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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United States
Prior art keywords
ion source
grid
discharge
high frequency
electrode
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Expired - Lifetime
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US718047A
Inventor
Robert Evrard
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US Philips Corp
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US Philips Corp
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Publication date
Priority claimed from FR101901A external-priority patent/FR1518219A/en
Application filed by US Philips Corp filed Critical 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
    • 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)

Description

- 1970 R. EVRARD HIGH FREQUENCY ION SOURCE FORMED BY A DISCHARGE BETWEEN A SECONDARY-EMITTING ELECTRODE AND A GRID Filed April 2, 1968 I N VENTOR. ROBERT EVRARD AGE United States Patent Oifice 3,532,915 Patented Oct. 6, 1970 U.S. Cl. 313-63 1 Claim ABSTRACT OF THE DISCLOSURE In a high-frequency ion source the discharge takes place between a secondary-emitting electrode and a grid be tween which a high-frequency field is set up and in which the secondary electrons return again to the electrode in one cycle.
The invention relates to an ion source, in which ions are formed in a high-frequency electric field.
In the known ion sources, 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.
It is the object of the invention to provide a more favourable arrangement.
According to the invention, in an ion source in which ions are formed in a high-frequency electric discharge, said electric discharge occurs between two electrodes one of which is secondary-emitting and invention, a pressure lower than, for example, 10 Torr is no objection for maintaining the electron production and therewith the ionisation of the gas.
In order that the invention may be readily carried into effect, it will now be described in greater detail, by way of example, with reference to the accompanying drawing, which digrammatically shows a cross-sectional view of an electrode arrangement for an ion source according to the invention.
Referring now to the figure, 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. In the space between the electrodes 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.
What is claimed is:
1. 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.
References Cited UNITED STATES PATENTS 10/1960 Heil ct al. 313-63 10/1951 Hernquist 2504l.9
US. Cl. X.R. 3 l3103
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 (en) 1966-04-09 1967-04-07 Device for recording and reproducing a color television signal

Publications (1)

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

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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

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US (1) US3532915A (en)
DE (1) DE1764098A1 (en)
GB (1) GB1225674A (en)
NL (1) NL6804401A (en)

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 (en) * 1983-08-12 1985-12-06 Centre Nat Rech Scient ION SOURCE HAS AT LEAST TWO IONIZATION CHAMBERS, PARTICULARLY FOR THE FORMATION OF CHEMICALLY REACTIVE ION BEAMS

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
GB1225674A (en) 1971-03-17
DE1764098A1 (en) 1971-04-22
NL6804401A (en) 1968-10-08

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