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Showing 1 to 16 of 16 for “"ion extraction"”.
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Ion Extraction Using Electronic Space Charge Fields--a Theoretical Analysis
Made available in DSpace on 2014-12-12T20:54:51Z (GMT). No. of bitstreams: 1 7821239.pdf: 1982991 bytes, checksum: a7dfc5e053b5eb81f842fd7953f6d4ad (MD5) Previous issue date: 1978
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Analysis of power balance in a helicon plasma source
… Electrostatic Rocket (HIIPER), a space propulsion concept consisting of a helicon source for plasma generation and an ion extraction method using a nested pair of inertial electrostatic confinement (IEC) grids that are asymmetrically designed. In this study, the HIIPER setup was modelled based …
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Numerical modelling of a radio-frequency micro ion thruster
… for an inductively-coupled radio-frequency micro ion thruster. Methods of particle and energy balance are utilized for modeling the chamber plasma discharge. A transformer model is incorporated in the equations of energy balance for investigating the effect of plasma on the primary circuit and for …
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Investigation of a space propulsion concept using inertial electrostatic confinement
… Electrostatic Rocket (HIIPER), a space propulsion concept consisting of a helicon source for plasma generation and an ion extraction method using a nested pair of inertial electrostatic confinement (IEC) grids that are asymmetrically designed. In this study, which used argon as a propellant, a …
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Development of an ion transport system for singly charged ion injection into an electron string ion source (ESIS) charge-breeder
A 1+ ion delivery system was designed and constructed for the purpose of ion injection into the Electron String Ion Source (ESIS) charge-breeder at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia. The transport system was initially developed at iThemba LABS in Cape Town. This …
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Development of a quadrupole ion trap / time-of-flight mass spectrometer for mass resolution and ion photophysics
… mass spectrometer, consisting of a quadrupole ion trap (QIT) and a time-of-flight, is described for ion mass resolution and photophysics. Ions are generated externally by electrospray ionization and trapped in the quadrupole ion trap before extraction to the time-of-flight section for mass …
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Ion Transmission in the first vacuum stage of an Inductively Coupled Plasma Mass Spectrometer
… when instrument response varies as the composition of the sample matrix is changed. Matrix effects, or non-spectroscopic interferences, limit the accuracy of routine analysis. Identification of the sources of matrix effects provide a basis for reducing or eliminating them. As inaccuracies in the …
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Hazardous waste treatment and disposal: alternative technologies and groundwater impacts
… to their stage of development or application to hazardous waste; major ones include rotary kiln, liquid injection, and cement kiln incineration; neutralization, chemical oxidation-reduction, and ion exchange; filtration, distillation and settling techniques; and activated sludge, aerated …
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Experimental and numerical validation of ion extractor grids
… is mostly dominated by electrons, as opposed to ions. Since electrons carry a very small momentum due to their light mass, an asymmetrical IEC producing an electron-dominated beam is not a viable propulsion device. In order to provide a greater thrust when the IEC is operating in the Jet-Mode, …
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Studies of the complexation behaviour of transition metals applicable in membrane technologies
Many industrial processes make use of metal ions. These metal ions, however, end up in several effluent streams. Due to very strict discharge values, new technologies are constantly emerging for treating and purifying all kinds of wastewater. One of these innovative technologies is the Supported …
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Solid-State Flow Control for Ion Electrospray Propulsion
Electrospray propulsion offers high-efficiency, low-mass propulsive capabilities, based on ion extraction from ionic liquid propellants, to small spacecraft that exceed the capabilities of conventional chemical propulsion. Two shortcomings of such propulsion systems is their lack of lightweight …
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Nearly Monoenergetic Positive Ion Beam with Self-Neutralized Space Charge Extracted from a Pulsed Plasma and Its Application
Space charge neutralization of an ion beam extracted from a plasma is crucial for advanced plasma processes which require precise control of the ion flux and the width of the ion energy distribution (IED). In previous studies, filaments thermionically emitting electrons were used for neutralizing …
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Comparative simulations of conceptual ion extractors for use in asymmetric inertial electrostatic confinement
Many deep space propulsion missions currently use ballistic trajectories to reach their destinations. To reduce the times of flight, electric or plasma based propulsion systems are used. While Hall Effect thrusters are the general standard for plasma propulsion, new technologies can enable shorter …
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Comparison of high power impulse magnetron sputtering and modulated pulsed power sputtering for interconnect metallization
Ionized physical vapor deposition is used to deposit the barrier and seed layers in the state of the art interlevel metallization process. As the critical dimension keeps shrinking, it has become increasingly difficult to use the current techniques to form thin, continuous and stable barrier/seed …
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Selective Ion Separations Using Shock Electrodialysis
Agricultural development, extensive industrialization, and rapid growth of the global population have inadvertently been accompanied by environmental pollution. At the same time, the chemicals and energy industries face a number of difficult challenges in the selective extraction of high-value …
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Metallo-supramolecular Architectures based on Multifunctional N-Donor Ligands
… architectures based on metal-ligand interactions. The structures formed strongly depend on the used metal ion, the ligand type, the chosen counter ion and solvent as well as on the experimental conditions. The focus of the studies was the design of multifunctional N-donor ligands and the …