US2283004A - Electron multiplier - Google Patents

Electron multiplier Download PDF

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Publication number
US2283004A
US2283004A US292632A US29263239A US2283004A US 2283004 A US2283004 A US 2283004A US 292632 A US292632 A US 292632A US 29263239 A US29263239 A US 29263239A US 2283004 A US2283004 A US 2283004A
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US
United States
Prior art keywords
grid
electrons
electrode
cathode
electrodes
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
US292632A
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English (en)
Inventor
Gebauer Rudolf
Traubenbe Heinrich Freiher Von
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.)
Alcatel Lucent Deutschland AG
C Lorenz AG
Original Assignee
Standard Elektrik Lorenz AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
Application granted granted Critical
Publication of US2283004A publication Critical patent/US2283004A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J43/00—Secondary-emission tubes; Electron-multiplier tubes
    • H01J43/04—Electron multipliers
    • H01J43/28—Vessels, e.g. wall of the tube; Windows; Screens; Suppressing undesired discharges or currents

Definitions

  • the chief problem therefore is to prevent the volatilization products from reaching the impact electrodes and thereby to insure that only the electrons shall arrive at these.
  • the invention provides an arrangement in which the volatilization products emanating from a thermal source of electrons are caught by a suitablyshaped grid, whilst the electrons are by a magnetic field caused to avoid such cathing grid and hence to arrive at the impact electrodes.
  • the volatilization products are not deflected by the magnetic field. Even if electrically charged, their rectilinear path will be affected by a magnetic eld to a very slight extent only as compared with the electrons, because the mass or substance of these is very much smaller than that of the volatiliza-v tion products.
  • a suppressor grid may be arranged to neutralize the secondary electrons arising at the catching grid.
  • the number of such impact electrodes is suited to the special conditions of each case.
  • FIG. 1 is a diagrammatic cross-sectional view showing one embodiment of the invention
  • Fig 2 is a View similar to Fig. l and illustrating a second embodiment thereof.
  • K denotes a directly or indirectly heated glowing cathode surrounded with a control grid I 2, 3 designate grids which comprise tapes arranged parallel to the cathode K. These grids are of the same positive potential with respect to the cathode and constitute the catching grid which, as stated, is designed to catch the Volatilization products emanating from the cathode in ous, as will be clear.
  • grid 3 which in the present special case also acts as a screening grid in a manner similar to the usual amplifying tubes, is concentrically encircled with impact electrodes 4, 5, 6 A.
  • the positive potential increases from electrode to electrode, that is to say, electrode 4 has a higher positive potential than grid 2, 3, while electrode 5 is of a higher positive potential than is electrode 4, and so on.
  • the last electrode, that is, the catching anode A, is thus given the highest positive potential.
  • the electrodes 4, 5, 6 vto A are made of a line-meshed wire gauze, for instance, and are covered with a layer of high secondary-emission material.
  • the collector electrode A may be substantially continucathode K.
  • the catching grid 2, 3 represented in Fig. l may be replaced by the grid 2' illustrated in Fig. 2.
  • Suchgrid is shown here as used in connec tion with a pentode, for example, the anode cur-y rent of which is amplied by secondary electrons arising at concentrically arranged electrodes in the manner before described.
  • the grid 2' is of tubular shape and is composed of tapes which are parallel to the cathode K These tapes, vhow- The catching In order to aid the elec-l field.
  • a suppressor grid 3a is located between grid 2 and electrode 4.
  • Grid 3a may be connected to the Alsor in the case ofv Vcontrol grid surrounding said cathode, means for emitting secondary electrons under the impact of electrons arriving from said cathode, means including two electrically connected generally cylindrical parts encircling the cathode, each of said parts having openings which coincide in radial direction with the wall portions of the other part, and means for producing a magnetic field in said multiplier said field for directing the cathode ⁇ electrons through the said openings against the means for secondary emission.

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  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US292632A 1938-08-30 1939-08-30 Electron multiplier Expired - Lifetime US2283004A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE212042X 1938-08-30

Publications (1)

Publication Number Publication Date
US2283004A true US2283004A (en) 1942-05-12

Family

ID=5805986

Family Applications (1)

Application Number Title Priority Date Filing Date
US292632A Expired - Lifetime US2283004A (en) 1938-08-30 1939-08-30 Electron multiplier

Country Status (3)

Country Link
US (1) US2283004A (de)
CH (1) CH212042A (de)
FR (1) FR859420A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3436590A (en) * 1966-03-02 1969-04-01 Itt Electron multiplier
US20040263050A1 (en) * 2003-04-04 2004-12-30 Thales Electron tube control grid

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3436590A (en) * 1966-03-02 1969-04-01 Itt Electron multiplier
US20040263050A1 (en) * 2003-04-04 2004-12-30 Thales Electron tube control grid
US7327077B2 (en) * 2003-04-04 2008-02-05 Thales Electron tube control grid

Also Published As

Publication number Publication date
FR859420A (fr) 1940-12-18
CH212042A (de) 1940-10-31

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