EP0624893A3 - Dispositifs magnétiques. - Google Patents

Dispositifs magnétiques. Download PDF

Info

Publication number
EP0624893A3
EP0624893A3 EP94302505A EP94302505A EP0624893A3 EP 0624893 A3 EP0624893 A3 EP 0624893A3 EP 94302505 A EP94302505 A EP 94302505A EP 94302505 A EP94302505 A EP 94302505A EP 0624893 A3 EP0624893 A3 EP 0624893A3
Authority
EP
European Patent Office
Prior art keywords
magnet arrangements
arrangements
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.)
Withdrawn
Application number
EP94302505A
Other languages
German (de)
English (en)
Other versions
EP0624893A2 (fr
Inventor
Kevin Dennis Ward
Michael Anthony Brewin
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.)
Teledyne UK Ltd
Original Assignee
EEV 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
Priority claimed from GB939309738A external-priority patent/GB9309738D0/en
Application filed by EEV Ltd filed Critical EEV Ltd
Publication of EP0624893A2 publication Critical patent/EP0624893A2/fr
Publication of EP0624893A3 publication Critical patent/EP0624893A3/fr
Withdrawn legal-status Critical Current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
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0273—Magnetic circuits with PM for magnetic field generation
    • H01F7/0278—Magnetic circuits with PM for magnetic field generation for generating uniform fields, focusing, deflecting electrically charged particles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2223/00—Details of transit-time tubes of the types covered by group H01J2225/00
    • H01J2223/02—Electrodes; Magnetic control means; Screens
    • H01J2223/08—Focusing arrangements, e.g. for concentrating stream of electrons, for preventing spreading of stream
    • H01J2223/087—Magnetic focusing arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2225/00—Transit-time tubes, e.g. Klystrons, travelling-wave tubes, magnetrons
    • H01J2225/02—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
    • H01J2225/10—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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2225/00—Transit-time tubes, e.g. Klystrons, travelling-wave tubes, magnetrons
    • H01J2225/34—Travelling-wave tubes; Tubes in which a travelling wave is simulated at spaced gaps

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
EP94302505A 1993-05-12 1994-04-08 Dispositifs magnétiques. Withdrawn EP0624893A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB939309738A GB9309738D0 (en) 1993-05-12 1993-05-12 Magnet arrangements
GB9309738 1993-05-12
GB9317434 1993-08-03
GB9317434A GB2278231A (en) 1993-05-12 1993-08-03 Magnet arrangements

Publications (2)

Publication Number Publication Date
EP0624893A2 EP0624893A2 (fr) 1994-11-17
EP0624893A3 true EP0624893A3 (fr) 1995-10-11

Family

ID=26302885

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94302505A Withdrawn EP0624893A3 (fr) 1993-05-12 1994-04-08 Dispositifs magnétiques.

Country Status (1)

Country Link
EP (1) EP0624893A3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113471037B (zh) * 2021-06-30 2022-05-13 电子科技大学 一种一体化带状注聚焦系统
CN115775667B (zh) * 2022-12-21 2026-02-06 南京邮电大学 一种Halbach永磁体阵列

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3013173A (en) * 1959-02-16 1961-12-12 Varian Associates Magnetic beam focusing method and apparatus
GB2046011A (en) * 1979-04-03 1980-11-05 Thomson Csf Periodic permanent magnet focussing systems
US5014028A (en) * 1990-04-25 1991-05-07 The United States Of America As Represented By The Secretary Of The Army Triangular section permanent magnetic structure
USRE33736E (en) * 1987-08-24 1991-11-05 The United States Of America As Represented By The Secretary Of The Army Periodic permanent magnet structure with increased useful field

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3013173A (en) * 1959-02-16 1961-12-12 Varian Associates Magnetic beam focusing method and apparatus
GB2046011A (en) * 1979-04-03 1980-11-05 Thomson Csf Periodic permanent magnet focussing systems
USRE33736E (en) * 1987-08-24 1991-11-05 The United States Of America As Represented By The Secretary Of The Army Periodic permanent magnet structure with increased useful field
US5014028A (en) * 1990-04-25 1991-05-07 The United States Of America As Represented By The Secretary Of The Army Triangular section permanent magnetic structure

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
J. P. CLARKE AND H. A. LEUPOLD: "Field enhancement in travelling wave tubes with tapered pole pieces", JOURNAL OF APPLIED PHYSICS, vol. 63, no. 8, Part IIB, 15 April 1988 (1988-04-15), WOODBURY, NY, USA, pages 3991 - 3992 *
R. J. PARKER: "Advances in permanent magnetism", WILEY &SONS, NEW YORK, USA *

Also Published As

Publication number Publication date
EP0624893A2 (fr) 1994-11-17

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