole plate 21 is supported by three ceramic rods 22, 23, 24 soldered or brazed to one tube end cap. The delay unit envelope spacing may be constant or the envelope can be concentric with the inner delay line surface but eccentric to the outer delay line surface so that the spacing delay line-envelope is greater at the centre of the delay line than at its ends ; in the latter case the delay line is obtained by milling a cylinder whose outer and inner surfaces have parallel but non-coincident axes. 12, 13 and a permanent or electromagnet forms the beam, 12 being the webvelt electrode. The part of the delay line between 16 and 17 has a lossy coating or other internal or external loss means. In another embodiment Fig. 3 the delay line is a comb or ladder supported at one or both ends respectively by lateral walls secured to base 81. The diameter of the delay line rods 82 ... 87 decreases progressively from the cathode towards the centre portion of the line and then increases again to the collector and the dimensions and spacing are such that the ratio of the capacities from each rod to the next are constant along the delay line, the spacing from the rods to the sole plate being constant. The tube of Fig. 3 is linear but may be circular and conversely the tube of Fig. 1 may be linear instead of circular. Specification 699,893 is referred to.
GB13232/57A 1956-04-25 1957-04-25 Improvements in and relating to travelling wave tubes Expired GB816411A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1150045T 1956-04-25

Publications (1)

Publication Number Publication Date
GB816411A true GB816411A (en) 1959-07-15

Family

ID=37682733

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13232/57A Expired GB816411A (en) 1956-04-25 1957-04-25 Improvements in and relating to travelling wave tubes

Country Status (5)

Country Link
US (1) US2982879A (en)
DE (1) DE1096507B (en)
FR (1) FR1150045A (en)
GB (1) GB816411A (en)
NL (1) NL97685C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3069594A (en) * 1959-11-27 1962-12-18 Bell Telephone Labor Inc Electron discharge devices

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3345586A (en) * 1962-09-10 1967-10-03 Sylvania Electric Prod Delay structure for traveling wave device

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT454375A (en) * 1948-07-20
FR969886A (en) * 1948-07-23 1950-12-27 Csf Progressing wave tubes improvements
US2643353A (en) * 1948-11-04 1953-06-23 Int Standard Electric Corp Traveling wave tube
FR984020A (en) * 1949-02-04 1951-07-02 Csf Transverse magnetic field wave propagation tube whose critical value is variable along the delay line
US2681427A (en) * 1949-04-23 1954-06-15 Raytheon Mfg Co Microwave amplifier
US2719936A (en) * 1949-09-14 1955-10-04 Rca Corp Electron tubes of the traveling wave type
FR998819A (en) * 1949-10-14 1952-01-23 Csf Improvements in the coupling of linear wave propagation tubes with their input and output circuits
US2708236A (en) * 1950-03-18 1955-05-10 Bell Telephone Labor Inc Microwave amplifiers
DE841311C (en) * 1950-05-06 1952-06-13 Telefunken Gmbh Moving field pipes with a helix distanced from the vessel wall
US2760102A (en) * 1950-06-09 1956-08-21 Univ Leland Stanford Junior Travelling wave tubes
NL173043B (en) * 1951-07-11 Weimar Nv TRANSPORT EQUIPMENT, IN PARTICULAR FOR THE LOADING AND / OR UNLOADING OF VESSELS.
US2895071A (en) * 1952-12-23 1959-07-14 Bell Telephone Labor Inc Traveling wave tube
GB751353A (en) * 1953-04-14 1956-06-27 Vickers Electrical Co Ltd Improvements relating to linear accelerators for charged particles
US2850704A (en) * 1955-02-04 1958-09-02 Hughes Aircraft Co Waveguide coupling
US2851630A (en) * 1955-04-13 1958-09-09 Hughes Aircraft Co High power traveling-wave tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3069594A (en) * 1959-11-27 1962-12-18 Bell Telephone Labor Inc Electron discharge devices

Also Published As

Publication number Publication date
NL97685C (en) 1961-04-17
US2982879A (en) 1961-05-02
FR1150045A (en) 1958-01-06
DE1096507B (en) 1961-01-05

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