US3311778A - Travelling wave tube operating with helically moving electrostatically guided electron beam - Google Patents

Travelling wave tube operating with helically moving electrostatically guided electron beam Download PDF

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Publication number
US3311778A
US3311778A US318708A US31870863A US3311778A US 3311778 A US3311778 A US 3311778A US 318708 A US318708 A US 318708A US 31870863 A US31870863 A US 31870863A US 3311778 A US3311778 A US 3311778A
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US
United States
Prior art keywords
electron beam
delay line
along
travelling 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.)
Expired - Lifetime
Application number
US318708A
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English (en)
Inventor
Poschl Klaus
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 and Halske AG
Siemens Corp
Original Assignee
Siemens Corp
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Filing date
Publication date
Application filed by Siemens Corp filed Critical Siemens Corp
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Publication of US3311778A publication Critical patent/US3311778A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • 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
    • H01J23/09—Electric systems for directing or deflecting the discharge along a desired path, e.g. E-type

Definitions

  • the invention disclosed herein is concerned with a travelling wave tube, especially a high power tube, operating with an electron beam which is guided electrostatically along a helical path extending between an outer and an inner conductor, the inner conductor, which is with respect to the outer electrode acted on by a positive direct potential, being helically wound about the tube axis and operating as a delay line along which an electromagnetic wave is propagated with azimuthal delay following the electron beam motion.
  • travelling wave tube known in which the electron beam is electrostatically guided along a helical path, in the space between a delay line and a cylindrical inner conductor which is with respect to the delay line acted on by a positive direct potential.
  • the delay line extends helically about the cylindrical conductor which is crosssectionally circular.
  • the electrons moving along their paths are in reciprocal action with a wave guided along the delay line.
  • the reciprocal action causes the electrons in known manner to give off energy to the high frequency field of the wave.
  • a braking action is thus exerted on the electrons, with the consequence that the electrons reach the equilibrium paths with a smaller radius and that the spacing thereof from the delay line is increased.
  • the velocity of the electrons is so dimensioned that the angular velocity thereof is upon entering the helical path equal to or negligibly greater than the angular phase velocity of the wave along the delay line, which is coupled to the electron beam.
  • the assumption underlying this dimensioning of the velocity was, that the electrons, upon reaching an equilibrium path with smaller radius by giving off kinetic energy to the high frequency field of the wave, retain their angular velocity.
  • the synchronism which was originally present between the electrons and an electromagnetic wave propagated along the delay line, should in this manner be retained along the length of the discharge path, which is necessary for obtaining high officiency of the tube.
  • the invention is based upon the recognition of the surprising fact that the angular velocity of the electrons becomes upon transition from a path with greater radius to an equilibrium path with smaller radius, greater by the ratio of the radii. Accordingly, if synchronism between the electrons and the wave running along the delay line should already obtain upon entry of the electrons into the helical path, the electrons would, upon approaching the delay line due to the reciprocal action of the electrons with the wave, become ever faster and would thus come out of synchronism with the wave.
  • FIGURE 1 is a side elevational view partly in section of the travelling wave tube constructed in accordance with the principles of the present invention.
  • FIGURE 2 is a schematic end view of the travelling wave tube illustrated in FIGURE 1 and showing schematically the various structural elements thereof.
  • the travelling wave tube of the present invention includes a delay line (inner conductor) 1 which is helically wound about the tube axis. Enclosing the delay line 1 is an outer conductor or electrode 2. An electron beam 3 is electrostatically guided along a helical path extending between the delay line 1 and the outer conductor 2 from an electron beam generating gun 4 to an electron collector 5.
  • the angular velocity of the electrons is indicated by and the phase velocity of the wave propagated along the delay line, which is coupled to the electron beam 3, is indicated by @ph. According to the present invention, there must be satisfied the requirement /ph l.
  • the angular velocity of the electrons is adjusted by means of an adjusting device 6 connected to the electron beam generating gun 4.

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  • Microwave Tubes (AREA)
  • Electron Sources, Ion Sources (AREA)
US318708A 1962-10-25 1963-10-24 Travelling wave tube operating with helically moving electrostatically guided electron beam Expired - Lifetime US3311778A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES82176A DE1290635B (de) 1962-10-25 1962-10-25 Lauffeldverstaerkerroehre, insbesondere fuer hohe Leistungen, mit einem rein elektrostatisch gefuehrten Elektronenstrahl

Publications (1)

Publication Number Publication Date
US3311778A true US3311778A (en) 1967-03-28

Family

ID=7510150

Family Applications (1)

Application Number Title Priority Date Filing Date
US318708A Expired - Lifetime US3311778A (en) 1962-10-25 1963-10-24 Travelling wave tube operating with helically moving electrostatically guided electron beam

Country Status (4)

Country Link
US (1) US3311778A (enrdf_load_stackoverflow)
DE (1) DE1290635B (enrdf_load_stackoverflow)
GB (1) GB1002013A (enrdf_load_stackoverflow)
NL (1) NL299319A (enrdf_load_stackoverflow)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2813996A (en) * 1954-12-16 1957-11-19 Univ Leland Stanford Junior Bunching means for particle accelerators

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL229229A (enrdf_load_stackoverflow) * 1957-07-18

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2813996A (en) * 1954-12-16 1957-11-19 Univ Leland Stanford Junior Bunching means for particle accelerators

Also Published As

Publication number Publication date
GB1002013A (en) 1965-08-18
DE1290635B (de) 1969-03-13
NL299319A (enrdf_load_stackoverflow)

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