EP0130907A1 - Verfahren zur Erzeugung mehrfach geladener Ionen - Google Patents

Verfahren zur Erzeugung mehrfach geladener Ionen Download PDF

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Publication number
EP0130907A1
EP0130907A1 EP84401359A EP84401359A EP0130907A1 EP 0130907 A1 EP0130907 A1 EP 0130907A1 EP 84401359 A EP84401359 A EP 84401359A EP 84401359 A EP84401359 A EP 84401359A EP 0130907 A1 EP0130907 A1 EP 0130907A1
Authority
EP
European Patent Office
Prior art keywords
gas
oxygen
enclosure
nitrogen
neutral atoms
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.)
Granted
Application number
EP84401359A
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English (en)
French (fr)
Other versions
EP0130907B1 (de
Inventor
Bernard Jacquot
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
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Filing date
Publication date
Application filed by Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP0130907A1 publication Critical patent/EP0130907A1/de
Application granted granted Critical
Publication of EP0130907B1 publication Critical patent/EP0130907B1/de
Expired legal-status Critical Current

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    • 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
    • H01J27/18—Ion sources; Ion guns using high-frequency excitation, e.g. microwave excitation with an applied axial magnetic field

Definitions

  • the subject of the present invention is a method for producing multicharged ions and a source of multicharged ions operating in impulse mode, enabling the method to be implemented.
  • Such an ion source can be used in short pulse mode, in particular to equip certain particle accelerators, of the synchrotron type. for example, which require only an ion current pulse with a duration of the order of a few tens of microseconds in an interval of the order of one second.
  • the intensity of the multicharged ion currents which can be extracted from these sources is insufficient for certain applications, and in particular in the biomedical field, and for the equipment of particle accelerators.
  • the present invention aims to remedy these drawbacks. For this, it provides for the use of a well-defined mixture of gases which is introduced into the cavity of an ion source.
  • the present invention specifically relates to a process for producing multicharged ions by ionization of a first gas consisting of the elements chosen from the group comprising carbon, nitrogen, oxygen, neon, argon and krypton. , introduced into the enclosure of an ion source operating in pulsed mode, characterized in that a second gas is introduced into the enclosure of the ion source, this second gas being helium when it is desired to ionize neutral atoms of carbon (obtained from CO 2 ), nitrogen, oxygen or neon, and nitrogen or oxygen when it is desired to ionize neutral atoms of argon or krypton.
  • a first gas consisting of the elements chosen from the group comprising carbon, nitrogen, oxygen, neon, argon and krypton.
  • a second gas to the gas to be ionized makes it possible to increase the current intensity of the ions formed by about a factor of ten compared to the use of the single gas to be ionized.
  • the first gas consisting of neutral atoms of carbon, nitrogen, oxygen, neon or argon
  • the second gas is introduced into L ' enclosure in a proportion ranging from 45 to 55X in partial pressure of the gas mixture.
  • this proportion is close to 50X.
  • the first gas being krypton and the second gas being oxygen
  • a gaseous mixture containing 94.5 to 95.5% in partial pressure is used. oxygen.
  • the subject of the invention is also a source of ions operating in impulse mode allowing the implementation of the process for producing multi-charged ions characterized in that it comprises an enclosure connected to two gas inlets, an inlet for a first gas, and another input for a second gas, provided with a valve controlled by the measurement of the pressure in the enclosure by means of a control loop comprising a pressure indicator and a signal amplifier.
  • the source of multicharged ions is characterized in that it is a source of ions with cyclotron resonance of the electrons and in that the ionization takes place in a microwave cavity.
  • a gaseous mixture containing 45 to 55X in partial pressure of helium and preferably 50% of helium is advantageously used.
  • a gaseous mixture containing 45 to 55% in partial pressure of oxygen or nitrogen and preferably 50% of oxygen or nitrogen is advantageously used.
  • the intensity of the electric ion currents is presented in the form of a table below.
  • the elements carbon, nitrogen, oxygen, neon and argon, extracted from an ion source in which a mixture of gases was injected. in a proportion of 50-50 at partial pressure.
  • a gas mixture containing 94.5% is advantageously used at 95.5% oxygen at partial pressure.
  • a gas mixture containing 5X of krypton and 95X of oxygen makes it possible, for example, to obtain a current of 20 ⁇ A of Kr 13+ or a current of 1 ⁇ A of Kr 18+ .
  • a current of 1 ⁇ A of N +7 is for example necessary for biomedical applications such as the treatment of cancers and a current of 3 ⁇ A of Ar +12 allows, after additional ionization, the same biomedical applications.
  • the 100 ⁇ A current level of 0 +6 is in great demand for certain nuclear physics accelerators.
  • the enclosure is connected to two gas inlets 3 and 4, one for the first gas of the mixture or gas to be ionized, another provided with a valve 5 controlled by the measurement of the pressure in the enclosure 1 by means of a control loop comprising an indicator 6 of the pressure in the enclosure and a signal amplifier 7.
  • the slave valve 5 ensures the proportion of the components of the gas mixture introduced into the enclosure.
  • a microwave cavity of an ion source with cyclotron resonance of the electrons has been shown, but the ion source may also be of another type.
  • the manner in which the plasma is created in the cavity has nothing to do with the effect of increasing the performance under charge and current of an ion source, which is accomplished by introducing a mixture of gas.
  • the shape of the enclosure can be any as long as it is adapted to the operation of the source, the gas inlets can be located for example at the ends or on the wall of the cavity.
  • the second gas is helium at 50% at partial pressure
  • a cryogenic pump at approximately 20 ° K is necessary to obtain the indicated performances. At this temperature the helium pumping speed is strictly zero.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Electron Sources, Ion Sources (AREA)
  • Particle Accelerators (AREA)
EP19840401359 1983-06-30 1984-06-26 Verfahren zur Erzeugung mehrfach geladener Ionen Expired EP0130907B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8310862A FR2548436B1 (fr) 1983-06-30 1983-06-30 Procede de production d'ions lourds multicharges et sources d'ions en regime impulsionnel, permettant la mise en oeuvre du procede
FR8310862 1983-06-30

