Research Paper In Science And Technology

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Introducing Prof. Dr Yunfeng LIANG as Editor-in-Chief of Plasma Science and Technology (PST)
We are delighted to announce the appointment of Prof. Dr Yunfeng LIANG, from Institute of Energy and Climate Research—Plasma Physics (IEK-4), Forschungszentrum Jülich, Germany, as Editor-in-Chief for PST from March 2017. Prof. Dr Yunfeng LIANG is a senior scientist and group leader of 3D edge plasma physics and stellarator physics, IEK-4, Forschungszentrum Jülich. His research interests are 3D plasma-wall-interaction in fusion devices, 3D edge and divertor plasma physics in magnetically confined hot plasmas, physics and control of magnetohydrodynamic stability and transport in fusion plasmas, and development of high-temperature plasma diagnostics. Please join us in welcoming Prof. Dr Yunfeng LIANG to PST.

Highlights of 2017
A selection of free-to-read papers that highlight the very best research published in Plasma Science and Technology in 2017. All these articles are free to read until 31 December 2018.

Founded in 1999, PST publishes important, novel, helpful and thought-provoking progress in the strongly multidisciplinary and interdisciplinary fields related to plasma science and technology.

Plasma Science and Technology achieves its highest ever Impact Factor
Plasma Science and Technology is celebrating an increase in Impact Factor to 0.83, as reported in the 2016 Journal Citation Reports published by Thomson Reuters. With this increase in Impact Factor of 26%, the journal records its highest ever Impact Factor.

We would like to take this opportunity to thank the authors, readers and referees of the journal as well as our publishing partners for contributing to the journal's popularity.

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Electrodeless plasma thrusters for spacecraft: a review

S N BATHGATE et al 2017 Plasma Sci. Technol.19 083001

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The physics of electrodeless electric thrusters that use directed plasma to propel spacecraft without employing electrodes subject to plasma erosion is reviewed. Electrodeless plasma thrusters are potentially more durable than presently deployed thrusters that use electrodes such as gridded ion, Hall thrusters, arcjets and resistojets. Like other plasma thrusters, electrodeless thrusters have the advantage of reduced fuel mass compared to chemical thrusters that produce the same thrust. The status of electrodeless plasma thrusters that could be used in communications satellites and in spacecraft for interplanetary missions is examined. Electrodeless thrusters under development or planned for deployment include devices that use a rotating magnetic field; devices that use a rotating electric field; pulsed inductive devices that exploit the Lorentz force on an induced current loop in a plasma; devices that use radiofrequency fields to heat plasmas and have magnetic nozzles to accelerate the hot plasma and other devices that exploit the Lorentz force. Using metrics of specific impulse and thrust efficiency, we find that the most promising designs are those that use Lorentz forces directly to expel plasma and those that use magnetic nozzles to accelerate plasma.

https://doi.org/10.1088/2058-6272/aa71feCited byReferences

Realization of minute-long steady-state H-mode discharges on EAST

Xianzu GONG et al 2017 Plasma Sci. Technol.19 032001

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In the 2016 EAST experimental campaign, a steady-state long-pulse H-mode discharge with an ITER-like tungsten divertor lasting longer than one minute has been obtained using only RF heating and current drive, through an integrated control of the wall conditioning, plasma configuration, divertor heat flux, particle exhaust, impurity management, and effective coupling of multiple RF heating and current drive sources at high injected power. The plasma current ( Ip ∼ 0.45 MA) was fully-noninductively driven ( Vloop < 0.0 V) by a combination of ∼2.5 MW LHW, ∼0.4 MW ECH and ∼0.8 MW ICRF. This result demonstrates the progress of physics and technology studies on EAST, and will benefit the physics basis for steady state operation of ITER and CFETR.

https://doi.org/10.1088/2058-6272/19/3/032001Cited byReferences

Measurement of electron density and electron temperature of a cascaded arc plasma using laser Thomson scattering compared to an optical emission spectroscopic approach

Yong WANG et al 2017 Plasma Sci. Technol.19 115403

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As advanced linear plasma sources, cascaded arc plasma devices have been used to generate steady plasma with high electron density, high particle flux and low electron temperature. To measure electron density and electron temperature of the plasma device accurately, a laser Thomson scattering (LTS) system, which is generally recognized as the most precise plasma diagnostic method, has been established in our lab in Dalian University of Technology. The electron density has been measured successfully in the region of 4.5 × 10 19 m −3 to 7.1 × 10 20 m −3 and electron temperature in the region of 0.18 eV to 0.58 eV. For comparison, an optical emission spectroscopy (OES) system was established as well. The results showed that the electron excitation temperature (configuration temperature) measured by OES is significantly higher than the electron temperature (kinetic electron temperature) measured by LTS by up to 40% in the given discharge conditions. The results indicate that the cascaded arc plasma is recombining plasma and it is not in local thermodynamic equilibrium (LTE). This leads to significant error using OES when characterizing the electron temperature in a non-LTE plasma.

https://doi.org/10.1088/2058-6272/aa861dReferences

Dynamic behavior of a rotating gliding arc plasma in nitrogen: effects of gas flow rate and operating current

Hao ZHANG et al 2017 Plasma Sci. Technol.19 045401

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The effects of feed gas flow rate and operating current on the electrical characteristics and dynamic behavior of a rotating gliding arc (RGA) plasma codriven by a magnetic field and tangential flow were investigated. The operating current has been shown to significantly affect the time-resolved voltage waveforms of the discharge, particularly at flow rate = 2 l min −1. When the current was lower than 140 mA, sinusoidal waveforms with regular variation periods of 13.5–17.0 ms can be observed (flow rate = 2 l min −1). The restrike mode characterized by serial sudden drops of voltage appeared under all studied conditions. Increasing the flow rate from 8 to 12 l min −1 (at the same current) led to a shift of arc rotation mode which would then result in a significant drop of discharge voltage (around 120–200 V). For a given flow rate, the reduction of current resulted in a nearly linear increase of voltage.

https://doi.org/10.1088/2058-6272/aa57f3Cited byReferences

Laser-induced plasma electron number density: Stark broadening method versus the Saha–Boltzmann equation

Arnab Sarkar and Manjeet Singh 2017 Plasma Sci. Technol.19 025403

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We report spectroscopic studies on plasma electron number density of laser-induced plasma produced by ns–Nd:YAG laser light pulses on an aluminum sample in air at atmospheric pressure. The effect of different laser energy and the effect of different laser wavelengths were compared. The experimentally observed line profiles of neutral aluminum have been used to extract the excitation temperature using the Boltzmann plot method, whereas the electron number density has been determined from the Stark broadened as well as using the Saha–Boltzmann equation (SBE). Each approach was also carried out by using the Al emission line and Mg emission lines. It was observed that the SBE method generated a little higher electron number density value than the Stark broadening method, but within the experimental uncertainty range. Comparisons of Ne determined by the two methods show the presence of a linear relation which is independent of laser energy or laser wavelength. These results show the applicability of the SBE method for Ne determination, especially when the system does not have any pure emission lines whose electron impact factor is known. Also use of Mg lines gives superior results than Al lines.

https://doi.org/10.1088/2058-6272/19/2/025403References

The influence of grounded electrode positions on the evolution and characteristics of an atmospheric pressure argon plasma jet

Bo ZHANG et al 2017 Plasma Sci. Technol.19 064001

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An atmospheric pressure plasma jet (APPJ) in Ar with various grounded electrode arrangements is employed to investigate the effects of electrode arrangement on the characteristics of the APPJ. Electrical and optical methods are used to characterize the plasma properties. The discharge modes of the APPJ with respect to applied voltage are studied for grounded electrode positions of 10 mm, 40 mm and 80 mm, respectively, and the main discharge and plasma parameters are investigated. It is shown that an increase in the distance between the grounded electrode and high-voltage electrode results in a change in the discharge modes and discharge parameters. The discharges transit from having two discharge modes, dielectric barrier discharge (DBD) and jet, to having three, corona, DBD and jet, with increase in the distance from the grounded to the high-voltage electrodes. The maximum length of the APPJ reaches 3.8 cm at an applied voltage of 8 kV. The discharge power and transferred charges and spectral line intensities for species in the APPJ are influenced by the positions of the grounded electrode, while there is no obvious difference in the values of the electron excited temperature (EET) for the three grounded electrode positions.

https://doi.org/10.1088/2058-6272/aa629fCited byReferences

Growth of 4'' diameter polycrystalline diamond wafers with high thermal conductivity by 915 MHz microwave plasma chemical vapor deposition

A F POPOVICH et al 2017 Plasma Sci. Technol.19 035503

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Polycrystalline diamond (PCD) films 100 mm in diameter are grown by 915 MHz microwave plasma chemical vapor deposition (MPCVD) at different process parameters, and their thermal conductivity (TC) is evaluated by a laser flash technique (LFT) in the temperature range of 230–380 K. The phase purity and quality of the films are assessed by micro-Raman spectroscopy based on the diamond Raman peak width and the amorphous carbon (a-C) presence in the spectra. Decreasing and increasing dependencies for TC with temperature are found for high and low quality samples, respectively. TC, as high as 1950 ± 230 W m −1 K −1 at room temperature, is measured for the most perfect material. A linear correlation between the TC at room temperature and the fraction of the diamond component in the Raman spectrum for the films is established.

https://doi.org/10.1088/2058-6272/19/3/035503Cited byReferences

Particle-in-cell/Monte Carlo simulation of filamentary barrier discharges

Weili FAN et al 2017 Plasma Sci. Technol.19 115401

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The plasma behavior of filamentary barrier discharges in helium is simulated using a two-dimensional (2D) particle-in-cell/Monte Carlo model. Four different phases have been suggested in terms of the development of the discharge: the Townsend phase; the space-charge dominated phase; the formation of the cathode layer, and the extinguishing phase. The spatial-temporal evolution of the particle densities, velocities of the charged particles, electric fields, and surface charges has been demonstrated. Our simulation provides insights into the underlying mechanism of the discharge and explains many dynamical behaviors of dielectric barrier discharge (DBD) filaments.

https://doi.org/10.1088/2058-6272/aa808cReferences

High-energy-density electron beam generation in ultra intense laser-plasma interaction

Jianxun Liu (刘建勋) et al 2017 Plasma Sci. Technol.19 015001

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By using a two-dimensional particle-in-cell simulation, we demonstrate a scheme for high-energy-density electron beam generation by irradiating an ultra intense laser pulse onto an aluminum (Al) target. With the laser having a peak intensity of 4 × 10 23 W cm −2, a high quality electron beam with a maximum density of 117 nc and a kinetic energy density up to 8.79 × 10 18 J m −3 is generated. The temperature of the electron beam can be 416 MeV, and the beam divergence is only 7.25°. As the laser peak intensity increases (e.g., 10 24 W cm −2), both the beam energy density (3.56 × 10 19 J m −3) and the temperature (545 MeV) are increased, and the beam collimation is well controlled. The maximum density of the electron beam can even reach 180 nc. Such beams should have potential applications in the areas of antiparticle generation, laboratory astrophysics, etc.

https://doi.org/10.1088/1009-0630/19/1/015001References

Understanding L–H transition in tokamak fusion plasmas

Guosheng XU and Xingquan WU 2017 Plasma Sci. Technol.19 033001

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This paper reviews the current state of understanding of the L–H transition phenomenon in tokamak plasmas with a focus on two central issues: (a) the mechanism for turbulence quick suppression at the L–H transition; (b) the mechanism for subsequent generation of sheared flow. We briefly review recent advances in the understanding of the fast suppression of edge turbulence across the L–H transition. We uncover a comprehensive physical picture of the L–H transition by piecing together a number of recent experimental observations and insights obtained from 1D and 2D simulation models. Different roles played by diamagnetic mean flow, neoclassical-driven mean flow, turbulence-driven mean flow, and turbulence-driven zonal flows are discussed and clarified. It is found that the L–H transition occurs spontaneously mediated by a shift in the radial wavenumber spectrum of edge turbulence, which provides a critical evidence for the theory of turbulence quench by the flow shear. Remaining questions and some key directions for future investigations are proposed.

https://doi.org/10.1088/2058-6272/19/3/033001Cited byReferences

View all abstracts

Realization of minute-long steady-state H-mode discharges on EAST

Xianzu GONG et al 2017 Plasma Sci. Technol.19 032001

View abstractView articlePDF

In the 2016 EAST experimental campaign, a steady-state long-pulse H-mode discharge with an ITER-like tungsten divertor lasting longer than one minute has been obtained using only RF heating and current drive, through an integrated control of the wall conditioning, plasma configuration, divertor heat flux, particle exhaust, impurity management, and effective coupling of multiple RF heating and current drive sources at high injected power. The plasma current ( Ip ∼ 0.45 MA) was fully-noninductively driven ( Vloop < 0.0 V) by a combination of ∼2.5 MW LHW, ∼0.4 MW ECH and ∼0.8 MW ICRF. This result demonstrates the progress of physics and technology studies on EAST, and will benefit the physics basis for steady state operation of ITER and CFETR.

https://doi.org/10.1088/2058-6272/19/3/032001Cited byReferences

Multichannel Microwave Interferometer for Simultaneous Measurement of Electron Density and its Fluctuation on HL-2A Tokamak

Shi Peiwan et al 2016 Plasma Sci. Technol.18 708

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A multichannel microwave interferometer system has been developed on the HL-2A tokomak. Its working frequency is well designed to avoid the fringe jump effect. Taking the structure of HL-2A into account, its antennas are installed in the horizontal direction, i.e. one launcher in high field side (HFS) and four receivers in low field side (LFS). The fan-shaped measurement area covers those regions where the magnetohydrodynamics (MHD) instabilities are active. The heterodyne technique contributes to its high temporal resolution (1 μs). It is possible for the multichannel system to realize simultaneous measurements of density and its fluctuation. The quadrature phase detection based on the zero-crossing method is introduced to density measurement. With this system, reliable line-averaged densities and density profiles are obtained. The location of the saturated internal kink mode can be figured out from the mode showing different intensities on four channels, and the result agrees well with that measured by electron cyclotron emission imaging (ECEI).

https://doi.org/10.1088/1009-0630/18/7/02Cited byReferences

Effect of Cold Plasma on Cell Viability and Collagen Synthesis in Cultured Murine Fibroblasts

Shi Xingmin et al 2016 Plasma Sci. Technol.18 353

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An argon atmospheric pressure plasma jet was employed to treat L929 murine fibroblasts cultured in vitro. Experimental results showed that, compared with the control cells, the treatment of fibroblasts with 15 s of plasma led to a significant increase of cell viability and collagen synthesis, while the treatment of 25 s plasma resulted in a remarkable decrease. Exploration of related mechanisms suggested that cold plasma could up-regulate CyclinD1 gene expression and down-regulate p27 gene expression at a low dose, while it could down-regulate CyclinD1 expression and up-regulate p27 expression at a higher dose, thus altering the cell cycle progression, and then affecting cell viability and collagen synthesis of fibroblasts.

https://doi.org/10.1088/1009-0630/18/4/04Cited byReferences

Atmospheric-Pressure DBD Cold Plasma for Preparation of High Active Au/P25 Catalysts for Low-Temperature CO Oxidation

Di Lanbo et al 2016 Plasma Sci. Technol.18 544

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Cold plasma generated by dielectric barrier discharge (DBD) at atmospheric pressure was adopted for preparation of commercial TiO 2 Degussa P25 supported Au catalysts (Au/P25-P) with the assistance of the deposition-precipitation procedure. The influences of the plasma reduction time and calcination on the performance of the Au/P25-P catalysts were investigated. CO oxidation was performed to investigate the catalytic activity of the Au/P25 catalysts. The results show that DBD cold plasma for the fabrication of Au/P25-P catalysts is a fast process, and Au/P25-P (4 min) exhibited the highest CO oxidation activity due to the complete reduction of Au compounds and less consumption of oxygen vacancies. In order to form more oxygen vacancies active species, Au/P25-P was calcined to obtain Au/P25-PC catalysts. Interestingly, Au/P25-PC exhibited the highest activity for CO oxidation among the Au/P25 samples. The results of transmission electron microscopy (TEM) indicated that the smaller size and high distribution of Au nanoparticles are the mean reasons for a high performance of Au/P25-PC. Atmospheric-pressure DBD cold plasma was proved to be of great efficiency in preparing high performance supported Au catalysts.

https://doi.org/10.1088/1009-0630/18/5/17Cited byReferences

Development and Preliminary Commissioning Results of a Long Pulse 140 GHz ECRH System on EAST Tokamak (Invited)

Xu Handong et al 2016 Plasma Sci. Technol.18 442

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A long pulse electron cyclotron resonance heating (ECRH) system has been developed to meet the requirements of steady-state operation for the EAST superconducting tokamak, and the first EC wave was successfully injected into plasma during the 2015 spring campaign. The system is mainly composed of four 140 GHz gyrotron systems, 4 ITER-Like transmission lines, 4 independent channel launchers and corresponding power supplies, a water cooling, control & inter-lock system etc. Each gyrotron is expected to deliver a maximum power of 1 MW and be operated at 100-1000 s pulse lengths. The No.1 and No.2 gyrotron systems have been installed. In the initial commissioning, a series of parameters of 1 MW 1 s, 900 kW 10 s, 800 kW 95 s and 650 kW 753 s have been demonstrated successfully on the No.1 gyrotron system based on calorimetric dummy load measurements. Significant plasma heating and MHD instability suppression effects were observed in EAST experiments. In addition, high confinement (H-mode) discharges triggered by ECRH were obtained.

https://doi.org/10.1088/1009-0630/18/4/19Cited byReferences

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Effect of plasma absorption on dust lattice waves in hexagonal dust crystals

Kerong HE et al 2018 Plasma Sci. Technol.20 045001

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In the present paper, the effect of plasma absorption on lattice waves in 2D hexagonal dust crystals is investigated. The dispersion relations with the effect of plasma absorption are derived. It is found that the temperature effect (electron-to-ion temperature ratio τ) enhances the frequency of the dust lattice waves, while the spatial effect (dimensionless Debye shielding parameter weakens the frequency of the dust lattice waves. In addition, the system stabilities under the conditions of plasma absorption are studied. It is found that the temperature effect narrows the range of instability, while the spatial effect extends this range. And the range of instability is calculated, i.e. the system will always in the stable state regardless of the value of when τ > 3.5. However, the system will be unstable when τ = 1 and .

https://doi.org/10.1088/2058-6272/aaaadbReferences

Non-thermal plasma treatment as a new biotechnology in relation to seeds, dry fruits, and grains

Božena ŠERÁ and Michal ŠERÝ 2018 Plasma Sci. Technol.20 044012

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Non-thermal plasma (NTP) technology offers wide potential use in the food technology, the same as in the unconventional agriculture. Some seeds, dry fruits, grains and their sprouts gain popularity in the culinary industry as ‘raw seeds’. This review paper draws the current research and trends in NTP pre-treatment of selected seeds/fruits that are useable as ‘raw seeds’. The main applications are connected with activation of seed germination, early growth of seedlings, microbial inactivation of seed/fruit surface, and possibility of increasing quantity of biological active compounds in sprouting seeds. The paper presents a list of plant species that are able to be used as ‘raw seed’ including current information about main type of NTP treatment implemented.

https://doi.org/10.1088/2058-6272/aaacc6References

A real-time neutron-gamma discriminator based on the support vector machine method for the time-of-flight neutron spectrometer

Wei ZHANG et al 2018 Plasma Sci. Technol.20 045601

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A new neutron-gamma discriminator based on the support vector machine (SVM) method is proposed to improve the performance of the time-of-flight neutron spectrometer. The neutron detector is an EJ-299-33 plastic scintillator with pulse-shape discrimination (PSD) property. The SVM algorithm is implemented in field programmable gate array (FPGA) to carry out the real-time sifting of neutrons in neutron-gamma mixed radiation fields. This study compares the ability of the pulse gradient analysis method and the SVM method. The results show that this SVM discriminator can provide a better discrimination accuracy of 99.1%. The accuracy and performance of the SVM discriminator based on FPGA have been evaluated in the experiments. It can get a figure of merit of 1.30.

