US2956193A - Magnet system for travelling wave tubes - Google Patents

Magnet system for travelling wave tubes Download PDF

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Publication number
US2956193A
US2956193A US741871A US74187158A US2956193A US 2956193 A US2956193 A US 2956193A US 741871 A US741871 A US 741871A US 74187158 A US74187158 A US 74187158A US 2956193 A US2956193 A US 2956193A
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US
United States
Prior art keywords
magnet system
rods
travelling wave
sets
wave tubes
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 - Lifetime
Application number
US741871A
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English (en)
Inventor
Wit Cornelis Teunis De
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.)
US Philips Corp
North American Philips Co Inc
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US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US2956193A publication Critical patent/US2956193A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

Definitions

  • This invention relates to a magnet system for a travelling-wave tube comprising two sets of radially arranged rods which are permanently magnetized in opposite radial directions, these radial sets or stars being arranged coaxially with one another at a slight distance from one another while their outer ends are connected by axial soft iron closing parts, pole pieces being provided at the inner ends.
  • a magnet system for a travelling-wave tube comprising two sets of radially arranged rods which are permanently magnetized in opposite radial directions, which sets or stars are arranged coaxially with one another at a slight distance from one another while their outer ends are connected by axial soft iron closing parts, pole pieces being provided centrally of both stars, provision is made, at a slight distance from at least one of the two permanently magnetized stars, parallel thereto and within the magnet system, of a star of permanent-magnetic material which is magnetized in the same sense and has a strength such that at this side the magnetic fields has a uniform variation in the axial direction while this star links up with the soft iron closing parts on the outside.
  • the invention preferably provision is made, in the vicinity of the two stars of permanently magnetized material, of an additional star of magnetic material so that the magnetic field has a uniform variation in the axial direction at both ends. If a stronger field is required at the output end of the travelling-wave tube, for example in a high-powertube, at this end either the two stars can be joined or the magnetic star can be made heavier.
  • Fig. 6 again shows a field variation.
  • reference numeral 1 denotes permanently magnetized rods arranged so as to form fourpointed stars, one at each end of a magnet system the pole pieces of which are designated 2 and 3 respectively.
  • Soft-iron closing parts are designated 4.
  • Fig. 3 shows the direction of magnetization.
  • the solid curve shows the value of the magnetic field Bz in the axial direction in the axis, without the tubular soft-iron casing, as a function of the position.
  • parts corresponding to those of Fig. 1 are designated similarly, the additional rods of magnet steel in accordance with the invention being denoted by 5.
  • the soft-iron tubular casing which in the known arrangements is also required to reduce the radial field, is replaced by a stack of thin mu-metal rings 6 of 0.2 mm. alternating with thicker rings of hard paper 7 of thickness about 3 mms. This construction is known per se for avoiding radial fields in travelling-wave tubes. The axial field is hardly modified.
  • Fig. 5 shows a construction in accordance with the invention in which the field is increased at the output side of the travellingwave tube by using at this end magnet rods which are slightly longer and thicker.
  • Fig. 6 shows the associated field variation.
  • An electron-beam concentrating magnet system for a travelling wave electron discharge tube comprising two coaxial spaced apart sets of radially positioned rods of ferromagnetic material permanently magnetized in opposite radial directions and soft ferromagnetic members connecting the outer ends of the rods, a third set of radially positioned rods of ferromagnetic material located intermediate and adjacent one of the other two sets, said third set of rods being permanently magnetized in the same radial direction as the adjoining set of rods and having a field strength at which the magnetic field strength between the first two sets has a uniform variation of field strength in the axial direction therebetween, said third set of rods being connected to said soft ferromagnetic members connecting said first two sets of rods.
  • a magnet system as claimed in claim 1 in which an additional set of rods, permanently magnetized in an opposite radial direction is located intermediate and adjacent the other of the first two sets of rods.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microwave Tubes (AREA)
  • Particle Accelerators (AREA)
US741871A 1957-07-11 1958-06-13 Magnet system for travelling wave tubes Expired - Lifetime US2956193A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL218874 1957-07-11

Publications (1)

Publication Number Publication Date
US2956193A true US2956193A (en) 1960-10-11

Family

ID=19750926

Family Applications (1)

Application Number Title Priority Date Filing Date
US741871A Expired - Lifetime US2956193A (en) 1957-07-11 1958-06-13 Magnet system for travelling wave tubes

Country Status (6)

