US3588563A - Arrangement of a high vacuum electronic discharge tube provided with a getter ion pump operating in magnetic fields - Google Patents

Arrangement of a high vacuum electronic discharge tube provided with a getter ion pump operating in magnetic fields Download PDF

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Publication number
US3588563A
US3588563A US800643A US3588563DA US3588563A US 3588563 A US3588563 A US 3588563A US 800643 A US800643 A US 800643A US 3588563D A US3588563D A US 3588563DA US 3588563 A US3588563 A US 3588563A
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Prior art keywords
ion pump
high vacuum
discharge tube
electronic discharge
arrangement
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Expired - Lifetime
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US800643A
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English (en)
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Wolfgang Schmidt
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US Philips Corp
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US Philips Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J41/00—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas; Discharge tubes for evacuation by diffusion of ions
    • H01J41/12—Discharge tubes for evacuating by diffusion of ions, e.g. ion pumps, getter ion pumps
    • H01J41/18—Discharge tubes for evacuating by diffusion of ions, e.g. ion pumps, getter ion pumps with ionisation by means of cold cathodes
    • H01J41/20—Discharge tubes for evacuating by diffusion of ions, e.g. ion pumps, getter ion pumps with ionisation by means of cold cathodes using gettering substances
    • 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

Definitions

  • the invention relates to a high vacuum electronic discharge tube operating in a magnetic field generated by columns of permanent magnets outside the tube, which tube is provided with a getter ion pump operating also in a magnetic field.
  • Getter ion pumps are connected to high vacuum discharge tubes to keep the gas pressure within the tube as low as possible.
  • Microwave discharge tubes have comparatively heavy metal parts, from which under the influence of the discharge, occluded gas is set free. This gas not only may poison the cathode or disintegrate it, but the ions may also influence the working of the tube by their oscillations, which among others contribute to noise. In beam tubes the ions may give rise to such a contraction of the electron beam, that the collector electrode locally melts and evaporates.
  • the problem for the tube manufacturer is however how to combine the tube and the getter ion pump and their magnetic fields.
  • Klystrons with magnetic fields generated by columns of permanent magnets as shown in FIG. 4 of the German Pat. No. l,l5 8,1 83 operate with a rather low intensity of the magnetic field. Due to this the stray field is not sufficient for the accommodation of a getter ion pump. Also when such magnets are used for magnetron tubes requiring a less intense magnetic field the intensity of the stray field is not sufl'icient for a getter ion pump.
  • the invention aims at a solution for this problem.
  • the getter ion pump is arranged in one of the columns of permanent magnets, such that at least part of the flux lines of the main magnetic field of the tube house the getter ion pump.
  • the intensity of the magnetic field in the getter ion pump will obtain a higher value than if it were arranged in the stray field.
  • FIG. I is a view of one section of a power klystron partly cut away from which section FIG. 2 is a top view.
  • FIG. 3 is a side view of a magnetron according to the invention and FIG. 4 a top view.
  • FIGS. 1 and 2 I designates drift tubes of a klystron defining an interaction gap 2. Ceramic tubes 3 with copper flanges 4 define the vacuum chamber. Cavity resonators may be attached to flanges 4. Pole plates 5 connect columns 7 of permanent magnet discs 6. Pole plates 5 bear pole shoes 8. In FIG. I the left column 7 has in the middle thereof a soft magnetic disc 9. In the right column 7 instead of the disc 9 a getter ion pump I0 is arranged connected by the pump lead 11 to the drift tubes I. On both sides of the pump lead 11, cooling fins 2 are arranged. If desired a second pump can be provided for reason of symmetry in another column.
  • FIGS. 3 and 4 iffer from FIGS. I and 2 in that only two columns 7 are provided.
  • the pole plates 5 bear poles l7 arranged in the anode body l5.
  • I3 is the cathode insulator and 14 the cathode lead.
  • l6 denotes the output lead.
  • a high vacuum electronic discharge tube comprising an envelope containing electrodes for producing and controlling electron beams, columns of permanent magnetic discs external to said envelope to produce a magnetic field for interaction with said beams and an ion pump connected to said envelope to reduce gas pressure within said envelope, said ion pump being arranged within one of said columns whereby at least part of the flux lines of said magnetic field passes through said ion pump.
  • a high vacuum electronic discharge tube as claimed in claim I further comprising an intermediate part of desired magnetic characteristics having substantially the same dimension as said ion pump arranged within one of the other columns to compensate for any asymmetry caused by said ion pump.
  • a high vacuum electronic discharge tube as claimed in claim I further comprising ion pumps arranged within two or more symmetrical columns.
  • Figure 2 shows how four columns 7 are arranged.

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  • Microwave Tubes (AREA)
  • Particle Accelerators (AREA)
US800643A 1968-02-28 1969-02-19 Arrangement of a high vacuum electronic discharge tube provided with a getter ion pump operating in magnetic fields Expired - Lifetime US3588563A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681639370 DE1639370A1 (de) 1968-02-28 1968-02-28 Hochvakuumelektronenroehre mit Ionengetterpumpe

Publications (1)

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US3588563A true US3588563A (en) 1971-06-28

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US800643A Expired - Lifetime US3588563A (en) 1968-02-28 1969-02-19 Arrangement of a high vacuum electronic discharge tube provided with a getter ion pump operating in magnetic fields

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US (1) US3588563A (de)
DE (1) DE1639370A1 (de)
FR (1) FR2002826A1 (de)
GB (1) GB1196233A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3794879A (en) * 1972-10-24 1974-02-26 Raytheon Co Microwave magnetron
US4167370A (en) * 1976-11-01 1979-09-11 Massachusetts Institute Of Technology Method of an apparatus for self-sustaining high vacuum in a high voltage environment
EP0257394A1 (de) * 1986-08-20 1988-03-02 Kabushiki Kaisha Toshiba Elektronenstrahlgerät
US5655886A (en) * 1995-06-06 1997-08-12 Color Planar Displays, Inc. Vacuum maintenance device for high vacuum chambers
US6149392A (en) * 1997-10-15 2000-11-21 Saes Getters S.P.A. Getter pump with high gas sorption velocity
US9136794B2 (en) 2011-06-22 2015-09-15 Research Triangle Institute, International Bipolar microelectronic device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3794879A (en) * 1972-10-24 1974-02-26 Raytheon Co Microwave magnetron
US4167370A (en) * 1976-11-01 1979-09-11 Massachusetts Institute Of Technology Method of an apparatus for self-sustaining high vacuum in a high voltage environment
EP0257394A1 (de) * 1986-08-20 1988-03-02 Kabushiki Kaisha Toshiba Elektronenstrahlgerät
US4890029A (en) * 1986-08-20 1989-12-26 Kabushiki Kaisha Toshiba Electron beam apparatus including plurality of ion pump blocks
US5021702A (en) * 1986-08-20 1991-06-04 Kabushiki Kaisha Toshiba Electron beam apparatus including a plurality of ion pump blocks
US5655886A (en) * 1995-06-06 1997-08-12 Color Planar Displays, Inc. Vacuum maintenance device for high vacuum chambers
US6149392A (en) * 1997-10-15 2000-11-21 Saes Getters S.P.A. Getter pump with high gas sorption velocity
US9136794B2 (en) 2011-06-22 2015-09-15 Research Triangle Institute, International Bipolar microelectronic device

Also Published As

Publication number Publication date
GB1196233A (en) 1970-06-24
FR2002826A1 (de) 1969-10-31
DE1639370A1 (de) 1971-02-04

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