Hollow cathode plasma source design
Design Process of the Hollow Cathode Manufactured for Use in Electric Propulsion Systems as Electron Source .Spatial structures of the electron density and temperature in ring-shaped hollow cathode capacitive rf plasma with a single narrow trench of 2 mm width have been investigated at various trench . In section I, we summarize the important hypotheses of the model.The plasma cathode emission current is controlled by variation of the plasma concentration, the emission electrode potential and the crossed magnetic field.Abstract: This paper presents a preliminary design tool for orificed hollow cathodes. We have used a small hollow-cathode source driven by a simple homemade power supply system. Historically, for deposition purposes, .
High-Current Hollow Cathode Development
Auteur : Wei Jin, Chuanhui Liang, Haiyan Xu, Fujun Gou, Xiaochun Ma, Dongping Wang, Chang’an Chen, A.
A hollow cathode is a type of electron source widely used in the electric propulsion, but it has low efficiency as a standalone thruster, which can-not meet the .Balises :Hollow Cathode Plasma SourceF.
An outline drawing of the plasma source is shown in Fig.Simulation of hollow-cathode-nitriding plasma and design of diffusion equipment with DC and RF dual discharge. Physics, Engineering. A two-dimensional axisymmetric quasi-neutral fluid model of an emissive hollow cathode that includes neutral xenon, single charge ions and electrons has been developed.A self-sustaining hollow cathode plasma source has been demonstrated to operate at an order of magnitude lower deposition pressure than previously reported, enabling plasma ion-assisted electron beam deposition at pressures of ≈ 2. Surface and Coatings Technology.Balises :Hollow Cathode PlasmaHana Barankova, Ladislav BardosPublish Year:2001Balises :Hollow Cathode Plasma SourcePublish Year:1998In this work we present novel hollow cathode based plasma sources for large area processing at both reduced and atmospheric pressures. Section snippets.
NSTAR BaO orificed hollow cathode design as a reference design[2].We developed a steady-state high-density plasma source by applying a hollow cathode to a cascade arc discharge device.Balises :Hollow Cathode PlasmaHollow CathodesPropulsion+2Hollow Cathode ApplicationsHollow Cathode Lamp Working Principle
Hollow cathode and hybrid atmospheric plasma sources*
uncertain current demand.This includes descriptions of hollow cathode designs capable of < 1 A to over 300 A, advances in electron emitter and heating/starting technologies, and modeling and . The graphite cathode decreased the contaminate of metal impurity obtained by sputtering metal screen during the carburizing, and as a carbon source besides the gas precursor . The dependences of the spectral line intensities Xe I-4807. In this work, the size of the cathode is 180 mm in inner diameter and 200 mm in height, and the carburized sample placed in the center of cathodic cage has a high .Balises :PropulsionHollow Cathode Thruster Search for other works by this author on: This Site.Effective design of multiple hollow cathode electrode to enhance the density of rf capacitively coupled plasma H.02 Å, Xe II-4844.Balises :Hollow Cathode PlasmaHollow Cathodes
Yet, the model developed remains applicable to any cathode design or emissive element. ZimmermannPublish Year:2010This development resulted in a design of a hollow cathode with an inner diameter of 4 mm surrounded by an annular anode with an integrated solenoid coil that . This method uses a restrictor plate to create a pressure differential in gas flow between a .
Abstract Device design
A two-dimensional axisymmetric quasi-neutral fluid model of an emissive hollow cathode that includes neutral xenon, single charge ions and electrons . Fused Hollow Cathode, Hybrid
Low-pressure hollow cathode plasma source as a novel low temperature carburizing technique achieved the high uniformity and efficiency of modification.
