GB1049875A - Improvements in or relating to focussing arrangements for electron beam tubes - Google Patents

Improvements in or relating to focussing arrangements for electron beam tubes

Info

Publication number
GB1049875A
GB1049875A GB25142/63A GB2514263A GB1049875A GB 1049875 A GB1049875 A GB 1049875A GB 25142/63 A GB25142/63 A GB 25142/63A GB 2514263 A GB2514263 A GB 2514263A GB 1049875 A GB1049875 A GB 1049875A
Authority
GB
United Kingdom
Prior art keywords
field
focusing
distortion
scallop
brillouin
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
GB25142/63A
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB1049875A publication Critical patent/GB1049875A/en
Expired legal-status Critical Current

Links

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
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/08—Focusing arrangements, e.g. for concentrating stream of electrons, for preventing spreading of stream
    • H01J23/087—Magnetic focusing arrangements
    • H01J23/0873—Magnetic focusing arrangements with at least one axial-field reversal along the interaction space, e.g. P.P.M. focusing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/02—Details
    • H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement, ion-optical arrangement
    • H01J37/10—Lenses
    • H01J37/14—Lenses magnetic

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Microwave Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Radiation-Therapy Devices (AREA)

Abstract

1,049,875. Travelling wave tubes. WESTERN ELECTRIC CO. Inc. June 25, 1963 [July 3, 1962], No.25142/63. Heading H1D. A travelling wave tube has a magnetically shielded cathode and an electron gun for producing a converging electron beam, the resulting electron beam being focused by a magnetic field which has a strength higher than that required for Brillouin focusing whereby the beam is caused to commence to scallop, the focusing field being distorted to produce an imbalance of the forces governing the flow of the beam so as to produce a cancellation of the scalloping effect of the focusing field. The focusing field is five or six times larger than that required for Brillouin flow at the point of entry of the beam into the focusing field, and the distortion of the focusing field is at a point from the place of entry of the beam into the focusing field e.g. between “ and ¢ of a scallop wavelength such that the beam is compressed to the Brillouin diameter corresponding to the focusing field. The field distortion is a decrease in the strength of the magnetic field over a distance of up to ¢ a scallop wavelength. The focusing field is preferably produced by a period permanent magnet system, and the magnet field distortion is produced at every field reversal to eliminate scalloping, the field being distorted both before and after each field reversal. The field distortion is produced by a ring of magnetic material.
GB25142/63A 1962-07-03 1963-06-25 Improvements in or relating to focussing arrangements for electron beam tubes Expired GB1049875A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US207294A US3265925A (en) 1962-07-03 1962-07-03 Field perturbing means for preventing beam scalloping in reversed field focusing system

Publications (1)

Publication Number Publication Date
GB1049875A true GB1049875A (en) 1966-11-30

Family

ID=22769935

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25142/63A Expired GB1049875A (en) 1962-07-03 1963-06-25 Improvements in or relating to focussing arrangements for electron beam tubes

Country Status (5)

Country Link
US (1) US3265925A (en)
DE (1) DE1491540A1 (en)
FR (1) FR1365620A (en)
GB (1) GB1049875A (en)
SE (1) SE301193B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2152742A (en) * 1980-04-28 1985-08-07 Emi Varian Ltd Microwave amplifiers and oscillators

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3396299A (en) * 1964-06-15 1968-08-06 Jeol Ltd Magnetic flux leakage guide for magnetic electron lenses
DE1541036B1 (en) * 1966-04-26 1970-08-06 Siemens Ag System for generating a hollow electron beam for travel-time tubes, especially high-power traveling wave tubes
US3614516A (en) * 1970-03-13 1971-10-19 Varian Associates Electron tubes employing a hollow magnetron injected beam and magnetic field reversal focusing
FR2591031A1 (en) * 1985-11-29 1987-06-05 Thomson Csf Focuser for electron beam and travelling-wave tube equipped with such a focuser
US7666293B2 (en) * 2007-10-04 2010-02-23 Dow Agrosciences Llc Electrochemical reduction of halogenated 4-aminopicolinic acids

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2707758A (en) * 1950-12-19 1955-05-03 Sperry Corp Travelling wave tube
DE1071237B (en) * 1953-04-29
BE534618A (en) * 1954-01-04
US2817035A (en) * 1954-04-26 1957-12-17 Hughes Aircraft Co Brillouin flow electron gun
US2956198A (en) * 1955-06-10 1960-10-11 Bell Telephone Labor Inc Traveling wave tubes
NL250365A (en) * 1959-04-10
US3020440A (en) * 1959-06-25 1962-02-06 Rca Corp Electron beam device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2152742A (en) * 1980-04-28 1985-08-07 Emi Varian Ltd Microwave amplifiers and oscillators

Also Published As

Publication number Publication date
DE1491540B2 (en) 1970-09-10
SE301193B (en) 1968-05-27
US3265925A (en) 1966-08-09
FR1365620A (en) 1964-07-03
DE1491540A1 (en) 1969-02-20

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