EP0115042A1 - Système de focalisation avec des aimants permanents alternés pour un tube à ondes progressives - Google Patents

Système de focalisation avec des aimants permanents alternés pour un tube à ondes progressives Download PDF

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Publication number
EP0115042A1
EP0115042A1 EP83112932A EP83112932A EP0115042A1 EP 0115042 A1 EP0115042 A1 EP 0115042A1 EP 83112932 A EP83112932 A EP 83112932A EP 83112932 A EP83112932 A EP 83112932A EP 0115042 A1 EP0115042 A1 EP 0115042A1
Authority
EP
European Patent Office
Prior art keywords
magnetic
pole
tubes
traveling wave
wave tube
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.)
Granted
Application number
EP83112932A
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German (de)
English (en)
Other versions
EP0115042B1 (fr
Inventor
Roland Dipl.-Phys. Dr.-Techn. Wolfram
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0115042A1 publication Critical patent/EP0115042A1/fr
Application granted granted Critical
Publication of EP0115042B1 publication Critical patent/EP0115042B1/fr
Expired 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
    • H01J23/0873—Magnetic focusing arrangements with at least one axial-field reversal along the interaction space, e.g. P.P.M. focusing

Definitions

  • the invention relates to a traveling wave tube according to the preamble of claim 1.
  • Such focusing systems generally consist of permanent magnet rings and interposed pole pieces made of ferromagnetic material.
  • Such a pole shoe arrangement is known from DE-AS 14 91 529. This also serves as a vacuum envelope.
  • the pole pieces are precisely aligned to the axis by simultaneous mechanical processing of all pole piece inner holes.
  • the magnetic rings are centered on the inside diameter.
  • Coupled Caviry line with a "hat” is particularly suitable for this. (ie the parts of the line disks adjacent to the axis are designed as tubes).
  • Fig. 1 shows schematically a conventional system of this kind.
  • Fig. 2 shows schematically the magnetic field generated by such a system.
  • every second line disc is designed as an active pole piece coupled to the magnet. Firstly, this compensates for the magnetic asymmetry caused by the coupling slots and secondly suppresses the first-order ripple by means of the harmonics of the magnetic field.
  • the 1st order ripple is almost completely suppressed by a field profile according to FIG. 2.
  • the ratio h / 1 (gap / cell length) is predetermined by the dimensioning of the delay line, which largely defines the magnetic construction parameters.
  • the thickness t of the line washers should be as thin as possible, because otherwise the coupling resistance in the beam area is reduced due to an unfavorable shift in the electric field.
  • the invention has for its object to enable focusing for higher powers and frequencies in a traveling wave tube.
  • the traveling wave tube according to the invention has the advantage that the line dimensioning is retained due to the separation of the magnetic iron contours from the non-magnetic metal contours, while the iron load on the disk is reduced and thus a higher magnetic field strength in the beam area can be achieved and permitted. This makes it possible to focus on higher powers and frequencies.
  • the active pole piece coupled to the magnet is only one disc, the intermediate one pole shoe is now just a tube.
  • the iron load in point B is then reduced by about 15%.
  • the 1st order ripple can be made to disappear entirely.
  • the ratio of tube length b to magnetic field period L should be from 0.065 to 0.15.
  • the periodically permanent magnetic focusing system shown in Fig. 1 for a traveling wave tube consists in essentially from a cylindrical vacuum sleeve 3, which is surrounded by a permanent magnet system made of pole pieces 1 and interposed magnetic rings 2 polarized alternately in opposite directions in the axial direction: the pole pieces 1, 5 are inserted into the vacuum cover 3 and the parts surrounding the beam axis 7 are tubes 4 trained. Every second pole piece 1 is coupled to the magnet rings 2 as an active pole piece 1.
  • the pole shoes 5 arranged in between are connected to the vacuum envelope 3 and, apart from their tubes 6 surrounding the beam axis 7, are made of a non-magnetic metal.
  • the active pole shoes 1 and their tubes 4 consist entirely of magnetic iron.
  • the ratio h / 1 (gap length / cell length) is specified by the dimensioning of the delay line.
  • the thickness t of the pole shoe discs 1 should be as thin as possible.
  • L / 2 indicates half a magnetic field period L. The highest value of the iron load is reached at the point marked with the letter B.
  • Fig. 2 shows schematically the magnetic field B (z) generated in such a system.
  • the periodic permanent magnetic focusing system shown in FIGS. 3, 4 and 5 again consists essentially of a cylindrical vacuum envelope 3 made of a non-magnetic metal.
  • the permanent magnet system surrounding the vacuum envelope 3 is formed from active pole pieces 1 and each interposed magnetic rings 2 polarized alternately in opposite directions in the axial direction.
  • the active pole shoes 1 are inserted into the vacuum envelope 3 and their parts surrounding the beam axis 7 are designed as tubes 4.
  • pole shoes 5 are arranged, which are connected on the inside to the vacuum envelope 3.
  • the active pole shoes 1 coupled to the magnetic rings 2 consist of magnetic metal, preferably magnetic iron.
  • the tubes 4 of these pole shoes 1 are made of non-magnetic metal on the end faces 8.
  • these parts 8 made of non-magnetic metal extend as far as the part of the pole shoes 1 forming the tube 4.
  • the pole shoes 5 arranged between the active pole pieces 1, like the vacuum envelope 3, are made of a non-magnetic metal, preferably of copper.
  • the tubes 6 of these pole pieces 5 consist of magnetic metal, preferably magnetic iron in their inner part and 9 of non-magnetic metal, preferably copper, on their end faces 9.
  • the tubes 6 of the pole shoes 5 consist entirely of magnetic metal, preferably of magnetic iron. 2 to 4, the letter h in turn denotes the gap length and the letter '1 the cell length. L / 2 is half the magnetic field period L and B is the point with the highest iron load. The thickness t of the pole shoe discs 1 should in turn be as small as possible.
  • the letter b denotes the tube length.
  • the coupling slots in the pole pieces 1, 5 are provided with the reference number 10 in the figures.
  • pole shoe ends can also be disc-shaped, i.e. the tubes do not necessarily have to have side projections.

