US2895066A - Traveling wave tube - Google Patents

Traveling wave tube Download PDF

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Publication number
US2895066A
US2895066A US526651A US52665155A US2895066A US 2895066 A US2895066 A US 2895066A US 526651 A US526651 A US 526651A US 52665155 A US52665155 A US 52665155A US 2895066 A US2895066 A US 2895066A
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United States
Prior art keywords
traveling wave
tube
sleeve
magnets
magnetic
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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
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US526651A
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English (en)
Inventor
Yasuda Susumu
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International Standard Electric Corp
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International Standard Electric Corp
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Publication date
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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
    • H01J23/08—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

  • a predominant characteristic of tube construction using such an alternating magnetic field is that the traveling wave tube device can be shortened remarkably in comparison with one using an homogenous field. Furthermore, when the field excitation is made by permanent magnets the weight can be reduced about one thirtieth in comparison with the case where focussing electro-magnetic coil which would produce an homogenous field is used.
  • the present invention provides a simple additional device to adjust mechanically such critical characteristics, and to thus avoid the difficulties resulting from the close mechanical tolerance otherwise required.
  • voltages of several thousand volts may be impressed on the helix electrode and a slight variation of penetration factor will cause burning out of the helical electrode making the tube life very short.
  • Fig. 1 shows a relation between magnetic induction B max. and an electron beam penetration factor of a tube, in the case where an alternating magnetic field is used for electron focussing and;
  • Fig. 2 represents a partial sectional view used to explain a practical example of the invention.
  • Fig. 2 there is shown at 1 a portion of a traveling wave tube envelope and a diagram of the helical electrode mounted therein.
  • the cathode electrode, collector electrode and associated input and output couplers are not shown since they are not necessary to an illustration of this invention.
  • Coaxially of tube 1 are provided permanent magnets 2 of annular form all positioned so as to have their poles aligned in alternately opposite directions along the length of the envelope. Magnets 2 are all of the same length and interposed between each of the magnets are provided annular pole piece members 3 having external diameters coinciding substantially with the external diameters of the magnets 2 and inner diameters fitting closely to the envelope of ice tube 1. This construction provides an approximate sine wave distribution of magnetic field axially along the length of tube 1.
  • a sleeve 4 of non-magnetic material is mounted outside the magnet and yoke assembly 2, 3, and of such dimensions that it may be slid axially along the length of the assembly.
  • this outer sleeve are provided grooves 5 which may be threaded and engaging the threaded portions are rings 6 of magnetic material of high permeability, such as iron, and designed so that they may be adjusted lengthwise of the grooves by the screw thread adjustment.
  • the value of the maxima along the line may be adjusted to correct for this factor.
  • the maxima as illustrated by a and b on the central graph of Fig. 1, can be adjusted to its most desirable position by movement of the sleeve 4 and the threaded shunting element 6 longitudinally of the magnetic structure.
  • rings 6 produce a partial bypassing of the magnetic field external of the tube structure in accordance with the longitudinal position of these rings with respect to the ends or poles of the associated magnets 2.
  • the proper distribution of the magnetic field with the tube may be achieved even if the mechanical assembly has not been precisely made.
  • a structure for focussing an electron beam over a relatively long path comprising an assembly of a plurality of permanent magnets positioned end-to-end along said path and with the poles aligned in alternately opposite directions and magnetic permeable elements between the ends of adjacent magnets and surrounding said path whereby a magnetic field is produced longitudinally of said beam path having effective undulations of concentration along said path, characterized by means for controlling said undulations comprising, magnetically permeable members for each magnet external of the assembly of said magnets and permeable elements, means for mounting said members closely adjacent to respective magnets and intermediate the ends thereof and means for simultaneously moving said members along the length of each magnet.
  • said permanent magnets are annular in shape and positioned to surround said beam path, and said elements each are annular with an outer periphery substantially the same as the outer periphery of said magnets and with an inner periphery substantially smaller than the inner periphery of said magnets, characterized in that said members are ring shaped and coaxial of said magnet and said means for mounting said members comprises a sleeve of non-magnetic material slidable on the outer periphery of said permanent magnets.
  • a structure according to claim 2 further characterized in that said rings are provided with means for individual longitudinal adjustment of said rings relative to said sleeve.