Plasma in a closed volume of the hollow cathode is produced by thermoemission electrons and ionized atoms dosed to the source or diffused from the . The power consumption is very low, of the order of .Hollow-cathode plasma discharges have been described by a number of authors. Physica Scripta 98 (2) DOI: . Google Scholar.Balises :Hollow Cathode PlasmaPublish Year:2017 In section 2, we summarize the important hypotheses of the model.Balises :Hollow Cathode PlasmaHollow CathodesHollow Cathode ApplicationsHollow cathode is responsible for both creating plasma discharge and neutralization of the beam ions for Hall Effect Thruster (HET). Whereas the laboratory model still contains a heater spiral for pre-heating of the cathode tube, this part could be omitted in the serial model, because a newly developed power supply with high-voltage-pulse ignition and arc . The model is intended to . We then detail in section 3 the equations gov-erning the plasma and thermal aspects of the cathode as well as the associated . Lee a) Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea.33 Å and La II-3949. The distribution of working gas spectral lines and cathode material in the optical radiation of arc discharge plasma with a hollow cathode is investigated. Plasma Sources Science and Technology.Abstract We describe the design and main parameters of a fore-vacuum pressure, plasma-cathode electron source with an extended range of operating . HOLLOW CATHODE.The plasma source provides high ion flux density for H2/He/N2/Ar, with simple structure, high gas and energy efficiency. Two physical models compose the tool: a plasma model and a thermal model. The resulting FHC discharge is very stable, homogeneous, luminous, volume filling, without streamers. • The discharge breakdown voltage with magnet is lower than that without magnet under low gas pressure of 1 ≤ p H2 ≤ 30 Pa.This development resulted in a design of a hollow cathode with an inner diameter of 4 mm surrounded by an annular anode with an integrated solenoid coil that produces an axial magnetic field.AGC has demonstrated the scalability of this PECVD process to include these challenging applications.1 Å on the parameters of the external arc column plasma, cathode wall .Atmospheric-pressure plasma sources based on the hollow cathodes exhibit a high activation de-gree of species.Hollow cathodes are a critical component of most in-space electric propulsion devices. Principles and findings from performance of hollow cathodes at reduced pressures have been applied in atmospheric pressure hollow cathode based sources .Balises :PropulsionHollow Cathode ThrusterCathode Design of Ion Thruster+2Different Thruster DesignsNorman Gondol, Martin TajmarA hollow cathode plasma source is well suited for this application, and was therefore selected as the design approach for station plasma contactor system.1088/1402-4896/acb330 Corpus ID: 255899407; Simulation of hollow-cathode-nitriding plasma and design of diffusion equipment with DC and RF dual discharge @article{Zhang2023SimulationOH, title={Simulation of hollow-cathode-nitriding plasma and design of diffusion equipment with DC and RF dual discharge}, .This article presents the principle of operation, design, and performance data of a hollow cathode vacuum arc plasma electron source. Ozturk, Celik UHUK-2014-090 INTRODUCTION Hollow cathodes, which are used in ion and Hall effect thrusters, plasma generators and ion sources as electron sources, have been under investigation for more than 50 years.Taille du fichier : 278KB The lateral uniformity with roughness 0. Hollow cathodes act as both neutralizers and plasma sources for Hall and ion thrusters and affect the operational lifetime, maximum discharge power, and performance of these thrusters.Hollow cathodes operate in a “self-heating” mode, in which the external heater is turned off during operation and the cathode insert is heated by plasma bombardment. The formation and diffusion of plasma are complex and critical processes in plasma nitriding.Balises :Hollow Cathode Plasma SourcePublish Year:2003
Hollow Cathode Plasma Processes and Applications
These barrel-shaped cathodes were devel- oped l argely a s rep .5 = plasma production source term ~ .6 meter hollow cathode plasma devices have made it possible to .
Chapter 6 cathodes 022208
The FHC with its modular concept has been successfully . The plasma cathode electron beam source, with 200 keV energy and microsecond pulse duration, provides electron beams with a cross section up to 104 cm2, beam current from 10 to . CEAS Space Journal.
In order to reduce the emission melting and .The cascade arc discharge device with the hollow cathode produced a stationary plasma with an . Using the method of “grid stabilization” it was possible to generate an e beam . The Series 50 is one of our most popular hollow cathode plasma sources.The shape and size design of graphite cathodic cage as well as the number of hollow cathode graphite tube were depended on the carburized components. The plasma cathode is based on a hollow-cathode direct current (dc) discharge.4 In addition to the .Design of a hollow cathode thruster: concepts, parameter study and initial test results | CEAS Space Journal.2 of high-density(10 11 cm-3) profile with 10 11 cm −3 is .
Hollow cathode plasma sources for large area surface treatment
There are three self-heating mechanisms possible in hollow cathodes: (1) orifice heating, (2) ion heating, and (3) electron heating. Volumes 146–147, . Article and author information. The results demonstrated that the HC-CCP presents wide ranges of electron density ( ne ), between .An efficient plasma source has been established by arranging a hot hollow cathode electron emitter in a strong axial magnetic field, allowing for a reduction of .The experiences gained from application of the thermoemission ion source as well as the results presented in [7], inspired us to use a similar mechanism to that described above of “ion pumping” in plasma sources. 2–5 Here we describe our version of hollow-cathode-based plasma source. The gas discharge is coupled with a thermal model of the cathode into a self . In this study, appropriate placement of the cathode is . The systematic scanning for the .The C12A7 hollow cathode is expected to usher in a new generation of hollow cathodes because of its low work function and chemical stability.With the tool, a novel capacitively coupled plasma driven by the hollow cathode radio-frequency discharges (HC-CCP) was observed experimentally, and its properties in the center of the chamber were investigated by a Langmuir probe. We then detail in section II the equations governing the plasma and thermal aspects of the .Balises :Hollow Cathode Plasma SourceFred Fietzke, Henry Morgner, Steffen Günther
Fore-Vacuum Ribbon Beam Plasma Electron Source Based on a
The hollow cathode is made of a thermionic material (LaB 6) to facilitate plasma production inside it.The fused hollow cathode (FHC) source is based on simultaneous radio frequency (rf) generation of hollow cathode discharges in an integrated, open structure, with flowing gas.Published 31 March 2017.Hollow cathode plasma sources for large area surface treatment - ScienceDirect.
