US2536150A - Electrode system for trochotrons - Google Patents

Electrode system for trochotrons Download PDF

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Publication number
US2536150A
US2536150A US105406A US10540649A US2536150A US 2536150 A US2536150 A US 2536150A US 105406 A US105406 A US 105406A US 10540649 A US10540649 A US 10540649A US 2536150 A US2536150 A US 2536150A
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United States
Prior art keywords
electrodes
slit
electrode
electrode system
adjacent
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Expired - Lifetime
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US105406A
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English (en)
Inventor
Backmark Nils Erik Gustav
Jansson Karl Evert Ingemar
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/02—Cathode ray tubes; Electron beam tubes having one or more output electrodes which may be impacted selectively by the ray or beam, and onto, from, or over which the ray or beam may be deflected or de-focused
    • H01J31/06—Cathode ray tubes; Electron beam tubes having one or more output electrodes which may be impacted selectively by the ray or beam, and onto, from, or over which the ray or beam may be deflected or de-focused with more than two output electrodes, e.g. for multiple switching or counting
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J21/00—Vacuum tubes
    • H01J21/02—Tubes with a single discharge path
    • H01J21/18—Tubes with a single discharge path having magnetic control means; having both magnetic and electrostatic control means

Definitions

  • This invention relates to embodiments of electrodes in tubes of the type described in United States patent application of Alfven and Romanus, Serial No. 651,920, filed March 4, 1946, which issued as Patent Number 2,513,260 on June 27, 1950, and which are called trochotrons.
  • Such tubes contain a plurality of electrodes intended to receive or control, or both receive and control an electron current, the particular electrons of which are moving in a magnetic field in trochoidal paths.
  • Two adjacent electrodes of the mentioned kind may at suitable choice of the electrode voltage be hit each by itself or together by the electron beam, the path of which within the tube is determined by the present electric and magnetic fields.
  • the trochoidal movement of the particular electron consists of a translatory component and a circular movement superimposed thereon. In case of a homogeneous magnetic field the translatory movement will approximately follow an equipotential line through the tube and the radius of the circular component is a function of the strength of the electric and the magnetic field.
  • Such leakages can be avoided by arranging mica plates behind the electrodes as seen from the electron path, so that no openings between the electrodes are obtained.
  • the leakage can certainly be reduced in this way but the mica plates receive uncontrollable and unstable chargings through electrons impinging on the plates, which disturbs the function of the tube.
  • One of the adjacent electrodes is in the present invention preferably provided with a small edge bent along the other electrode at a certain distance from the same whereby the influence from said chargings is reduced and the field between the electrodes is made more easily controllable on that side of the electrodes, where the beam is.
  • the present invention relates to embodiments of adjacent electrodes, through which leak currents between the electrodes are prevented without such disturbing influences arising.
  • two adjacent electrodes which may be hit each by itself or simultaneously by the electron beam, are so shaped that a slit is formed between the parts of the adjacent electrodes lying close to each other, said slit having a length perpendicular to the magnetic field that is at least as great as the minimum distance between the electrodes.
  • Fig. 1 shows an embodiment of electrodes with a single slit between the electrodes
  • Fig. 2 an embodiment with a slit prolonged in angle and being especially suitable to prevent the scattering of secondary electrons. possibly released at the electrodes
  • Fig. 3 shows a labyrinthine embodiment of the slit betwee the electrodes suitable for the same purpose
  • Fig. 4 a modification of the embodiment according to the Figures 1 and 2 and Fig. 5 an electrode device, where the electron beam is completely caught because the contact electrode is performed as a V-shaped channel forming a pointed angle with adjacent electrodes.
  • Fig. 1 shows diagrammatically a trochotron consisting of a glass envelope I, an electron source consisting of a cathode 2 and an anode 3 and a number of electrodes intended to receive the electron current.
  • These electrodes are suitably arranged in such a way that they form open bottom boxes the tops of which consist of electrodes 4'44" etc., the so-called contact electrodes and the sides of which are formed by electrodes, so-called spades 5'5"5 etc., arranged mainly perpendicularly to the contact electrodes.
  • the electrodes 4' 4" etc. are at their edges adjacent to the electrodes 5 and 5 etc., respectively, provided with a lap or flange 9 so performed that a slit arises between the electrodes, the width of which is indicated by b and the length or depth of which perpendicular to the magnetic field and parallel with the adjoining ed es is indicated by I.
  • an intermediate contact electrode 4 in which boxes the electron beam has to come to be able to hit the contact electrode or some other electrode not indicated here, without being disturbed by the spades, it is not suitable to choose the radius of the circular movement too great and thus not the width of the slit too great either.
  • a good result may be achieved, if the slit is only performed with a minimum width b, which is less than of the distance between two adjacent spades.
  • FIGS. 2 and 3 show other embodiments giving further safety as to the avoidance of stray electrons, especially with regard to secondary electrons, which may be'released at the electrodes when these are hit by the electron beam.
  • FIG. 4 the contact electrodes are performed with a rather great radius of curvature in the part between the flange 9 and the remaining part of the electrodes 4', 4" etc.
  • the electrodes 4 are channel shaped and form a pointed angle with an adjacent electrode. Practically all the electrons coming into a box, are caught by one of those electrodes which form a pointed angle with one another, provided that the width b indicated in the figure is less than (1/4.
  • An electrode system for trochotrons comprising in combination, a plurality of receiving electrodes for the trochoidal electron beam, each two adjacent electrodes subject individually or jointly to being struck by the electron beam being separated by a slit between parts of the electrodes lying close to each other, each of said electrodes bordering said slit having a portion thereof directed generally in the direction of the depth of the slit and perpendicular to the magnetic field, said portion being of such dimension and the electrode spacing being such that the depth of the slit is at least as great as its width.
  • An electrode system for trochotrons comprising in combination, a plurality of sequentially arranged and spaced receiving electrodes for the trochoidal electron beam, each two adjacent electrodes subject individually or jointly to being struck by the electron beam being separated by a slit of substantially uniform Width throughout its length between parts of the electrodes lying close to each other, each of said electrodes bordering said slit having a portion thereof directed generally in the direction of the depth of the slit and perpendicular to the magnetic field, said portion being of such dimension and the electrode spacing being such that the depth of the slit is at least as great as its width.

