GB1292073A - Shunt for magnetic systems using permanent magnets - Google Patents

Shunt for magnetic systems using permanent magnets

Info

Publication number
GB1292073A
GB1292073A GB1564970A GB1564970A GB1292073A GB 1292073 A GB1292073 A GB 1292073A GB 1564970 A GB1564970 A GB 1564970A GB 1564970 A GB1564970 A GB 1564970A GB 1292073 A GB1292073 A GB 1292073A
Authority
GB
United Kingdom
Prior art keywords
flux
discs
magnet
polepieces
rings
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
GB1564970A
Inventor
Jury Afanasievich Melnikov
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB1564970A priority Critical patent/GB1292073A/en
Priority to FR7012716A priority patent/FR2086769A5/fr
Publication of GB1292073A publication Critical patent/GB1292073A/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
    • 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
    • H01F7/0284—Magnetic circuits with PM for magnetic field generation for generating uniform fields, focusing, deflecting electrically charged particles using a trimmable or adjustable magnetic circuit, e.g. for a symmetric dipole or quadrupole magnetic field
    • 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
    • H01J23/10—Magnet systems for directing or deflecting the discharge along a desired path, e.g. a spiral path

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microwave Tubes (AREA)

Abstract

1292073 Permanent magnets; transit-time tubes J A MELNIKOV 2 April 1970 15649/70 Headings H1D and H1P In a permanent magnet, e.g. for a magnetron or travelling wave-tube or for a magnetic focusing system, poles 1 co-operating with shielding yoke 3 are surrounded by annular discs 2 of magnetically soft material variably separated by ring 4 of high thermal expansivity, which shunt the magnet field so that variations of gap magnetic flux with temperature are compensated (Figs. 1a, 1b). The discs may have orthogonal projecting lugs sliding one over the other to provide a shunting flux path (Figs. 2a, 2b, not shown). A ring magnet 6 having end polepieces 7 (Figs. 3, 4) may be surrounded by annular magnetically soft discs 2 having studs 8 engaging inclined grooves of a split ring 9 of high thermal expansivity anchored at one end to the polepieces, so that the disc separation is varied with temperature to compensate flux variations. Two radially magnetized rings co-operating with a yoke (Figs. 5, 6, not shown) may have opposed hollow central polepieces containing elements of high thermal expansivity adjusting the spacing of conical spring steel discs from the magnetic rings, to compensate variations of gap flux. A focusing magnet (Figs. 7, 8) comprises an inner tube surrounded by ring magnets 6 and surrounding magnetically soft spaced discs 2, interconnected by a magnetically soft bar 16 terminating in an end member attached to a compensating pair of diametrically opposed bars 17 of high thermal expansivity; which expand and contract with temperature change, shifting the discs towards and away from the centres of the magnet rings, whereby changes of magnetic flux in the inner tube is compensated for temperature change. In a modification (Figs. 9, 10, not shown) magnetically soft rings surround each magnet circumferentially and fully or partly overlie adjacent polepieces whereby a portion of the flux is shunted. Diametrically opposed bars of highly thermal expansive material are arranged to traverse the rings with temperature changes over the magnets and polepieces to compensate the flux in the inner tube. The magnets may be ferrite.
GB1564970A 1970-04-02 1970-04-02 Shunt for magnetic systems using permanent magnets Expired GB1292073A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1564970A GB1292073A (en) 1970-04-02 1970-04-02 Shunt for magnetic systems using permanent magnets
FR7012716A FR2086769A5 (en) 1970-04-02 1970-04-08

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1564970A GB1292073A (en) 1970-04-02 1970-04-02 Shunt for magnetic systems using permanent magnets
FR7012716A FR2086769A5 (en) 1970-04-02 1970-04-08

Publications (1)

Publication Number Publication Date
GB1292073A true GB1292073A (en) 1972-10-11

Family

ID=26215667

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1564970A Expired GB1292073A (en) 1970-04-02 1970-04-02 Shunt for magnetic systems using permanent magnets

Country Status (2)

Country Link
FR (1) FR2086769A5 (en)
GB (1) GB1292073A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3007590A1 (en) * 1979-02-28 1980-09-04 Tokyo Shibaura Electric Co MAGNETIC UNIT
US4338545A (en) * 1979-02-28 1982-07-06 Tokyo Shibaura Denki Kabushiki Kaisha Magnetron unit with a magnetic field adjusting means
DK178602B1 (en) * 2010-03-31 2016-08-15 E2V Tech (Uk) Ltd Magnetron

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3007590A1 (en) * 1979-02-28 1980-09-04 Tokyo Shibaura Electric Co MAGNETIC UNIT
GB2044990A (en) * 1979-02-28 1980-10-22 Tokyo Shibaura Electric Co Magnetron with thermally compensated magnetic system
US4338545A (en) * 1979-02-28 1982-07-06 Tokyo Shibaura Denki Kabushiki Kaisha Magnetron unit with a magnetic field adjusting means
DE3007590C2 (en) * 1979-02-28 1985-07-25 Tokyo Shibaura Denki K.K., Kawasaki, Kanagawa Magnetron unit
DK178602B1 (en) * 2010-03-31 2016-08-15 E2V Tech (Uk) Ltd Magnetron

Also Published As

Publication number Publication date
FR2086769A5 (en) 1971-12-31

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees