# IEEE Transactions on Plasma Science

### Early Access Articles

Early Access articles are made available in advance of the final electronic or print versions. Early Access articles are peer reviewed but may not be fully edited. They are fully citable from the moment they appear in IEEE Xplore.

## Filter Results

Displaying Results 1 - 25 of 129
• ### Numerical Simulations of Air Breakdown by Microwave With Two Orthogonal Electric Fields

Publication Year: 2018, Page(s):1 - 5
| |PDF (789 KB)

In the near-field zone of an antenna or a microwave device, high-power microwave that may contain two orthogonal electric field components frequently causes air breakdown. The electric field power of microwave for heating electrons is deduced from the equation of electron momentum, and is introduced into a model coupling the equations of electron number density and electron energy to investigate a... View full abstract»

• ### Numerical Modeling of Electrical Discharges in Long Air Gaps Tested With Positive Switching Impulses

Publication Year: 2018, Page(s):1 - 11
| |PDF (1894 KB)

The numerical modeling of electrical discharges occurring in atmospheric air has been in continuous development during the past decades in different fields, such as high-voltage techniques and lightning protection. Different methodologies have been proposed to represent the physical phenomena taking place at a single full discharge event, departing both from experimental and theoretical approaches... View full abstract»

• ### Melting Point of the Small Crystallization Structure

Publication Year: 2018, Page(s):1 - 6
| |PDF (923 KB)

We consider the melting process of a plasma crystal in a smoky plasma under conditions of the quasi-regular packing approximation of identical spherical charged condensed particles (grains). We theoretically investigate the influence of the grain size on the melting point of small crystal-like structures, formed by agglomerates of metal oxide particles or spatial-ordered particle structures. The d... View full abstract»

• ### Coaxial-Conical Transition in Magnetically Insulated Transmission Line

Publication Year: 2018, Page(s):1 - 8
| |PDF (3238 KB)

Coaxial magnetically insulated transmission line (MITL) was widely used in high-current pulsed power facilities. It is also an important option in future high-current accelerators based on the linear transformer driver (LTD) technology, in which the output line is usually coaxial to fit the component layout. In one of the schemes for high-current LTD accelerator, tens of coaxial MITLs are connecte... View full abstract»

• ### Study on the Welding Process of the Vacuum Vessel Mock-Up for CFETR

Publication Year: 2018, Page(s):1 - 4
| |PDF (1419 KB)

China Fusion Engineering Testing Reactor (CFETR) is a superconducting magnet tokamak. The research and development of the key technologies to the vacuum vessel (VV) manufacture have been carried out a few years ago by the Institute of Plasma Physics, Chinese Academy of Science, Hefei, China, including narrow-gap welding, cutting, and nondestructive testing. The manufacture of the poloidal segment ... View full abstract»

• ### Design and Simulation of a T-Vane Relativistic Inverted Magnetron

Publication Year: 2018, Page(s):1 - 6
| |PDF (4154 KB)

A design for a high-power relativistic inverted magnetron oscillator (IMO) is presented and modeled numerically using the massively parallel electromagnetic particle-in-cell code, improved concurrent electromagnetic particle in cell (ICEPIC). The inverted magnetron presented here is designed to operate in the L-band for magnetic fields ranging from 0.07 to 0.1 T with voltages ranging from ~250 to ... View full abstract»

• ### A Compact, 10-kV, 2-ns Risetime Pulsed-Power Circuit Based on Off-the-Shelf Components

Publication Year: 2018, Page(s):1 - 4
| |PDF (958 KB)

The use of drift-step-recovery diodes (DSRDs) for producing high-voltage pulses in the nanosecond range requires a prime switch. The prime switch pumps the DSRD with carriers in the forward direction and then pulses the DSRD quickly in the reverse direction. Fast pulsing is necessary in order to achieve a high-compression ratio between the load peak voltage and the supply voltage. Thus, typically,... View full abstract»

• ### Thermal-Hydraulic Analysis for One Water-Cooled Blanket Module of CFETR Based on RELAP5

Publication Year: 2018, Page(s):1 - 9
| |PDF (3323 KB)

The water-cooled ceramic breeder blanket (WCCB) is one of the blanket candidates for the Chinese fusion engineering test reactor (CFETR). The conceptual of WCCB for CFETR under 200-MW fusion power has been designed based on pressurized water-cooled reactor technology. RELAP5 code, which is mature and often used in transient thermal-hydraulic analysis in pressurized water reactor, was selected as t... View full abstract»

• ### Comparison Study of Spatiotemporally Resolved Emissions of Nanosecond Pulsed Microplasma Jets

Publication Year: 2018, Page(s):1 - 7
| |PDF (1258 KB)

A single needle-electrode helium microplasma jet powered by 5- or 164-ns 8-kV pulses at 500 Hz is investigated to elucidate the impact of nanosecond pulse rising rate and pulse duration on emission behaviors of plasmas. For the 5-ns pulsed plasma, the energy per pulse was measured to be 83 μJ, and it is 1.3 times of the 164-ns pulsed plasma. Time-integrated, spatially resolved emissions rev... View full abstract»

• ### Envelope-PIC Hybrid Method for the Simulation of Microwave Reflectometry

Publication Year: 2018, Page(s):1 - 6
| |PDF (1045 KB)

We developed a new hybrid method for the simulation of microwave reflectometry, which are commonly used to measure the plasma density and the density fluctuation in magnetically confined plasmas. For the simulation study of reflectometry, they usually solve a full wave equation assuming linear and steady-state response of the plasma. However, the dynamic properties of the plasma can be important n... View full abstract»

• ### PIC Simulation Study of the Formation Mechanism of Periodic Virtual Cathodes in the Reltron

Publication Year: 2018, Page(s):1 - 6
| |PDF (1836 KB)

This paper presents the basic concept of the formation mechanism of virtual cathodes in the reltron oscillator. For this purpose, a typical experimental device is particle-in-cell (PIC) simulated to validate the simulation model using a commercial PIC code CST Particle Studio.' The formation of virtual cathodes and its repetition at the various positions inside the reltron structure during the R... View full abstract»

• ### The Development of Power Supply for Negative Ion Source Extraction Grid

Publication Year: 2018, Page(s):1 - 5
| |PDF (1153 KB)

The extraction grid power supply (EGPS) is important for neutral beam injection of tokamak, which is used to extract the negative ions from the plasma source. A set of power supply with pulse step modulation topology at 16 kV/20 A has been designed for the negative ions extraction at the Institute of Plasma Physics, Chinese Academy of Sciences, which meets the requirements of fast dynamics, low ri... View full abstract»

• ### Optimal Design of a Coaxial Cavity Based on Quality-Factor Maximization for High-Power Coaxial Magnetron in X-Band

Publication Year: 2018, Page(s):1 - 8
| |PDF (2408 KB)

This paper presents the synthesis of a coaxial cavity for high-power X-band coaxial magnetron. In the proposed design, cavity parameters corresponding to optimum quality factor are determined. The quality factor of the coaxial cavity for the TE₀₁₁ mode is obtained analytically and verified by CST and HFSS simulations. The maximum value of the quality factor achieved is 17,150 ... View full abstract»

• ### Study of a Plasma Boundary Reconstruction Method Based on Reflectometric Measurements for Control Purposes

Publication Year: 2018, Page(s):1 - 6
| |PDF (2064 KB)

A purely geometric approach has been investigated to reconstruct the Demonstration Fusion Power Reactor (DEMO) plasma boundary for control purposes. The whole plasma boundary is reconstructed by using a deformable template method based on B-splines. The final curve shape is achieved by minimizing the distance between a limited number of estimated and measured (at present provided by an equilibrium... View full abstract»

• ### Polarizer Designed for the Electron Cyclotron Resonance Heating System on J-TEXT

Publication Year: 2018, Page(s):1 - 5
| |PDF (1728 KB)

An electron cyclotron (EC) resonance heating (ECRH) system with four 60-GHz/200-kW/0.5-s gyrotrons donated by the Culham Science Center is being developed on J-TEXT for plasma heating and magnetohydrodynamics studies. A controlled polarization launcher has been designed to inject the EC beam into plasma with the desired polarization and direction. The polarizer with sinusoidal grooves has been int... View full abstract»

• ### Characteristics of Alternating Current Corona Discharge Pulses and Its Radio Interference Level in a Coaxial Wire-Cylinder Gap

Publication Year: 2018, Page(s):1 - 8
| |PDF (1518 KB)

Alternating current (ac) corona discharge characteristics are studied by using a small corona cage with different applied ac voltages, where the corona cage is located in a 5-m anechoic chamber to avoid the external electromagnetic interference. Characteristic parameters of ac corona pulses are analyzed statistically, such as peak values of primary and secondary pulses in positive half cycle, the ... View full abstract»

• ### Nuclear and Thermal Analysis of a Reflectometry Diagnostics Concept for DEMO

Publication Year: 2018, Page(s):1 - 7
| |PDF (3360 KB)

The reflectometry diagnostic for demonstration fusion reactor (DEMO) is envisaged to provide the electron density profile and to be used as a control diagnostic for the real-time vertical position controller. An initial conceptual study has been performed defining the position of the antennas and the routing of the waveguides. In the present design, the integration has been driven by the remote ha... View full abstract»

• ### Test Results About Simple CDA + MIK Quench Detection Method on EAST for ITER Superconducting CS Coils

Publication Year: 2018, Page(s):1 - 5
| |PDF (1303 KB)

The test about simple central difference average (CDA) + MIK (Mik mutual inductance between ith and kth component) quench detection method implemented a total of about 100 charging runs on EAST in the past two years, aiming at verifying this new method whether to apply it to ITER CS coils or not. This project is supported by the ITER Organization. To obtain this target, the whole instrumentation h... View full abstract»

• ### Model for Steady-State Fully Kinetic Ion Beam Neutralization Studies

Publication Year: 2018, Page(s):1 - 7
| |PDF (2933 KB)

Fully kinetic plasma simulations, in which ions and electrons are represented by computational particles, are attractive for modeling electron-ion coupling in spacecraft electric propulsion devices. While conceptually simple, fully kinetic simulations are susceptible to a numerical instability due to a finite computational domain. The widely utilized workaround is to artificially expand the domain... View full abstract»

• ### Current Status and Progress on the Shielding Blanket of CFETR

Publication Year: 2018, Page(s):1 - 5
| |PDF (930 KB)

The shielding blanket (SB) system is to provide neutron shielding for Chinese fusion engineering test reactor in-vessel components and the external environment. The SB concept design activities have been carried out during the 2009-2011 campaign. Current design on the SB system is concentrated on neutronics analysis, SB modules design, and mechanics analysis using finite-element method. The neutro... View full abstract»

• ### Comparison of Deformation Models of Flexible Manipulator Joints for Use in DEMO

Publication Year: 2018, Page(s):1 - 7
| |PDF (2404 KB)

The joint deformation contributes significantly to final end-effector displacement of a manipulator, especially when the manipulator is in the form a serial kinematics with long links. When the manipulators employed in the DEMO are under the heavy payload, the deformation of manipulator is inevitable and the magnitude is significant. In order to maneuver the large object through several via points... View full abstract»

• ### Characterization of a Laminar Plasma Plume Based on Dielectric-Barrier Discharge at Atmospheric Pressure

Publication Year: 2018, Page(s):1 - 4
| |PDF (973 KB)

With argon used as working gas, a laminar plasma plume with a fairly large volume is flushed out of a dielectric-barrier discharge device into the ambient air at atmospheric pressure. Discharge characteristics are investigated through electrical and optical methods. Results indicate that discharge power, based on Lissajous plot, increases with increasing the peak voltage. High-speed imaging indica... View full abstract»

• ### Frequency Stabilization in a Sub-Terahertz Gyrotron With Delayed Reflections of Output Radiation

Publication Year: 2018, Page(s):1 - 5
| |PDF (1109 KB)

We have studied, both theoretically and experimentally, the frequency stabilization process in a 320-GHz double-beam gyrotron with reflections of output radiation from a nonresonant remote load. In the experiments with reflections from a Teflon disk located at a distance of 3.5 m from the gyrotron output, a twofold increase in frequency stability compared with the case of free-running (reflectionl... View full abstract»

• ### Implementation of an Excitation Controller for an Impulse Motor-Generator

Publication Year: 2018, Page(s):1 - 5
| |PDF (1227 KB)

Three flywheel energy-stored impulse motor-generators (MGs) are used in the power supply system of HL-2A tokamak to produce short high-voltage or high-current pulse of desired parameters that are usually used for magnetic field coils and auxiliary heating equipment loads. The operation changing of these loads will cause disturbances in generator's terminal voltage and the remarkable drop in MG's r... View full abstract»

• ### Effects of Reduced Electric Field on Sulfur Hexafluoride Removal for a Double Dielectric Barrier Discharge Reactor

Publication Year: 2018, Page(s):1 - 8
| |PDF (1612 KB)

Sulfur hexafluoride (SF₆) is a greenhouse gas with very high global warming potential. This paper investigated the effects of reduced electric field, E/N, on SF₆ abatement by using a coaxial double-layer dielectric barrier discharge (DBD) reactor. The concentration of SF₆ was 2%, and the remaining 98% of the feed gas is He/water vapor. The reduced electric field ... View full abstract»

## Aims & Scope

IEEE Transactions on Plasma Sciences focuses on plasma science and engineering, including: magnetofluid dynamics and thermionics; plasma dynamics; gaseous electronics and arc technology.

Full Aims & Scope

## Meet Our Editors

Editor-in-Chief
Steven J. Gitomer, Ph.D.
Senior Scientist, US Civilian Research & Development Foundation
Guest Scientist, Los Alamos National Laboratory
1428 Miracerros Loop South
Santa Fe, NM  87505  87505  USA
tps-editor@ieee.org
Phone:505-988-5751
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