Country Link
US (1) US2956193A (en, 2012)
CH (1) CH362758A (en, 2012)
DE (1) DE1112790B (en, 2012)
FR (1) FR1211420A (en, 2012)
GB (1) GB865725A (en, 2012)
NL (2) NL107303C (en, 2012)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3164742A (en) * 1960-12-27 1965-01-05 Gen Electric High frequency energy interchange device
US3181042A (en) * 1961-05-02 1965-04-27 Siemens Ag Permanent magnet system for focusing an electron beam
US3183398A (en) * 1960-08-04 1965-05-11 Raytheon Co Beam focusing magnet
US3283200A (en) * 1963-12-12 1966-11-01 Varian Associates High frequency electron discharge device having improved permanent magnetic focusing
US3329915A (en) * 1964-08-12 1967-07-04 Siemens Ag Permanent magnet system for the bundled guidance of an electron beam over a relatively long path, especially for traveling wave tubes
US3349354A (en) * 1965-06-02 1967-10-24 Miyata Saburo Means for imposing electric and magnetic fields on flowing fluids
US3436587A (en) * 1965-01-26 1969-04-01 Siemens Ag Permanent magnet system for the generation of a substantially homogeneous magnetic field for the bundled guidance of an electron beam over a relatively long path,especially for traveling wave tubes
US3896329A (en) * 1972-09-21 1975-07-22 Varian Associates Permanent magnet beam focus structure for linear beam tubes
US5744910A (en) * 1993-04-02 1998-04-28 Litton Systems, Inc. Periodic permanent magnet focusing system for electron beam

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL133615C (en, 2012) * 1962-10-04

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB748946A (en) * 1953-03-26 1956-05-16 Standard Telephones Cables Ltd Improvements in or relating to travelling wave apparatus
US2825840A (en) * 1953-01-29 1958-03-04 Itt Traveling wave electron discharge devices
US2844754A (en) * 1953-04-29 1958-07-22 Bell Telephone Labor Inc Electron beam focusing system
US2844750A (en) * 1954-09-22 1958-07-22 Siemens Ag Focused electron flow electron tube for very high frequencies
US2876373A (en) * 1956-03-01 1959-03-03 Siemens Ag Magnet system for the focusing of electron beams

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1098625B (de) * 1953-11-13 1961-02-02 Siemens Ag Magnetisches Buendelungssystem zur gebuendelten Fuehrung einer (mehrerer) Elektronenstroemung (en) mittels eines homogenen Magnetfeldes laengs einer groesseren Wegstrecke, insbesondere fuer Wanderfeldroehren

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2825840A (en) * 1953-01-29 1958-03-04 Itt Traveling wave electron discharge devices
GB748946A (en) * 1953-03-26 1956-05-16 Standard Telephones Cables Ltd Improvements in or relating to travelling wave apparatus
US2844754A (en) * 1953-04-29 1958-07-22 Bell Telephone Labor Inc Electron beam focusing system
US2844750A (en) * 1954-09-22 1958-07-22 Siemens Ag Focused electron flow electron tube for very high frequencies
US2876373A (en) * 1956-03-01 1959-03-03 Siemens Ag Magnet system for the focusing of electron beams

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3183398A (en) * 1960-08-04 1965-05-11 Raytheon Co Beam focusing magnet
US3164742A (en) * 1960-12-27 1965-01-05 Gen Electric High frequency energy interchange device
US3181042A (en) * 1961-05-02 1965-04-27 Siemens Ag Permanent magnet system for focusing an electron beam
US3283200A (en) * 1963-12-12 1966-11-01 Varian Associates High frequency electron discharge device having improved permanent magnetic focusing
US3329915A (en) * 1964-08-12 1967-07-04 Siemens Ag Permanent magnet system for the bundled guidance of an electron beam over a relatively long path, especially for traveling wave tubes
US3436587A (en) * 1965-01-26 1969-04-01 Siemens Ag Permanent magnet system for the generation of a substantially homogeneous magnetic field for the bundled guidance of an electron beam over a relatively long path,especially for traveling wave tubes
US3349354A (en) * 1965-06-02 1967-10-24 Miyata Saburo Means for imposing electric and magnetic fields on flowing fluids
US3896329A (en) * 1972-09-21 1975-07-22 Varian Associates Permanent magnet beam focus structure for linear beam tubes
US5744910A (en) * 1993-04-02 1998-04-28 Litton Systems, Inc. Periodic permanent magnet focusing system for electron beam

Also Published As

Publication number Publication date
CH362758A (de) 1962-06-30
GB865725A (en) 1961-04-19
NL218874A (en, 2012)
NL107303C (en, 2012)
FR1211420A (fr) 1960-03-16
DE1112790B (de) 1961-08-17

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