US3026445A - Travelling wave electron discharge tubes - Google Patents

Travelling wave electron discharge tubes Download PDF

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Publication number
US3026445A
US3026445A US798211A US79821159A US3026445A US 3026445 A US3026445 A US 3026445A US 798211 A US798211 A US 798211A US 79821159 A US79821159 A US 79821159A US 3026445 A US3026445 A US 3026445A
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United States
Prior art keywords
rods
travelling wave
winding
electron discharge
spring
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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
US798211A
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English (en)
Inventor
Staerck Thomas Henry
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.)
Teledyne UK Ltd
Original Assignee
English Electric Valve Co Ltd
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Filing date
Publication date
Application filed by English Electric Valve Co Ltd filed Critical English Electric Valve Co Ltd
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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
    • H01J23/36—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy
    • H01J23/40—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit
    • H01J23/42—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit the interaction circuit being a helix or a helix-derived slow-wave structure
    • 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
    • H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
    • H01J23/24—Slow-wave structures, e.g. delay systems
    • H01J23/26—Helical slow-wave structures; Adjustment therefor

Definitions

  • This invention relates to travelling wave electron discharge tubes and more specifically to such tubes of the kind in which an electron beam is projected axially down a delay winding which is coupled thereto.
  • travelling wave tubes are now well known and in fairly common use for microwave amplification and other purposes.
  • the delay winding which is usually a helix
  • a plurality of (for example three) insulating support rods which extend parallel to the axis and contact with the periphery of the winding along lines equally spaced around said periphery, and to hold the rods with gentle but firm pressure against the winding by means of specially formed clamps encircling the plurality of rods at spaced points in their lengths.
  • This type of construction has the defect that the clamps are troublesome to make and fit and even so are not always wholly satisfactory, since they provide clamping only at intervals along the lengths of the support rods.
  • Another known expedient for fixing the delay winding in position in a stable manner consists of pre-glazing the support rods, assembling them with the winding in a jig, and applying heat treatment to cause the glaze to flow in such a manner as to stick the turns of the winding to the rods.
  • This proposal is expensive to carry out and, moreover, may result in inacceptably increased radio frequency losses due to the glaze.
  • the object of the present invention is to provide simple and economical constructions for accurately locating the delay winding of a travelling wave tube of the kind referred to without incurring the defects of the known proposals above outlined.
  • a travelling wave electron discharge tube of the kind having a delay winding which is co-axial with the electron beam path of the tube is provided with a plurality of rods supporting said winding and in contact with the outside thereof along a plurality of lines distributed around the periphery thereof, and coiled strained metal spring means encircling said plurality of rods over at least a substantial proportion of the lengths thereof, said coiled metal spring means having, in the unstrained condition, a diameter less than that of a cylinder which would touch the peripheries of said rods, whereby spring force exerted by said coiled spring means presses said rods against said winding.
  • a travelling wave electron discharge tube of the kind having a delay helix which is co-axial with the electron beam path of the tube is provided with a plurality of rods supporting said helix and in contact with the outside thereof along a plurality of lines distributed around the periphery thereof, and at least one helically coiled strained spring in a diametrically strained condition encircling said plurality of rods over at least a substantial part of the lengths thereof, whereby said metal spring, due to its strain, presses ice said rods against said helix.
  • FIG- URE 1 is a schematic elevation, broken away centrally and at the ends, of the embodiment in question
  • FIGURE 2 is a sectional view at right angles to the view of FIGURE 1.
  • the travelling Wave tube therein partly represented has within a cylindrical envelope portion 1, shown broken away, a helical delay winding 2 between end members or so-called chokes 3.
  • the winding 2 co-axially surrounds the electron discharge path (not represented) which extends axially along inside the said winding in the customary manner.
  • the winding 2 is supported by three insulating rods 4, 5 and 6 spaced at 120 round the winding periphery and contacting it along three lines which are parallel to the axis. So as to simplify FIGURE 1, the rod 6 is not shown therein, only the rods 4 and 5 being shown.
  • the said rods are coated with graphite or other suitable resistance material over desired portions of their lengths to provide attenuation in accordance with well known travelling wave tube practice. Such graphite coating is indicated at 7 on the rod 4 only, it being not represented on the other rods, again for reasons of simplifying the drawing in FIGURE 1.
  • the rods 4, 5 and 6 are pressed inwardly on to the helix 2 by means of a coiled helical metal spring 8 long enough to extend at least over the greater part of the length of the helical winding 2 and having in its unstrained condition an internal diameter a little less than the diameter of the imaginary circle circumscribing the rods 4, 5 and 6 and to which these rods are internally tangential.
  • the spring 8 is represented as wound in the opposite direction to that of the helix 2 but of course this is not necessary and, indeed, it is in general preferred to have the helix 2 and the spring 8 wound in the same direction.
  • the rods 4, 5 and 6 are placed in position and the spring 8 is unwound a little so as to increase its internal diameter sufiiciently to allow it to he slipped over the said rods 4, 5 and 6. It is then released when in the required position. It will be appreciated that, when released, the spring will provide radially inward forces which press the rods 4, 5 and 6 inwardly against the helix 2 and position the latter with precision and in a stable manner. It will further be observed that the inward pressure forces applied by the spring 8 are, to a close degree of approximation, uniform over the whole length of the spring so that a very good and stable positioning and clamping action is obtained.
  • a travelling wave electron discharge tube of the kind having a delay winding which is co-axial with the electron beam path of the tube, said tube including a plurality of rods which support said delay winding and are in contact with the outside thereof along a plurality of lines extending parallel to the axis and equally spaced around the periphery thereof, and coiled strained metal spring means encircling said plurality of rods over the greater part of the length of said delay winding, said coiled spring means having, in the unstrained condition, a diameter less than its diameter which it adopts when encircling said rods, whereby spring force exerted by said A coiledspringmeans presses. said rods against said winding,
  • a travelling wave electron discharge tube of the kind having a delay helix which is co-axial with the electronbeam. path' of the tube said tube ,includingaplurality of rods supporting" said helix and in, contact with the outside thereof along aplur'ality. of linesextending parallel to the axis. and equally spaced around the periphery thereof,- and, at least one helically coiled strained metal spring in a diametricallystrained condition encircling said plurality of rods over the greater part of the length of said delay helix, whereby said spring, due to its strain; presses said rods'against said helix;

