Atom ionization process in the thermoionization ion source

Latuszynski, A.; Pyszniak, K.; Droździel, A.; Turek, M.; ̧czka, D. Ma; Meldizon, Jerzy

doi:10.1016/j.vacuum.2007.01.006

Cited by 14 publications

(23 citation statements)

References 5 publications

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“…It was shown that the formula obtained for a spherical cavity [11] describes well simulation results obtained for a tubular ionizer [12]. However, only a few attempts have been made to describe processes (as vapor transport from an irradiated target to the ionizer [13] or release curves dependence on the ionizer's geometry [14]) in the hot cavity surface ionization sources by means of computer simulations.…”

Section: Introductionmentioning

confidence: 80%

Modeling of Ionization in a Spherical Surface Ionizer

Turek

2011

Acta Phys. Pol. A

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A Monte Carlo method-based model of a hot cavity surface ion source with a spherically shaped ionizer is presented. A numerical code enables studies of ion source efficiency as a function of an extraction voltage, geometry of the ionizer and its temperature, the size of extraction aperture and many other factors. The calculation results for a variety of mentioned parameters are presented. A novel configuration of surface ion source is proposed and discussed -the efficiency of the source with an almost spherically shaped ionizer could be much higher than that of currently used constructions of ion sources.

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Section: Introductionmentioning

confidence: 80%

Modeling of Ionization in a Spherical Surface Ionizer

Turek

2011

Acta Phys. Pol. A

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“…In our previous paper 22 a novel and simple analytical model of surface ionization source operation was described. The model was based on the assumption that an atom touching hot ionizer surface could be ionized with the probability determined by the Saha-Langmuir formula 23 (more details can be found in Sec.…”

Section: Introductionmentioning

confidence: 99%

“…For such operational mode the source ionization efficiency was calculated in the frame of discrete model ("each ion" formula in Ref. 22)-it may be much greater than that calculated from the Saha-Langmuir formula. In practice such operational regime is very difficult to maintain mostly due to the necessity of very high extraction voltage usage, e.g., for a typical ionizer one can estimate the necessary field strength as several tens or hundreds of volts per centimeter.…”

Section: Introductionmentioning

confidence: 99%

Simulations of ionization in a hot cavity surface ion source

Turek

Droździel

Pyszniak

et al. 2012

Review of Scientific Instruments

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A new numerical Monte Carlo method based model of a hot cavity surface ionization ion source is presented in this paper. The model, intended to support the studies on ionization phenomena in a widely used class of ion sources, takes into account geometry of the ion source and extraction system, ionizer temperature and other features. The results of ion source efficiency calculations for various configurations of the extraction field are reviewed. The dominant role of the ionizer region near the extraction opening is described. Simulated dependences of ionization efficiency on the working parameters like ionizer length and temperature, ionization potential of the substance, and extraction voltage are discussed. A good agreement of the experimental data (e.g., influence of ionizer temperature, current-voltage curve) and the predictions of the model is found. It is also shown that the contribution to the ionization yield from impact of thermionic electrons accelerated by the extraction field may be significant, especially for the substances of small surface ionization coefficient. The simulation results are compared to the predictions of different theoretical models of the ion source--the obtained simulation data are in accordance both with a well-known Kirchner formula and the so called spherical ionizer model.

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“…It is based on the assumption that the ionization process could be split [21] into n s stages, when n s is the ratio of the inner surface of the cavity and the surface of the extraction opening. For the sake of simplicity, a spherical cavity of the radius R ion = 8 mm was considered.…”

Section: Numerical Model Of Doubly Charged Ion Productionmentioning

confidence: 99%

Production of Doubly Charged Ions Using a Hollow Cathode Ion Source with an Evaporator

et al. 2013

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The paper describes the production of doubly charged ions from solids and gases using a hollow cathode ion source with an internal evaporator heated by a spiral cathode lament and arc discharge. 15 cm −3 ) with doubly charged ions. Characteristics of the ion source are presented and discussed in order to choose the optimal working parameters. A brief presentation of numerical model of doubly and singly charged ions in the ion source is given. The calculated results (dependences of ion current on the anode voltage) are in good agreement with the experimental data.

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Atom ionization process in the thermoionization ion source

Cited by 14 publications

References 5 publications

Modeling of Ionization in a Spherical Surface Ionizer

Modeling of Ionization in a Spherical Surface Ionizer

Simulations of ionization in a hot cavity surface ion source

Production of Doubly Charged Ions Using a Hollow Cathode Ion Source with an Evaporator

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