US3277332A - Electrostatically focused high power traveling wave tube with spiral electron beam path - Google Patents

Electrostatically focused high power traveling wave tube with spiral electron beam path Download PDF

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Publication number
US3277332A
US3277332A US275483A US27548363A US3277332A US 3277332 A US3277332 A US 3277332A US 275483 A US275483 A US 275483A US 27548363 A US27548363 A US 27548363A US 3277332 A US3277332 A US 3277332A
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United States
Prior art keywords
electron beam
delay line
high power
outer electrode
partial electrodes
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Expired - Lifetime
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US275483A
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English (en)
Inventor
Veith Werner
Mayerhofer Erich
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
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Siemens Corp
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    • 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 delay line structure is to be of a configuration such that periodic breakthroughs are provided at least in connection with the wall parts facing in the direction of the tube axis.
  • the metallic structure is, as compared with these wall parts of the delay line, placed on a lower direct potential and may be considered as the outer electrode of a cylindrical capacitor, the inner electrode of which is formed by the wall parts of the delay line facing the tube axis.
  • the outer electrode arranged in the delay line structure influences the high frequency field of the delay line, effecting especially a strong shielding of the high frequency [field from the radiation zone.
  • the object of the invention is to provide a high power travelling field tube with purely electrostatic focusing of the electron beam, wherein the high frequency field of the delay line is substantially unaffected by the focusing electrodes.
  • a shielding body forming a helical surface with the turns thereof arranged in known manner between the respective inner and outer electrodes, in order to avoid mutual influencing of the high frequency fields of the delay line in longitudinal direction of the tube.
  • the shielding body can thereby additionally serve for securing the inner and outer electrodes, it being understood, of course, that the outer electrode must be electrically insulated with respect to the shielding body.
  • FIG. 1 shows the amplifier part of a travelling field tube according to the invention
  • FIG. 2 represents on a larger scale a section A of FIG. 1;
  • FIG. 3 indicates the manner of focusing the electron beam
  • FIG. 4 illustrates in schematic manner how the direct voltage is conducted to the partial electrodes
  • FIG. 5 shows the use of a special web or brace for securing the delay line and the partial electrodes of the outer electrode.
  • FIG. 1 shows the amplification part of a travelling field tube according to the invention
  • FIG. 2 representing the section A of FIG. 1 to bring out details more clearly.
  • Numeral 1 indicates a ribbon-shaped electron beam which is guided along a spiral path about the tube axis z in the space between a delay line (inner electrode) formed by hook-like metal parts 2 and an outer electrode formed of individual periodically successive partial electrodes 3.
  • the partial electrodes 3 form U- sh-aped metal webs facing the tube envelope (not shown) and arranged in intermittent sequence with respect to the metal webs 2 of the delay line.
  • a helical shielding member 4 is provided for shielding the high frequency field of the delay line in the z direction, such shielding member also serving for securing the delay line.
  • the hooklike metal webs 2 are uniformly distributed over the circumference of the helical member and are soldered there to.
  • the partial electrodes 3 of the outer electrode which may be secured on the shielding body in insulated relation with respect thereto, are, as compared with the metal webs 2 and the shielding member 4, on a lower direct.
  • the two electrode systems comprising the metal webs 2 and the partial electrodes 3, form a chain of individual electrostatic lenses, through which the electron beam 1 is guided, as shown in FIG. 3, in the manner of a periodic electrostatic focusing.
  • the high frequency field of the delay line formed by the hook-like metal webs 2, is by the partial electrodes only very slightly affected.
  • FIG. 4 shows in schematic manner the direct voltage leads for the partial electrodes 3 of the outer electrode.
  • the partial electrodes receive a common negative bias over the line 5.
  • Two respective partial electrodes 3 which are electrically directly connected, form a group which is connected with the next following group by way of a short helical member 6.
  • the helices 6, which are to be dimensioned so that the transmission range of the tube falls within the barrier rangethereof, effect a choking of the direct voltage lead 5, thus preventing influencing of the high frequency properties of the delay line, for example, by feedback of the direct voltage lead 5.
  • the delay line and/ or the partial electrodes of the outer electrode need not necessarily be secured on the helical shielding member; they may be secured, as shown in FIG. 5, on a separate brace 7 which extends along the space between the helix parts of the shielding member 4.
  • the invention is not inherently limited to the described and illustrated examples. It is, for example, possible to use a helical line as a delay line. Such helical line may be advantageously secured on the brace 7 FIG.
  • the cooling of a travelling field tube according to the invention is advantageously effected by using a metallic vacuum envelope which can be soldered to the shielding member 4 and directly cooled by convection.
  • a high power travelling field tube especially for amplifying very high frequencies, with purely electrostatic focusing of the electron beam which is guided along a spiral path within the space of an inner and an outer electrode, which electrodes are jointly spirally disposed about the tube axis, said inner electrode being formed as a delay line which embraces the electron beam at least in part and along which an electromagnetic wave is spread with azimuthal delay, said outer electrode being subdivided into individual periodic-ally successively disposed partial electrodes.
  • a travelling field tube comprising a plurality of groups of partial electrodes, each group having the same number of partial electrodes, means for electrically interconnecting the partial electrodes of each group, and helical members for connecting the re.- spective groups.
  • each group comprises two partial electrodes.
  • a travelling field tube comprising a metallic 'helicall'y extending shielding body, said inner and outer electrodes being disposed between the turns of said shielding body.
  • a travelling field tube according to claim 4, wherein said inner and outer electrodes are secured on said helical shielding body.
  • a travelling field tube according to claim 5, wherein said inner electrode comprises hook-shaped metal webs which are secured at the rim of the helical shielding body.
  • a travelling field tube wherein the outer and the inner electrode are respectively formed of a plurality of metal webs, forming partial electrodes, the partial electrodes of the outer electrode forming U- shaped metal webs facing the envelope of the tube and being arranged in intermittent sequence with respect to the webs of the inner electrode.
  • a travelling field tube comprising a separate brace extending spirally along the space between the turns of said shielding member, at least parts of one of said electrodes being secured on said brace.

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US275483A 1962-04-25 1963-04-23 Electrostatically focused high power traveling wave tube with spiral electron beam path Expired - Lifetime US3277332A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES79159A DE1189208B (de) 1962-04-25 1962-04-25 Lauffeldroehre hoher Leistung, insbesondere zur Verstaerkung von sehr kurzen elektrischen Wellen

Publications (1)

Publication Number Publication Date
US3277332A true US3277332A (en) 1966-10-04

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US275483A Expired - Lifetime US3277332A (en) 1962-04-25 1963-04-23 Electrostatically focused high power traveling wave tube with spiral electron beam path

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US (1) US3277332A (en))
DE (1) DE1189208B (en))
GB (1) GB977002A (en))
NL (1) NL291851A (en))

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2806177A (en) * 1953-05-05 1957-09-10 Hughes Aircraft Co Signal delay tube
US2900558A (en) * 1957-07-18 1959-08-18 Hewlett Packard Co Beam-type tube
US3099766A (en) * 1960-11-02 1963-07-30 Siemens Ag High capacity travelling wave tube for amplifying ultra high frequencies

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2806177A (en) * 1953-05-05 1957-09-10 Hughes Aircraft Co Signal delay tube
US2900558A (en) * 1957-07-18 1959-08-18 Hewlett Packard Co Beam-type tube
US3099766A (en) * 1960-11-02 1963-07-30 Siemens Ag High capacity travelling wave tube for amplifying ultra high frequencies

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Publication number Publication date
DE1189208B (de) 1965-03-18
GB977002A (en) 1964-12-02
NL291851A (en))

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