High-Current Ion Source

Meyerand, R.G.; Brown, Sanborn C.

doi:10.1063/1.1716475

Cited by 21 publications

(3 citation statements)

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“…Figure 9 shows the configuration of an ion source for plasma propulsion, based on the Galathea trap developed by Morozov and co-workers [26,27] and previously modelled in [28]. This source configuration shows some similarity to the Penning discharge configuration developed in the 1930s [29] and used in ion sources in the 1950s [30]. The plasma is created in an annular source chamber containing a complex magnetic field and then flows into an acceleration channel similar to a standard HET channel; we focus on the source chamber.…”

Section: Example Iii: Semi-galathea Sourcementioning

confidence: 99%

Modelling electron transport in magnetized low-temperature discharge plasmas

Hagelaar¹

2007

Plasma Sources Sci. Technol.

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Magnetic fields are sometimes used to confine the plasma in low-pressure low-temperature gas discharges, for example in magnetron discharges, Hall-effect-thruster discharges, electron-cyclotron-resonance discharges and helicon discharges. We discuss how these magnetized discharges can be modelled by two-dimensional self-consistent models based on electron fluid equations. The magnetized electron flux is described by an anisotropic drift-diffusion equation, where the electron mobility is much smaller perpendicular to the magnetic field than parallel to it. The electric potential is calculated either from Poisson's equation or from the electron equations, assuming quasineutrality. Although these models involve many assumptions, they are appropriate to study the main effects of the magnetic field on the charged particle transport and space charge electric fields in realistic two-dimensional discharge configurations. We demonstrate by new results that these models reproduce known phenomena such as the establishment of the Boltzmann relation along magnetic field lines, the penetration of perpendicular applied electric fields into the plasma bulk and the decrease in magnetic confinement by short-circuit wall currents. We also present an original method to prevent numerical errors arising from the extreme anisotropy of the electron mobility, which tend to invalidate model results from standard numerical methods.

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Section: Example Iii: Semi-galathea Sourcementioning

confidence: 99%

Modelling electron transport in magnetized low-temperature discharge plasmas

Hagelaar¹

2007

Plasma Sources Sci. Technol.

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“…coldcathode or Penning gauge) and was later adapted to also function as an ion source (Penning 1937). PIG ion sources have been used for a variety of applications, such as sputtering and evaporation of surfaces, electromagnetic separation of isotopes and fusion applications (Barnett et al 1953, Meyerand and Brown 1959, Roth 1995, Loeb 2005. Another possible application is in a sealed-tube neutron generator (Nargolwalla and Przybylowicz 1973).…”

Section: Introductionmentioning

confidence: 99%

Design parameter investigation of a cold-cathode Penning ion source for general laboratory applications

Rovey¹

2008

Plasma Sources Sci. Technol.

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An investigation of different design parameters of a cold-cathode Penning ion source is described. The Penning source had an iron cathode body, samarium cobalt permanent magnet, stainless steel anode and iron cathode faceplate. The faceplate extraction orifice diameter, anode shape and permanent magnet location were adjusted. Discharge current-voltage characteristics and current to a grounded target were measured for the different ion source configurations. Results indicate that for hydrogen and helium operation, the largest orifice, cylinder anode and baseline magnet location provides optimum source operation. Specifically, a continuous positive hydrogen ion target current of 1.0 ± 0.15 mA was attainable at only 1.6 × 10 −4 Torr of pressure. At 1.0 mTorr of hydrogen pressure a target current of 2.0 ± 0.15 mA was possible. These results far surpass the design goal of 1 mA hydrogen ion beam at 1 mTorr of pressure. This cold-cathode Penning ion source design has potential application in a wide variety of laboratory research and development projects.

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“…For the strongfied approach of equation (9) is within about 10 percent of the corresponding Maxwelliandistribution approach. Thus equation (9) for aL is sufficiently accurate to use in the plasma potential difference expression, equation (5). The variables of equation (9), though, a r e not suitable for a generalizing parameter based on overall measurements and readily available properties.…”

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confidence: 99%

125. Performance correlation for electron-bombardment ion sources

1966

Vacuum

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SUMMARYA procedure is presented for estimating the gross performance characteristics of a low-density electron-bombardment ion source. Although this ion source was initially investigated for use as a component of an electric-propulsion system, it should also be useful in a variety of other applications. The overall ion source performance was evaluated on the basis of two parameters; the minimum discharge energy (per ion), and the propellant utilization at a discharge energy twice this minimum value. The approach used was to derive generalizing parameters for both of these measures of performance by analysis of the more important ion-source processes. These generalizing parameters involve only overall ion-source measurements and readily available propellant properties. Within certain limits, the use of these generalizing parameters correlates the experimental data within about k50 percent for minimum discharge energy and within about *20 percent for the nominal propellant utilization (where the discharge energy is twice the minimum value). Two of these limits are that the discharge potential difference should not be less than about 2.0 times the first ionization potential of the propellant, and that the cyclotron radius of the primary electrons emitted from the cathode should not be more than about 0.45 times the ionization-chamber radius. This correlation, however, is not a substitute for good design. Careful handling of design details is still necessary if the best possible performance is to be obtained.

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High-Current Ion Source

Abstract: Highcurrent ion implanter using a microwave ion source Rev. Sci. Instrum. 54, 681 (1983); 10.1063/1.1137453 Microwave ion source for highcurrent implanter Rev. Sci. Instrum. 49, 940 (1978);

Cited by 21 publications

References 2 publications

Modelling electron transport in magnetized low-temperature discharge plasmas

Modelling electron transport in magnetized low-temperature discharge plasmas

Design parameter investigation of a cold-cathode Penning ion source for general laboratory applications

125. Performance correlation for electron-bombardment ion sources

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