GB929793A - Magnetic focussing device - Google Patents

Magnetic focussing device

Info

Publication number
GB929793A
GB929793A GB768/60A GB76860A GB929793A GB 929793 A GB929793 A GB 929793A GB 768/60 A GB768/60 A GB 768/60A GB 76860 A GB76860 A GB 76860A GB 929793 A GB929793 A GB 929793A
Authority
GB
United Kingdom
Prior art keywords
pair
polepieces
magnets
adjacent
metal member
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
GB768/60A
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.)
NEC Corp
Original Assignee
Nippon Electric Co 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 Nippon Electric Co Ltd filed Critical Nippon Electric Co Ltd
Publication of GB929793A publication Critical patent/GB929793A/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

929,793. Travelling wave tubes. NIPPON ELECTRIC CO. Ltd. Jan. 8, 1960 [Jan. 14, 1959], No. 768/60. Class 39 (1). An electron beam periodic magnetic focusing arrangement comprises a set of annular permanent magnets 2, 3, Fig. 1B, positioned adjacent one another along a common axis to provide an axial magnetic field of constant period and peak flux density, a hollow metal member 1 of non- magnetic material providing means for radio frequency coupling to the beam positioned between a pair of the magnets 2, 3, the pair of magnets 2, 3 being similar to one another and arranged with unlike poles adjacent one another; an inner pair of annular polepieces 7, 8 positioned one on each side of the hollow metal member 1 between it and the adjacent pair of magnets 2, 3, an outer pair of annular polepieces 4, 5 and at least one flux shunting strip 6 of soft magnetic material bridging across the hollow metal member 1 between the members of the outer pair of polepieces, each member of the two pairs of polepieces 4, 7, 8, 5 having an external diameter less than that of the pair of magnets 2, 3; the arrangement being such that there is provided along the axis between the inner pair of polepieces 7, 8 and between each of the pair of inner polepieces 7, 8 and the adjacent one of the pair of outer polepieces 4, 5 respective half-periods of the said axial magnetic field. The magnets 2, 3 are larger than those surrounding the delay line of the travelling wave tube, and 1 is a coupling waveguide. The shorting strip 6 is saturated to minimize the external leakage flux.
GB768/60A 1959-01-14 1960-01-08 Magnetic focussing device Expired GB929793A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP100059 1959-01-14

Publications (1)

Publication Number Publication Date
GB929793A true GB929793A (en) 1963-06-26

Family

ID=11489301

Family Applications (1)

Application Number Title Priority Date Filing Date
GB768/60A Expired GB929793A (en) 1959-01-14 1960-01-08 Magnetic focussing device

Country Status (2)

Country Link
US (1) US3001094A (en)
GB (1) GB929793A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3061754A (en) * 1960-03-18 1962-10-30 Gen Precision Inc Temperature compensating element for a traveling wave tube periodic array
DE1277449B (en) * 1962-03-17 1968-09-12 Telefunken Patent Magnetic focusing arrangement for the bundled guidance of an electron beam, especially for traveling wave tubes

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2855537A (en) * 1953-04-29 1958-10-07 Bell Telephone Labor Inc Electron beam focusing
US2812470A (en) * 1954-10-22 1957-11-05 Bell Telephone Labor Inc Periodic focusing in traveling wave tubes
BE545514A (en) * 1954-11-12
BE550523A (en) * 1955-10-27

Also Published As

Publication number Publication date
US3001094A (en) 1961-09-19

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