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  • Microwave Tubes (AREA)
US798211A 1958-03-18 1959-03-09 Travelling wave electron discharge tubes Expired - Lifetime US3026445A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8712/58A GB844332A (en) 1958-03-18 1958-03-18 Improvements in or relating to travelling wave electron discharge tubes

Publications (1)

Publication Number Publication Date
US3026445A true US3026445A (en) 1962-03-20

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ID=9857793

Family Applications (1)

Application Number Title Priority Date Filing Date
US798211A Expired - Lifetime US3026445A (en) 1958-03-18 1959-03-09 Travelling wave electron discharge tubes

Country Status (5)

Country Link
US (1) US3026445A (enrdf_load_stackoverflow)
DE (1) DE1191495B (enrdf_load_stackoverflow)
FR (1) FR1218978A (enrdf_load_stackoverflow)
GB (1) GB844332A (enrdf_load_stackoverflow)
NL (2) NL129302C (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3098169A (en) * 1960-02-08 1963-07-16 English Electric Valve Co Ltd Travelling wave tubes
US3209198A (en) * 1961-06-28 1965-09-28 Sylvania Electric Prod Resilient helix mount for traveling wave tube
US3271615A (en) * 1961-08-23 1966-09-06 Westinghouse Electric Corp Traveling wave electron discharge device having means exerting a radial force upon the envelope
US3308399A (en) * 1963-04-30 1967-03-07 Sylvania Electric Prod Helix bundle banding sleeve with integral outwardly projecting support fingers

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1309011A (fr) * 1961-01-02 1962-11-09 English Electric Valve Co Ltd Tubes à décharge d'électrons à ondes progressives
GB2296370B (en) * 1994-12-19 1998-07-29 Eev Ltd Travelling wave tubes

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR993491A (fr) * 1949-06-21 1951-10-31 Csf Dispositif d'attache de l'hélice et de ses supports dans les tubes à propagation d'onde linéaires
US2767344A (en) * 1949-12-30 1956-10-16 Bell Telephone Labor Inc Electronic amplifier
US2806170A (en) * 1953-09-30 1957-09-10 Rca Corp Traveling wave tube
FR1152970A (fr) * 1955-09-20 1958-02-27 Siemens Ag Conducteur de retardement, en particulier pour tubes à champ de déplacement
US2871393A (en) * 1954-09-16 1959-01-27 Int Standard Electric Corp Traveling wave tube of high amplification
US2876379A (en) * 1955-05-12 1959-03-03 Telefunken Gmbh Traveling wave tube structure

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2773213A (en) * 1951-03-13 1956-12-04 Rca Corp Electron beam tubes
GB786453A (en) * 1954-10-07 1957-11-20 Standard Telephones Cables Ltd Means and method of supporting the helix in travelling wave tubes

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR993491A (fr) * 1949-06-21 1951-10-31 Csf Dispositif d'attache de l'hélice et de ses supports dans les tubes à propagation d'onde linéaires
US2767344A (en) * 1949-12-30 1956-10-16 Bell Telephone Labor Inc Electronic amplifier
US2806170A (en) * 1953-09-30 1957-09-10 Rca Corp Traveling wave tube
US2871393A (en) * 1954-09-16 1959-01-27 Int Standard Electric Corp Traveling wave tube of high amplification
US2876379A (en) * 1955-05-12 1959-03-03 Telefunken Gmbh Traveling wave tube structure
FR1152970A (fr) * 1955-09-20 1958-02-27 Siemens Ag Conducteur de retardement, en particulier pour tubes à champ de déplacement
GB807357A (en) * 1955-09-20 1959-01-14 Siemens Ag Improvements in or relating to travelling-wave tubes

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3098169A (en) * 1960-02-08 1963-07-16 English Electric Valve Co Ltd Travelling wave tubes
US3209198A (en) * 1961-06-28 1965-09-28 Sylvania Electric Prod Resilient helix mount for traveling wave tube
US3271615A (en) * 1961-08-23 1966-09-06 Westinghouse Electric Corp Traveling wave electron discharge device having means exerting a radial force upon the envelope
US3308399A (en) * 1963-04-30 1967-03-07 Sylvania Electric Prod Helix bundle banding sleeve with integral outwardly projecting support fingers

Also Published As

Publication number Publication date
DE1191495B (de) 1965-04-22
GB844332A (en) 1960-08-10
FR1218978A (fr) 1960-05-13
NL129302C (enrdf_load_stackoverflow)
NL273040A (enrdf_load_stackoverflow)

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