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  • Microwave Tubes (AREA)
  • Particle Accelerators (AREA)
EP83112932A 1982-12-30 1983-12-21 Système de focalisation avec des aimants permanents alternés pour un tube à ondes progressives Expired EP0115042B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3248693 1982-12-30
DE19823248693 DE3248693A1 (de) 1982-12-30 1982-12-30 Wanderfeldroehre mit periodisch-permanentmagnetischem fokussiersystem

Publications (2)

Publication Number Publication Date
EP0115042A1 true EP0115042A1 (fr) 1984-08-08
EP0115042B1 EP0115042B1 (fr) 1987-08-19

Family

ID=6182198

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83112932A Expired EP0115042B1 (fr) 1982-12-30 1983-12-21 Système de focalisation avec des aimants permanents alternés pour un tube à ondes progressives

Country Status (3)

Country Link
US (1) US4560904A (fr)
EP (1) EP0115042B1 (fr)
DE (2) DE3248693A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4742271A (en) * 1985-03-25 1988-05-03 Raytheon Company Radial-gain/axial-gain crossed-field amplifier (radaxtron)
US5332947A (en) * 1992-05-13 1994-07-26 Litton Systems, Inc. Integral polepiece RF amplification tube for millimeter wave frequencies

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324339A (en) * 1964-02-27 1967-06-06 Hughes Aircraft Co Periodic permanent magnet electron beam focusing arrangement for traveling-wave tubes having plural interaction cavities in bore of each annular magnet
DE1491529B1 (de) * 1963-02-06 1971-07-15 Varian Associates Lauffeldroehre
FR2313765A1 (fr) * 1975-06-06 1976-12-31 Hughes Aircraft Co Dispositif de focalisation d'un faisceau d'electrons couple a un dispositif a onde ralentie pour tube a ondes progressives
EP0037309A1 (fr) * 1980-04-01 1981-10-07 Thomson-Csf Tube à ondes progressives à cavités couplées et focalisation par aimants permanents alternés, et ensemble amplificateur comprenant un tel tube

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324439A (en) * 1964-02-27 1967-06-06 Beckman Instruments Inc Electrical terminations for cermet resistance elements
DE1491426A1 (de) * 1964-08-12 1969-05-22 Siemens Ag Permanentmagnetsystem zur gebuendelten Fuehrung eines Elektrodenstrahls ueber eine lengere Wegstrecke,insbesondere fuer Wanderfeldroehren
US3617802A (en) * 1970-05-06 1971-11-02 Us Navy Traveling wave tube
GB1451956A (en) * 1973-02-16 1976-10-06 English Electric Valve Co Ltd Travelling wave tubes
US4041349A (en) * 1973-02-16 1977-08-09 English Electric Valve Company Limited Travelling wave tubes
DE2556464C2 (de) * 1975-12-15 1977-10-13 Siemens AG, 1000 Berlin und 8000 München Lauffeldröhre mit einer zylinderförmigen Vakuumhülle
US4072877A (en) * 1976-07-30 1978-02-07 English Electric Valve Co., Ltd. Travelling wave tubes
US4137482A (en) * 1977-05-12 1979-01-30 Varian Associates, Inc. Periodic permanent magnet focused TWT
NL8020101A (nl) * 1980-01-28 1981-12-01 Sergei Sergeevich Drozdov Mikh Omkeerbaar periodiek magnetisch focusseersysteem.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1491529B1 (de) * 1963-02-06 1971-07-15 Varian Associates Lauffeldroehre
US3324339A (en) * 1964-02-27 1967-06-06 Hughes Aircraft Co Periodic permanent magnet electron beam focusing arrangement for traveling-wave tubes having plural interaction cavities in bore of each annular magnet
FR2313765A1 (fr) * 1975-06-06 1976-12-31 Hughes Aircraft Co Dispositif de focalisation d'un faisceau d'electrons couple a un dispositif a onde ralentie pour tube a ondes progressives
EP0037309A1 (fr) * 1980-04-01 1981-10-07 Thomson-Csf Tube à ondes progressives à cavités couplées et focalisation par aimants permanents alternés, et ensemble amplificateur comprenant un tel tube

Also Published As

Publication number Publication date
DE3373161D1 (en) 1987-09-24
EP0115042B1 (fr) 1987-08-19
US4560904A (en) 1985-12-24
DE3248693A1 (de) 1984-07-05

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