https://doi.org/10.1088/2058-6272/aaaaa9References

Plasma electrolytic liquefaction of cellulosic biomass

Dingliang TANG et al 2018 Plasma Sci. Technol.20 044002

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In this paper, the rapid liquefaction of a corncob was achieved by plasma electrolysis, providing a new method for cellulosic biomass liquefaction. The liquefaction rate of the corncob was 95% after 5 min with polyethylene glycol and glycerol as the liquefying agent. The experiments not only showed that H + ions catalyzed the liquefaction of the corncob, but also that using accelerated H + ions, which were accelerated by an electric field, could effectively improve the liquefaction efficiency. There was an obvious discharge phenomenon, in which the generated radicals efficiently heated the solution and liquefied the biomass, in the process of plasma electrolytic liquefaction. Finally, the optimum parameters of the corncob liquefaction were obtained by experimentation, and the liquefaction products were analyzed.

https://doi.org/10.1088/2058-6272/aa9563References

Interactions between multiple filaments and bacterial biofilms on the surface of an apple

He CHENG et al 2018 Plasma Sci. Technol.20 044006

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In this paper, the interactions between two dielectric barrier discharge (DBD) filaments and three bacterial biofilms are simulated. The modeling of a DBD streamer is studied by means of 2D finite element calculation. The model is described by the proper governing equations of air DBD at atmospheric pressure and room temperature. The electric field in the computing domain and the self-consistent transportation of reactive species between a cathode and biofilms on the surface of an apple are realized by solving a Poisson equation and continuity equations. The electron temperature is solved by the electron energy conservation equation. The conductivity and permittivity of bacterial biofilms are considered, and the shapes of the bacterial biofilms are irregular in the uncertainty and randomness of colony growth. The distribution of the electrons suggests that two plasma channels divide into three plasma channels when the streamer are 1 mm from the biofilms. The toe-shapes of the biofilms and the simultaneous effect of two streamer heads result in a high electric field around the biofilms, therefore the stronger ionization facilitates the major part of two streamers combined into one streamer and three streamers arise. The distribution of the reactive oxygen species and the reactive nitrogen species captured by time fluences are non-uniform due to the toe-shaped bacterial biofilms. However, the plasma can intrude into the cavities in the adjacent biofilms due to the μm-scale mean free path. The two streamers case has a larger treatment area and realizes the simultaneous treatment of three biofilms compared with one streamer case.

https://doi.org/10.1088/2058-6272/aa9d7eReferences

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Electrodeless plasma thrusters for spacecraft: a review

S N BATHGATE et al 2017 Plasma Sci. Technol.19 083001

View abstractView articlePDF

The physics of electrodeless electric thrusters that use directed plasma to propel spacecraft without employing electrodes subject to plasma erosion is reviewed. Electrodeless plasma thrusters are potentially more durable than presently deployed thrusters that use electrodes such as gridded ion, Hall thrusters, arcjets and resistojets. Like other plasma thrusters, electrodeless thrusters have the advantage of reduced fuel mass compared to chemical thrusters that produce the same thrust. The status of electrodeless plasma thrusters that could be used in communications satellites and in spacecraft for interplanetary missions is examined. Electrodeless thrusters under development or planned for deployment include devices that use a rotating magnetic field; devices that use a rotating electric field; pulsed inductive devices that exploit the Lorentz force on an induced current loop in a plasma; devices that use radiofrequency fields to heat plasmas and have magnetic nozzles to accelerate the hot plasma and other devices that exploit the Lorentz force. Using metrics of specific impulse and thrust efficiency, we find that the most promising designs are those that use Lorentz forces directly to expel plasma and those that use magnetic nozzles to accelerate plasma.

