A method for radial extraction of ions from a PIG source using an asymmetrical Wien filter

S. Biri, S. L. Bogomolov, I. Koos

Research output: Contribution to journalArticle

Abstract

The ion optical system (IOS) of an injector based on an arc multiply charged ion source working in the magnetic field has been computed. The system consists of a PIG-type source with a radial exit slit, an accel-decel electrode system and an electrostatic compensator (Wien filter) to compensate the deflecting action of the magnetic field. It is shown that the hyperbolic potential distribution between the filter plates provides the ion beam with minimal deflection from the axis of the IOS at the exit of the IOS. The filter plates must have different absolute values of potentials and also a strong geometrical asymmetry to the IOS axis. A computer simulation of ion trajectories in the IOS, constructed by the proposed method, has been carried out. It is shown that an IOS of this type provides extraction of ions in a wide band of the A/Z ratio (A is the atomic mass, Z is the ion charge) and a magnetic field value on the axis of the system. The beam, strongly deflected from the axis in the accel-decel section of the IOS, has the next typical average displacement and angle (with the axis) at the end of the IOS: ±1 mm and ±1°, respectively.

Original languageEnglish
Pages (from-to)56-60
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume306
Issue number1-2
DOIs
Publication statusPublished - Aug 15 1991

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Optical systems
filters
Ions
ions
Magnetic fields
magnetic fields
ion charge
atomic weights
compensators
injectors
Ion sources
ion sources
slits
deflection
Ion beams
Electrostatics
arcs
computerized simulation
ion beams
asymmetry

ASJC Scopus subject areas

  • Instrumentation
  • Nuclear and High Energy Physics

Cite this

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abstract = "The ion optical system (IOS) of an injector based on an arc multiply charged ion source working in the magnetic field has been computed. The system consists of a PIG-type source with a radial exit slit, an accel-decel electrode system and an electrostatic compensator (Wien filter) to compensate the deflecting action of the magnetic field. It is shown that the hyperbolic potential distribution between the filter plates provides the ion beam with minimal deflection from the axis of the IOS at the exit of the IOS. The filter plates must have different absolute values of potentials and also a strong geometrical asymmetry to the IOS axis. A computer simulation of ion trajectories in the IOS, constructed by the proposed method, has been carried out. It is shown that an IOS of this type provides extraction of ions in a wide band of the A/Z ratio (A is the atomic mass, Z is the ion charge) and a magnetic field value on the axis of the system. The beam, strongly deflected from the axis in the accel-decel section of the IOS, has the next typical average displacement and angle (with the axis) at the end of the IOS: ±1 mm and ±1°, respectively.",
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T1 - A method for radial extraction of ions from a PIG source using an asymmetrical Wien filter

AU - Biri, S.

AU - Bogomolov, S. L.

AU - Koos, I.

PY - 1991/8/15

Y1 - 1991/8/15

N2 - The ion optical system (IOS) of an injector based on an arc multiply charged ion source working in the magnetic field has been computed. The system consists of a PIG-type source with a radial exit slit, an accel-decel electrode system and an electrostatic compensator (Wien filter) to compensate the deflecting action of the magnetic field. It is shown that the hyperbolic potential distribution between the filter plates provides the ion beam with minimal deflection from the axis of the IOS at the exit of the IOS. The filter plates must have different absolute values of potentials and also a strong geometrical asymmetry to the IOS axis. A computer simulation of ion trajectories in the IOS, constructed by the proposed method, has been carried out. It is shown that an IOS of this type provides extraction of ions in a wide band of the A/Z ratio (A is the atomic mass, Z is the ion charge) and a magnetic field value on the axis of the system. The beam, strongly deflected from the axis in the accel-decel section of the IOS, has the next typical average displacement and angle (with the axis) at the end of the IOS: ±1 mm and ±1°, respectively.

AB - The ion optical system (IOS) of an injector based on an arc multiply charged ion source working in the magnetic field has been computed. The system consists of a PIG-type source with a radial exit slit, an accel-decel electrode system and an electrostatic compensator (Wien filter) to compensate the deflecting action of the magnetic field. It is shown that the hyperbolic potential distribution between the filter plates provides the ion beam with minimal deflection from the axis of the IOS at the exit of the IOS. The filter plates must have different absolute values of potentials and also a strong geometrical asymmetry to the IOS axis. A computer simulation of ion trajectories in the IOS, constructed by the proposed method, has been carried out. It is shown that an IOS of this type provides extraction of ions in a wide band of the A/Z ratio (A is the atomic mass, Z is the ion charge) and a magnetic field value on the axis of the system. The beam, strongly deflected from the axis in the accel-decel section of the IOS, has the next typical average displacement and angle (with the axis) at the end of the IOS: ±1 mm and ±1°, respectively.

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