GB885251A - Improvements in permanent magnet systems - Google Patents

Improvements in permanent magnet systems

Info

Publication number
GB885251A
GB885251A GB15305/58A GB1530558A GB885251A GB 885251 A GB885251 A GB 885251A GB 15305/58 A GB15305/58 A GB 15305/58A GB 1530558 A GB1530558 A GB 1530558A GB 885251 A GB885251 A GB 885251A
Authority
GB
United Kingdom
Prior art keywords
magnets
flux
pole pieces
series
permanent magnet
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
GB15305/58A
Inventor
Brian William Manley
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 GB15305/58A priority Critical patent/GB885251A/en
Priority to US805515A priority patent/US3021458A/en
Publication of GB885251A publication Critical patent/GB885251A/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
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/58—Arrangements for focusing or reflecting ray or beam
    • H01J29/64—Magnetic lenses
    • H01J29/68—Magnetic lenses using permanent magnets only
    • 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 or ion-optical arrangement
    • H01J37/10—Lenses
    • H01J37/14—Lenses magnetic
    • H01J37/143—Permanent magnetic lenses

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Particle Accelerators (AREA)

Abstract

885,251. Permanent magnets. MULLARD Ltd. May 13, 1958, No. 15305/58. Class 35. [Also in Group XL (a)] A permanent magnet system for focusing a beam of charged particles eg. in a klystron or travelling-wave tube, comprises a series of magnets 1 coaxial with the common longitudinal axis of the system, associated with a series of apertured pole pieces the aperture boundaries of which are surfaces of revolution about the common axis and the parts being so shaped and arranged that a substantially uniform flux is established along the common axis, the direction of this flux being reversed in adjacent regions (Fig. 3, not shown) and the magnets being secured in position by supports which provide an external flux path. The magnets are cylindrical or frusto-conical shells, the inner pole pieces 2 being apertured discs, and the outer pole pieces 3 each having an inner coaxial cylindrical extension and a peripheral extension 5 carrying clamping bolts 6 which complete the outer magnetic circuit. The three adjacent axial air gaps 8, 9 and 10 thus formed are dimensioned to provide a uniform field. A coil 7, which may be in sections, may be provided for fine adjustment of flux.
GB15305/58A 1958-05-13 1958-05-13 Improvements in permanent magnet systems Expired GB885251A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB15305/58A GB885251A (en) 1958-05-13 1958-05-13 Improvements in permanent magnet systems
US805515A US3021458A (en) 1958-05-13 1959-04-10 Permanent magnet systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB15305/58A GB885251A (en) 1958-05-13 1958-05-13 Improvements in permanent magnet systems

Publications (1)

Publication Number Publication Date
GB885251A true GB885251A (en) 1961-12-20

Family

ID=10056725

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15305/58A Expired GB885251A (en) 1958-05-13 1958-05-13 Improvements in permanent magnet systems

Country Status (2)

Country Link
US (1) US3021458A (en)
GB (1) GB885251A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3022649A1 (en) * 1980-06-18 1982-03-11 Leonard Dipl.-Ing. 4000 Düsseldorf Colin Magneto:hydrostatic levitation - using non:homogeneous magnetic field with axial symmetry for producing non:linear trajectories

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109786189B (en) * 2018-12-30 2021-04-02 中国电子科技集团公司第十二研究所 Klystron permanent magnetism focusing system
CN109860004B (en) * 2018-12-30 2021-02-02 中国电子科技集团公司第十二研究所 Microwave tube permanent magnet focusing system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2940020A (en) * 1952-04-08 1960-06-07 Int Standard Electric Corp Focusing magnet for long electron beams
US2797360A (en) * 1953-03-26 1957-06-25 Int Standard Electric Corp Travelling wave amplifiers
NL86361C (en) * 1954-12-04

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3022649A1 (en) * 1980-06-18 1982-03-11 Leonard Dipl.-Ing. 4000 Düsseldorf Colin Magneto:hydrostatic levitation - using non:homogeneous magnetic field with axial symmetry for producing non:linear trajectories

Also Published As

Publication number Publication date
US3021458A (en) 1962-02-13

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