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  • Microwave Tubes (AREA)
  • Particle Accelerators (AREA)
US526651A 1954-10-04 1955-08-05 Traveling wave tube Expired - Lifetime US2895066A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP336511X 1954-10-04

Publications (1)

Publication Number Publication Date
US2895066A true US2895066A (en) 1959-07-14

Family

ID=12392336

Family Applications (1)

Application Number Title Priority Date Filing Date
US526651A Expired - Lifetime US2895066A (en) 1954-10-04 1955-08-05 Traveling wave tube

Country Status (5)

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US (1) US2895066A (en:Method)
CH (1) CH336511A (en:Method)
DE (1) DE1057244B (en:Method)
GB (1) GB792020A (en:Method)
NL (1) NL200862A (en:Method)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2965782A (en) * 1958-03-12 1960-12-20 English Electric Valve Co Ltd Magnetic focusing systems for travelling wave tubes
US3061754A (en) * 1960-03-18 1962-10-30 Gen Precision Inc Temperature compensating element for a traveling wave tube periodic array
US3106659A (en) * 1959-03-24 1963-10-08 Kearfott Company Inc Microwave tube construction
US3178602A (en) * 1960-12-30 1965-04-13 Gen Precision Inc Adjustable permanent magnet focusing array

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1491388B1 (de) * 1964-12-10 1970-01-15 Philips Patentverwaltung Klystron,vorzugsweise Hochleistungsmehrkammerklystron,mit mindestens einem einstellbare magnetische Nebenanschluesse aufweisenden Dauermagnetsystem

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2200039A (en) * 1937-11-01 1940-05-07 Emi Ltd Permanent magnet device for producing axially symmetrical magnetic fields
US2212206A (en) * 1936-10-30 1940-08-20 Rca Corp Electron device
US2431077A (en) * 1943-08-31 1947-11-18 Rca Corp Cathode-ray tube with revolving magnets and adjustable sleeve
US2442975A (en) * 1943-08-31 1948-06-08 Rca Corp Focusing system
FR1080230A (fr) * 1952-07-01 1954-12-07 Philips Nv Dispositif de concentration magnétique pour faisceaux électroniques
US2741718A (en) * 1953-03-10 1956-04-10 Sperry Rand Corp High frequency apparatus
US2790920A (en) * 1955-05-09 1957-04-30 Philco Corp Apparatus for control of electron beam cross section
US2797360A (en) * 1953-03-26 1957-06-25 Int Standard Electric Corp Travelling wave amplifiers
US2812470A (en) * 1954-10-22 1957-11-05 Bell Telephone Labor Inc Periodic focusing in traveling wave tubes

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2212206A (en) * 1936-10-30 1940-08-20 Rca Corp Electron device
US2200039A (en) * 1937-11-01 1940-05-07 Emi Ltd Permanent magnet device for producing axially symmetrical magnetic fields
US2431077A (en) * 1943-08-31 1947-11-18 Rca Corp Cathode-ray tube with revolving magnets and adjustable sleeve
US2442975A (en) * 1943-08-31 1948-06-08 Rca Corp Focusing system
FR1080230A (fr) * 1952-07-01 1954-12-07 Philips Nv Dispositif de concentration magnétique pour faisceaux électroniques
US2741718A (en) * 1953-03-10 1956-04-10 Sperry Rand Corp High frequency apparatus
US2797360A (en) * 1953-03-26 1957-06-25 Int Standard Electric Corp Travelling wave amplifiers
US2812470A (en) * 1954-10-22 1957-11-05 Bell Telephone Labor Inc Periodic focusing in traveling wave tubes
US2790920A (en) * 1955-05-09 1957-04-30 Philco Corp Apparatus for control of electron beam cross section

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2965782A (en) * 1958-03-12 1960-12-20 English Electric Valve Co Ltd Magnetic focusing systems for travelling wave tubes
US3106659A (en) * 1959-03-24 1963-10-08 Kearfott Company Inc Microwave tube construction
US3061754A (en) * 1960-03-18 1962-10-30 Gen Precision Inc Temperature compensating element for a traveling wave tube periodic array
US3178602A (en) * 1960-12-30 1965-04-13 Gen Precision Inc Adjustable permanent magnet focusing array

Also Published As

Publication number Publication date
GB792020A (en) 1958-03-19
DE1057244B (de) 1959-05-14
CH336511A (de) 1959-02-28
NL200862A (en:Method)

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