Publications (2)

Publication Number Publication Date
EP0130907A1 true EP0130907A1 (de) 1985-01-09
EP0130907B1 EP0130907B1 (de) 1988-09-07

Family

ID=9290347

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840401359 Expired EP0130907B1 (de) 1983-06-30 1984-06-26 Verfahren zur Erzeugung mehrfach geladener Ionen

Country Status (4)

Country Link
EP (1) EP0130907B1 (de)
JP (1) JPS6037638A (de)
DE (1) DE3473966D1 (de)
FR (1) FR2548436B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0252845B1 (de) * 1986-07-10 1990-04-25 Commissariat A L'energie Atomique Elektronzyklotronresonanz-Ionenquelle
FR2679066A1 (fr) * 1991-07-08 1993-01-15 Commissariat Energie Atomique Procede de production d'ions multicharges.
DE19933762A1 (de) * 1999-07-19 2001-02-01 Andrae Juergen Gepulste magnetische Öffnung von Elektronen-Zyklotron-Resonanz-Jonenquellen zur Erzeugung kurzer, stromstarker Pulse hoch geladener Ionen oder von Elektronen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3476968A (en) * 1966-12-19 1969-11-04 Hitachi Ltd Microwave ion source
GB2069230A (en) * 1980-02-13 1981-08-19 Commissariat Energie Atomique Process and apparatus for producing highly charged large ions and an application utilizing this process

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3476968A (en) * 1966-12-19 1969-11-04 Hitachi Ltd Microwave ion source
GB2069230A (en) * 1980-02-13 1981-08-19 Commissariat Energie Atomique Process and apparatus for producing highly charged large ions and an application utilizing this process

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON NUCLEAR SCIENCE, vol. NS-23, no. 2, avril 1976, pages 1035-1041, New York, US; B.N. MAKOV: "The multiply charged ion source with indirectly heated cathode" *
REVUE DE PHYSIQUE APPLIQUEE, vol. 15, no. 5, mai 1980, pages 995-1005, Paris, FR; R. GELLER et al.: "Micromafios source d'ions multichargés basée sur la résonance cyclotronique des électrons" *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0252845B1 (de) * 1986-07-10 1990-04-25 Commissariat A L'energie Atomique Elektronzyklotronresonanz-Ionenquelle
FR2679066A1 (fr) * 1991-07-08 1993-01-15 Commissariat Energie Atomique Procede de production d'ions multicharges.
DE19933762A1 (de) * 1999-07-19 2001-02-01 Andrae Juergen Gepulste magnetische Öffnung von Elektronen-Zyklotron-Resonanz-Jonenquellen zur Erzeugung kurzer, stromstarker Pulse hoch geladener Ionen oder von Elektronen
DE19933762C2 (de) * 1999-07-19 2002-10-17 Juergen Andrae Gepulste magnetische Öffnung von Elektronen-Zyklotron-Resonanz-Jonenquellen zur Erzeugung kurzer, stromstarker Pulse hoch geladener Ionen oder von Elektronen

Also Published As

Publication number Publication date
FR2548436A1 (fr) 1985-01-04
FR2548436B1 (fr) 1986-01-10
DE3473966D1 (en) 1988-10-13
EP0130907B1 (de) 1988-09-07
JPS6037638A (ja) 1985-02-27

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