Plasma confinement by localized cusps

Leung, K. N.; Hershkowitz, N.; MacKenzie, K. R.

doi:10.1063/1.861575

Cited by 209 publications

(100 citation statements)

References 7 publications

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“…Moreover, C 1 could be heated up to a few hundred degrees using a vacuum compatible heating system sandwiched between C 1 and an additional cylinder, C 2 , electrically insulated from the wall. The pressure inside the main chamber during the measurements was 3 mTorr and the discharge voltage 150 V. A transversal magnetic filter divides the chamber into two regions: source plasma (SP) and target plasma (TP) [49][50][51]. It was made of permanent magnets (2000 Gauss at the surface) placed in rectangular pipes situated 45 mm apart.…”

Section: Methodsmentioning

confidence: 99%

Properties of highly electronegative plasmas produced in a multipolar magnetic-confined device with a transversal magnetic filter

Draghici¹,

Stamate²

2010

J. Phys. D: Appl. Phys.

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Highly electronegative plasmas were produced in Ar/SF 6 gas mixtures in a DC discharge with multipolar magnetic confinement and transversal magnetic filter.Langmuir probe and mass spectroscopy were used for plasma diagnostics. Plasma potential drift, the influence of small or large area biased electrodes on plasma parameters, the formation of the negative ion sheath, and etching rates by positive and negative ions have been investigated for different experimental conditions.Reducing the electron temperature below 1 eV the density ratio of negative ion to electron exceeded 100 even for very low amounts of SF 6 gas. The plasma potential drift could be controlled by proper wall conditioning. A large-electrode biased positively had no effect on plasma potential for density ratios of negative ion to electrons larger than 50. For similar electronegativities or higher a negative ion sheath could be formed by applying a positive bias of a few hundred volts.

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Section: Methodsmentioning

confidence: 99%

Properties of highly electronegative plasmas produced in a multipolar magnetic-confined device with a transversal magnetic filter

Draghici¹,

Stamate²

2010

J. Phys. D: Appl. Phys.

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“…The magnetic fields of these structures were expressed as rapidly converging Fourier series [17,18], series with Bessel functions [19] and in closed form [20,21]. Twodimensional confinement systems for ion sources were calculated in [22].…”

Section: Introductionmentioning

confidence: 99%

Closed Analytical Formulae for Multi-Pole Magnetic Rings

Ausserlechner¹

2012

PIER B

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Abstract-Multi-pole permanent magnetic encoders are used for wheel speed sensing in automotive systems. This paper discusses rings and discs magnetized along axial direction. The vector field is calculated analytically in 3D as sums over all poles. For the case of discs with vanishing inner and infinite outer diameter the summation is done in closed form with a new summation formula. The results are discussed and several plots of field patterns are given in normalized form: At very small air-gap the field shows an overshoot. At moderate and large air-gaps it is a sine-function with exponentially decaying amplitude. The amplitude versus air gap, reading radius, thickness of the magnetic layer, and number of poles is studied and excellent agreement with measurements is found. The effect of a steel-back on the field is explained. It is also shown how to maximize the torque transmitted in axially magnetized couplings.

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“…The primary electron leak area is given by 13,14 A p ϭ2r p N m L m while the plasma electron leak area is A e ϭ 4N m L m ͱr e r i ; r k is the Larmor radius given by…”

Section: Rϭmentioning

confidence: 99%

“…The magnetic cusp ion leak area can be estimated by A im ϭ4A e . 13,14 From energy conservation and the flux continuity condition, the ion density in the sheath is determined as…”

Section: Rϭmentioning

confidence: 99%

Conceptual design of a beam extraction electrode system for a 1 mN ion thruster

Sandonato

Barroso

1996

Review of Scientific Instruments

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Conceptual modeling of the multiaperture electrode system of a 5-cm-diam ring cusp ion thruster intended for producing a 1 mN thrust is described. A mathematical treatment of the ion extraction from the plasma has been developed to provide a method for calculating both the shape and potential of the plasma-emitting surface. The ion optics of the electrode system have been examined using a numerical code to evaluate the ion beam divergence. Close agreement is achieved between the predictions of the conceptual modeling presented here and published experimental results.

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Plasma confinement by localized cusps

Cited by 209 publications

References 7 publications

Properties of highly electronegative plasmas produced in a multipolar magnetic-confined device with a transversal magnetic filter

Properties of highly electronegative plasmas produced in a multipolar magnetic-confined device with a transversal magnetic filter

Closed Analytical Formulae for Multi-Pole Magnetic Rings

Conceptual design of a beam extraction electrode system for a 1 mN ion thruster

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