https://doi.org/10.1088/2058-6272/aa71feCited byReferences

Understanding L–H transition in tokamak fusion plasmas

Guosheng XU and Xingquan WU 2017 Plasma Sci. Technol.19 033001

View abstractView articlePDF

This paper reviews the current state of understanding of the L–H transition phenomenon in tokamak plasmas with a focus on two central issues: (a) the mechanism for turbulence quick suppression at the L–H transition; (b) the mechanism for subsequent generation of sheared flow. We briefly review recent advances in the understanding of the fast suppression of edge turbulence across the L–H transition. We uncover a comprehensive physical picture of the L–H transition by piecing together a number of recent experimental observations and insights obtained from 1D and 2D simulation models. Different roles played by diamagnetic mean flow, neoclassical-driven mean flow, turbulence-driven mean flow, and turbulence-driven zonal flows are discussed and clarified. It is found that the L–H transition occurs spontaneously mediated by a shift in the radial wavenumber spectrum of edge turbulence, which provides a critical evidence for the theory of turbulence quench by the flow shear. Remaining questions and some key directions for future investigations are proposed.

https://doi.org/10.1088/2058-6272/19/3/033001Cited byReferences

Simulation of Fusion Plasmas: Current Status and Future Direction

D A Batchelor et al 2007 Plasma Sci. Technol.9 312

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I. Introduction (Z. Lin, G. Y. Fu, J. Q. Dong)

II. Role of theory and simulation in fusion sciences
1. The Impact of theory and simulation on tokomak experiments (H. R. Wilson, T.S. Hahm and F. Zonca)
2. Tokomak Transport Physics for the Era of ITER: Issues for Simulations (P.H. Diamond and T.S. Hahm)

III. Status of fusion simulation and modeling
1. Nonlinear Governing Equations for Plasma Simulations (T. S. Hahm)
2. Equilibrium and stability (L.L. Lao, J. Manickam)
3. Transport modeling (R.E. Waltz)
4. Nonlinear MHD (G.Y. Fu)
5. Turbulence (Z. Lin and R.E. Waltz)
6. RF heating and current drive (D.A. Batchelor)
7. Edge physics Simulations (X.Q. Xu and C.S. Chang)
8. Energetic particle physics (F. Zonca, G.Y. Fu and S.J. Wang)
9. Time-dependent Integrated Modeling (R.V. Budny)
10. Validation and verification (J. Manickam)

IV. Major initiatives on fusion simulation
1. US Scientific Discovery through Advanced Computing (SciDAC) Program & Fusion Energy Science (W. Tang)
2. EU Integrated Tokamak Modelling (ITM) Task Force (A. Becoulet)
3. Fusion Simulations Activities in Japan (A. Fukuyama, N. Nakajima, Y. Kishimoto, T. Ozeki, and M. Yagi)

V. Cross-disciplinary research in fusion simulation
1. Applied mathematics: Models, Discretizations, and Solvers (D.E. Keyes)
2. Computational Science (K. Li)
3. Scientific Data and Workflow Management (S. Klasky, M. Beck, B. Ludaescher, N. Podhorszki, M.A. Vouk)
4. Collaborative tools (J. Manickam)

https://doi.org/10.1088/1009-0630/9/3/13Cited byReferences

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Realization of minute-long steady-state H-mode discharges on EAST

Xianzu GONG et al 2017 Plasma Sci. Technol.19 032001

View abstractView articlePDF

In the 2016 EAST experimental campaign, a steady-state long-pulse H-mode discharge with an ITER-like tungsten divertor lasting longer than one minute has been obtained using only RF heating and current drive, through an integrated control of the wall conditioning, plasma configuration, divertor heat flux, particle exhaust, impurity management, and effective coupling of multiple RF heating and current drive sources at high injected power. The plasma current ( Ip ∼ 0.45 MA) was fully-noninductively driven ( Vloop < 0.0 V) by a combination of ∼2.5 MW LHW, ∼0.4 MW ECH and ∼0.8 MW ICRF. This result demonstrates the progress of physics and technology studies on EAST, and will benefit the physics basis for steady state operation of ITER and CFETR.

https://doi.org/10.1088/2058-6272/19/3/032001Cited byReferences

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