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  • Electron Sources, Ion Sources (AREA)
  • Particle Accelerators (AREA)
  • Cold Cathode And The Manufacture (AREA)
US105406A 1948-07-19 1949-07-18 Electrode system for trochotrons Expired - Lifetime US2536150A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE274996X 1948-07-19

Publications (1)

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US2536150A true US2536150A (en) 1951-01-02

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US (1) US2536150A (xx)
BE (1) BE490233A (xx)
CH (1) CH274996A (xx)
DE (1) DE860834C (xx)
FR (1) FR1004598A (xx)
GB (1) GB675490A (xx)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2680823A (en) * 1949-07-07 1954-06-08 Csf Electron optic device for a beam propagating perpendicularly to crossed magnetic and electric fields
US2721955A (en) * 1953-07-24 1955-10-25 Burroughs Corp Multi-position beam tube
US2755412A (en) * 1951-07-05 1956-07-17 Ericsson Telefon Ab L M Electron valve
US2839702A (en) * 1953-07-24 1958-06-17 Burroughs Corp Modulated distribution system
US2880356A (en) * 1953-02-23 1959-03-31 Csf Linear accelerator for charged particles
US2903620A (en) * 1957-08-28 1959-09-08 Sylvania Electric Prod Microwave tube
US2903619A (en) * 1957-08-28 1959-09-08 Sylvania Electric Prod Microwave tube
US2992360A (en) * 1953-05-13 1961-07-11 Csf Suppressor device for the secondary emission current in magnetic field electronic tubes

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104183443B (zh) * 2014-08-13 2016-10-05 俞权锋 一种高压静电放电管

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2293567A (en) * 1940-06-27 1942-08-18 Bell Telephone Labor Inc Electron dischrage apparatus
US2414121A (en) * 1941-01-17 1947-01-14 Bell Telephone Labor Inc Electron device of the magnetron type

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2293567A (en) * 1940-06-27 1942-08-18 Bell Telephone Labor Inc Electron dischrage apparatus
US2414121A (en) * 1941-01-17 1947-01-14 Bell Telephone Labor Inc Electron device of the magnetron type

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2680823A (en) * 1949-07-07 1954-06-08 Csf Electron optic device for a beam propagating perpendicularly to crossed magnetic and electric fields
US2755412A (en) * 1951-07-05 1956-07-17 Ericsson Telefon Ab L M Electron valve
US2880356A (en) * 1953-02-23 1959-03-31 Csf Linear accelerator for charged particles
US2992360A (en) * 1953-05-13 1961-07-11 Csf Suppressor device for the secondary emission current in magnetic field electronic tubes
US2721955A (en) * 1953-07-24 1955-10-25 Burroughs Corp Multi-position beam tube
US2839702A (en) * 1953-07-24 1958-06-17 Burroughs Corp Modulated distribution system
US2903620A (en) * 1957-08-28 1959-09-08 Sylvania Electric Prod Microwave tube
US2903619A (en) * 1957-08-28 1959-09-08 Sylvania Electric Prod Microwave tube

Also Published As

Publication number Publication date
FR1004598A (fr) 1952-03-31
BE490233A (xx)
CH274996A (de) 1951-04-30
GB675490A (en) 1952-07-09
DE860834C (de) 1952-12-22

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