GB918732A - Magnetic-focusing systems for travelling-wave tubes - Google Patents

Magnetic-focusing systems for travelling-wave tubes

Info

Publication number
GB918732A
GB918732A GB2914158A GB2914158A GB918732A GB 918732 A GB918732 A GB 918732A GB 2914158 A GB2914158 A GB 2914158A GB 2914158 A GB2914158 A GB 2914158A GB 918732 A GB918732 A GB 918732A
Authority
GB
United Kingdom
Prior art keywords
magnetic
permanent magnet
travelling
polepiece
produce
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
GB2914158A
Inventor
Bernard Thomas Murphy
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.)
Philips Components Ltd
Original Assignee
Mullard Ltd
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 Mullard Ltd filed Critical Mullard Ltd
Priority to GB2914158A priority Critical patent/GB918732A/en
Publication of GB918732A publication Critical patent/GB918732A/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

Landscapes

  • Microwave Tubes (AREA)

Abstract

918,732. Travelling-wave tubes. MULLARD Ltd. June 11, 1959 [Sept. 11, 1958], No. 29141/58. Class 39 (1). A magnetic focusing system for a travelling- wave tube comprises first permanent magnet means 1, 7 to produce a first uniform magnetic field and a second permanent magnet means 8 to produce a field adjacent the electron gun which converges and then diverges and a magnetic screen 9 arranged between the first and second magnet means to prevent interaction between the two magnetic fields. The permanent magnets 1, 7, 8 are two or more bar magnets evenly spaced around the tube. 1 and 7 are combined with further magnets not shown to produce a uniform field e.g. as in Specification 818,731. Permanent magnet 1 has a polepiece 3 and permanent magnet 8 a polepiece 10; the gun is in a higher magnetic field than is the delay line. The steel screen 9 serves also as a polepiece and may be movable axially or may be replaced by screens of different aperture sizes to alter the magnetic field distribution in the gun.
GB2914158A 1958-09-11 1958-09-11 Magnetic-focusing systems for travelling-wave tubes Expired GB918732A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2914158A GB918732A (en) 1958-09-11 1958-09-11 Magnetic-focusing systems for travelling-wave tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2914158A GB918732A (en) 1958-09-11 1958-09-11 Magnetic-focusing systems for travelling-wave tubes

Publications (1)

Publication Number Publication Date
GB918732A true GB918732A (en) 1963-02-20

Family

ID=10286797

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2914158A Expired GB918732A (en) 1958-09-11 1958-09-11 Magnetic-focusing systems for travelling-wave tubes

Country Status (1)

Country Link
GB (1) GB918732A (en)

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