Plasma cell adaptation to enhance particle acceleration

Ragheb, M.S.

doi:10.1063/1.2912953

Cited by 4 publications

(3 citation statements)

References 20 publications

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“…Depending on each experimental conditions the collected data assuming profiles of plasma pressure (6) , plasma electrons density, discharge gradient voltage and gas discharged along the plasma tube, indicate that the effects behaving the plasma current depends not only on the amount of external circuit current and its flow direction, but mainly on the plasma electron density and media particles type landing on the electrodes and resulting from the interaction of electric fields generated in the plasma.…”

Section: Comparison Between Figuresmentioning

confidence: 99%

Influence of electron injection into 27 cm audio plasma cell on the plasma diagnostics

Haleem

Fiki

Nouh

et al. 2013

Review of Scientific Instruments

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In this article, the plasma is created in a Pyrex tube (L = 27 cm, φ = 4 cm) as a single cell, by a capacitive audio frequency (AF) discharge (f = 10-100 kHz), at a definite pressure of ~0.2 Torr. A couple of tube linear and deviating arrangements show plasma characteristic conformity. The applied AF plasma and the injection of electrons into two gas mediums Ar and N2 revealed the increase of electron density at distinct tube regions by one order to attain 10(13)∕cm(3). The electrons temperature and density strengths are in contrast to each other. While their distributions differ along the plasma tube length, they show a decaying sinusoidal shape where their peaks position varies by the gas type. The electrons injection moderates electron temperature and expands their density. The later highest peak holds for the N2 gas, at electrons injection it changes to hold for the Ar. The sinusoidal decaying density behavior generates electric fields depending on the gas used and independent of tube geometry. The effect of the injected electrons performs a responsive impact on electrons density not attributed to the gas discharge. Analytical tools investigate the interaction of the plasma, the discharge current, and the gas used on the electrodes. It points to the emigration of atoms from each one but for greater majority they behave to a preferred direction. Meanwhile, only in the linear regime, small percentage of atoms still moves in reverse direction. Traces of gas atoms revealed on both electrodes due to sheath regions denote lack of their participation in the discharge current. In addition, atoms travel from one electrode to the other by overcoming the sheaths regions occurring transportation of particles agglomeration from one electrode to the other. The electrons injection has contributed to increase the plasma electron density peaks. These electrons populations have raised the generated electrostatic fields assisting the elemental ions emigration to a preferred electrode direction. Regardless of plasma electrodes positions and plasma shape, ions can be departed from one electrode to deposit on the other one. In consequence, as an application the AF plasma type can enhance the metal deposition from one electrode to the other.

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Section: Comparison Between Figuresmentioning

confidence: 99%

Influence of electron injection into 27 cm audio plasma cell on the plasma diagnostics

Haleem

Fiki

Nouh

et al. 2013

Review of Scientific Instruments

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“…Even so, AF discharge studies have revealed interesting results. A few recent examples include the work of Ragheb, [6] in which a 20 kHz low power consumption plasma cell operation was demonstrated. Results on audio frequency ion source operation have been presented by Ragheb and Zakhary.…”

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confidence: 99%

Experimental Investigation of Low Pressure Audio Frequency Discharge in Argon

Azooz¹,

Owaid²

2012

Chinese Phys. Lett.

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Experimental data obtained on audio frequency (100–10000 Hz) discharge in argon at four pressures 50, 60, 70, and 80 mTorr are presented. The data show significant changes of the discharge current waveform with frequency. These changes seem to be associated with the glow discharge profile and colour. An empirical model based on the assumption of a frequency-dependent breakdown voltage is used to describe the experimental data.

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“…Audio-Ultrasonic frequency (AF from 10 to 100 kHz) plasma source, generating adequate plasma in a simple design system and easy in operation characterizes the present plasma. Such system succeeded to reveal different amazing properties [5][6][7] exposing simple parameters spreading over particles extraction.…”

Section: Introductionmentioning

confidence: 99%

Extraction of ions and electrons from audio frequency plasma source

2016

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Herein, the extraction of high ion / electron current from an audio frequency (AF) nitrogen gas discharge (10 – 100 kHz) is studied and investigated. This system is featured by its small size (L= 20 cm and inner diameter = 3.4 cm) and its capacitive discharge electrodes inside the tube and its high discharge pressure ∼ 0.3 Torr, without the need of high vacuum system or magnetic fields. The extraction system of ion/electron current from the plasma is a very simple electrode that allows self-beam focusing by adjusting its position from the source exit. The working discharge conditions were applied at a frequency from 10 to 100 kHz, power from 50 – 500 W and the gap distance between the plasma meniscus surface and the extractor electrode extending from 3 to 13 mm. The extracted ion/ electron current is found mainly dependent on the discharge power, the extraction gap width and the frequency of the audio supply. SIMION 3D program version 7.0 package is used to generate a simulation of ion trajectories as a reference to compare and to optimize the experimental extraction beam from the present audio frequency plasma source using identical operational conditions. The focal point as well the beam diameter at the collector area is deduced. The simulations showed a respectable agreement with the experimental results all together provide the optimizing basis of the extraction electrode construction and its parameters for beam production.

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Plasma cell adaptation to enhance particle acceleration

Cited by 4 publications

References 20 publications

Influence of electron injection into 27 cm audio plasma cell on the plasma diagnostics

Influence of electron injection into 27 cm audio plasma cell on the plasma diagnostics

Experimental Investigation of Low Pressure Audio Frequency Discharge in Argon

Extraction of ions and electrons from audio frequency plasma source

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