US3532915A - High frequency ion source formed by a discharge between a secondary-emitting electrode and a grid - Google Patents

High frequency ion source formed by a discharge between a secondary-emitting electrode and a grid Download PDF

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Publication number
US3532915A
US3532915A US718047A US3532915DA US3532915A US 3532915 A US3532915 A US 3532915A US 718047 A US718047 A US 718047A US 3532915D A US3532915D A US 3532915DA US 3532915 A US3532915 A US 3532915A
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US
United States
Prior art keywords
ion source
grid
discharge
high frequency
electrode
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
US718047A
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English (en)
Inventor
Robert Evrard
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.)
US Philips Corp
Original Assignee
US Philips Corp
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
Priority claimed from FR101901A external-priority patent/FR1518219A/fr
Application filed by US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3532915A publication Critical patent/US3532915A/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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J27/00—Ion beam tubes
    • H01J27/02—Ion sources; Ion guns
    • H01J27/16—Ion sources; Ion guns using high-frequency excitation, e.g. microwave excitation
    • 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

Definitions

  • the invention relates to an ion source, in which ions are formed in a high-frequency electric field.
  • the high-frequency discharge takes place in a space which has a higher pressure than the acceleration space because otherwise insufficient ions are formed. This necessitates the maintenance of a continuous gas flow from the ionization space to the acceleration space. This involves that in general only small ion extraction apertures can be used and that the efiiciency of said ion sources is comparatively low.
  • a pressure lower than, for example, 10 Torr is no objection for maintaining the electron production and therewith the ionisation of the gas.
  • reference numeral 1 denotes a hollow electrode, radius 12 cm., the surface of which consists of oxidized silver.
  • 2 is a copper grid having wide meshes and arranged concentrically with l, radius 9 cm.
  • An extra electrode 3 is arranged in the centre of 1 and 2 and is supported by a quartz plate 4.
  • An accelerating electrode is denoted by 5.
  • a deuterium-tritium mixture is provided at a pressure of IO- torr.
  • An alternating voltage from source 6 of approximately 40 mc./s. and v. amplitude is set up between the electrodes 1 and 2.
  • Electrode 1 is 500 volts negative with respect to 2.
  • 5 may be a few tens of kv. negative with respect to 3.
  • Ions formed in the space between 1 and 2 are introduced into the accelerating space of electrode 5, through electrode 3, The arrangement is suitable for a neutron generator.
  • An ion source comprising two spaced electrodes defining a region filled with a gas forming ions during an electrical discharge; one of said electrodes being secondary-emitting and the other grid-like, and means to produce a high-frequency electric field between said electrodes having an amplitude and frequency such that emitted secondary electrons return again to the secondaryemitting electrode after one cycle.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Electron Sources, Ion Sources (AREA)
US718047A 1967-04-07 1968-04-02 High frequency ion source formed by a discharge between a secondary-emitting electrode and a grid Expired - Lifetime US3532915A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR101901A FR1518219A (fr) 1966-04-09 1967-04-07 Dispositif d'enregistrement et de reproduction d'un signal de télévision en couleurs

Publications (1)

Publication Number Publication Date
US3532915A true US3532915A (en) 1970-10-06

Family

ID=8628387

Family Applications (1)

Application Number Title Priority Date Filing Date
US718047A Expired - Lifetime US3532915A (en) 1967-04-07 1968-04-02 High frequency ion source formed by a discharge between a secondary-emitting electrode and a grid

Country Status (4)

Country Link
US (1) US3532915A (enrdf_load_stackoverflow)
DE (1) DE1764098A1 (enrdf_load_stackoverflow)
GB (1) GB1225674A (enrdf_load_stackoverflow)
NL (1) NL6804401A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4675145A (en) * 1984-08-16 1987-06-23 The United State Of America As Represented By The United States Department Of Energy Magnetically insulated diode for generating pulsed neutron and gamma ray emissions
US6441569B1 (en) 1998-12-09 2002-08-27 Edward F. Janzow Particle accelerator for inducing contained particle collisions

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2550681B1 (fr) * 1983-08-12 1985-12-06 Centre Nat Rech Scient Source d'ions a au moins deux chambres d'ionisation, en particulier pour la formation de faisceaux d'ions chimiquement reactifs

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2570124A (en) * 1949-10-20 1951-10-02 Rca Corp Positive ion beam gun
US2956192A (en) * 1959-01-02 1960-10-11 Eitel Mccullough Inc Gettering electron gun

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2570124A (en) * 1949-10-20 1951-10-02 Rca Corp Positive ion beam gun
US2956192A (en) * 1959-01-02 1960-10-11 Eitel Mccullough Inc Gettering electron gun

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4675145A (en) * 1984-08-16 1987-06-23 The United State Of America As Represented By The United States Department Of Energy Magnetically insulated diode for generating pulsed neutron and gamma ray emissions
US6441569B1 (en) 1998-12-09 2002-08-27 Edward F. Janzow Particle accelerator for inducing contained particle collisions

Also Published As

Publication number Publication date
NL6804401A (enrdf_load_stackoverflow) 1968-10-08
GB1225674A (enrdf_load_stackoverflow) 1971-03-17
DE1764098A1 (de) 1971-04-22

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