cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.57760/sciencedb.04433
title: The effects of E-r x B-t drift on LH wave coupling with divertor configuration at EAST
title: The effects of E-r x B-t drift on LH wave coupling with divertor configuration at EAST

description: The coupling characteristics of the 4.6 GHz lower hybrid (LH) grill and the factors affecting LH wave coupling, mainly Er × Bt drift, with divertor configuration in anti-clockwise/clockwise magnetic field direction are studied. Based on the Langmuir probe measurement, the relationship between the reflection coefficient (RC) of LH power and the edge density at the grill mouth (ne,grill) measured by Langmuir probes is investigated. The optimum LH wave coupling with RC less than 2% is achieved when ne,grill is in the range of 1 × 1018 m-3–2 × 1018 m-3, which is quite close to the theoretically predicted value. In addition, the experimental results show that Er × Bt drift in the divertor scrape off layer plays a dominant role in affecting ne,grill and LH wave coupling. Studies show that the discrepancy in ne,grill and LH wave coupling in different magnetic field directions is mainly attributed to the different directions of Er × Bt drift, whereas the corresponding discrepancy with different plasma currents is mainly ascribed to the change in Er × Bt drift intensity. Therefore, for the upper single null divertor configuration, a lower/higher plasma currents is more favorable for increasing ne,grill and improving LH wave coupling in anti-clockwise/clockwise Bt. The above studies are of great significance for optimizing and improving LH wave coupling in the extension of the plasma operation regime.
description: The coupling characteristics of the 4.6 GHz lower hybrid (LH) grill and the factors affecting LH wave coupling, mainly Er × Bt drift, with divertor configuration in anti-clockwise/clockwise magnetic field direction are studied. Based on the Langmuir probe measurement, the relationship between the reflection coefficient (RC) of LH power and the edge density at the grill mouth (ne,grill) measured by Langmuir probes is investigated. The optimum LH wave coupling with RC less than 2% is achieved when ne,grill is in the range of 1 × 1018 m-3–2 × 1018 m-3, which is quite close to the theoretically predicted value. In addition, the experimental results show that Er × Bt drift in the divertor scrape off layer plays a dominant role in affecting ne,grill and LH wave coupling. Studies show that the discrepancy in ne,grill and LH wave coupling in different magnetic field directions is mainly attributed to the different directions of Er × Bt drift, whereas the corresponding discrepancy with different plasma currents is mainly ascribed to the change in Er × Bt drift intensity. Therefore, for the upper single null divertor configuration, a lower/higher plasma currents is more favorable for increasing ne,grill and improving LH wave coupling in anti-clockwise/clockwise Bt. The above studies are of great significance for optimizing and improving LH wave coupling in the extension of the plasma operation regime.
DOI: 10.57760/sciencedb.04442
title: Experimental study on the magnetic coherent mode in the H-mode pedestal of EAST
title: EAST装置H模台基区磁相干模的实验研究

description: The data associated with the published article "Experimental study on the magnetic coherent mode in the H-mode pedestal of EAST"
description: The data associated with the published article "Experimental study on the magnetic coherent mode in the H-mode pedestal of EAST"
DOI: 10.57760/sciencedb.04443
title: Enhanced bioproduction of fucosylated oligosaccharide 3-fucosyllactose in engineered Escherichia coli with an improved de novo pathway
title: Enhanced bioproduction of fucosylated oligosaccharide 3-fucosyllactose in engineered Escherichia coli with an improved de novo pathway

description: This data set contains the original data and the charts drawn in this paper 
description: This data set contains the original data and the charts drawn in this paper
DOI: 10.57760/sciencedb.04444
title: Observation of a fully non-inductive H-mode regime dominated by the sporadic-small edge-localized modes in EAST with a tungsten divertor
title: EAST钨偏滤器条件下零星小幅度边界局域模主导的完全非感应高约束模的实验观测

description: The data associated with the article "Observation of a fully non-inductive H-mode regime dominated by the sporadic-small edge-localized modes in EAST with a tungsten divertor"
description: The data associated with the article "Observation of a fully non-inductive H-mode regime dominated by the sporadic-small edge-localized modes in EAST with a tungsten divertor"
DOI: 10.57760/sciencedb.04447
title: Review of recent experimental and modeling advances in the understanding of lower hybrid current drive in ITER-relevant regimes
title: Review of recent experimental and modeling advances in the understanding of lower hybrid current drive in ITER-relevant regimes

description: Progress in understanding lower hybrid current drive (LHCD) at high density has been made through experiments and modeling, which is encouraging given the need for an efficient off-axis current profile control technique in burning plasma. By reducing the wall recycling of neutrals, the edge temperature is increased and the effect of parametric instability (PI) and collisional absorption (CA) is reduced, which is beneficial for increasing the current drive efficiency. Strong single pass absorption is preferred to prevent CA and high LH operating frequency is essential for wave propagation to the core region at high density, presumably to mitigate the effect of PI. The dimensionless parameter that characterizes LH wave accessibility and wave refraction for the experiments in this joint study is shown to bracket the region in parameter space where ITER LHCD experiments will operate in the steady state scenario phase. Further joint experiments and cross modeling are necessary to understand the LHCD physics in weak damping regimes which would increase confidence in predictions for ITER where the absorption is expected to be strong.
description: Progress in understanding lower hybrid current drive (LHCD) at high density has been made through experiments and modeling, which is encouraging given the need for an efficient off-axis current profile control technique in burning plasma. By reducing the wall recycling of neutrals, the edge temperature is increased and the effect of parametric instability (PI) and collisional absorption (CA) is reduced, which is beneficial for increasing the current drive efficiency. Strong single pass absorption is preferred to prevent CA and high LH operating frequency is essential for wave propagation to the core region at high density, presumably to mitigate the effect of PI. The dimensionless parameter that characterizes LH wave accessibility and wave refraction for the experiments in this joint study is shown to bracket the region in parameter space where ITER LHCD experiments will operate in the steady state scenario phase. Further joint experiments and cross modeling are necessary to understand the LHCD physics in weak damping regimes which would increase confidence in predictions for ITER where the absorption is expected to be strong.
DOI: 10.57760/sciencedb.04450
title: Correlation between the onset of parametric instability of lower hybrid waves and modification in edge plasma current profile on EAST
title: Correlation between the onset of parametric instability of lower hybrid waves and modification in edge plasma current profile on EAST

description: The plasma current profile modification in the edge region is observed in LHCD (lower hybrid current drive) plasmas for the first time in EAST, correlated with an increased level of PI (parametric instability) activities with the decrease in LH (lower hybrid) source frequency or the increase in plasma density. With the increase in the PI strength, an increase in the edge current is observed despite of a reduction in current drive capability. In these plasmas, strike-point splitting behaviors are also observed, implying the modification of the magnetic geometry in the scrape-off-layer. Results show the effects of LH frequency and plasma density on power dissipation in the edge region, suggesting a role of anomalous wave power damping on the modification of current profile at the plasma edge. These novel results are significant in that they give insight for the first time into how nonlinear wave-plasma interactions such as PI may directly impact the edge current profile, the control of which is critical in order to achieve optimized modes of operation in a steady state fusion reactor.
description: The plasma current profile modification in the edge region is observed in LHCD (lower hybrid current drive) plasmas for the first time in EAST, correlated with an increased level of PI (parametric instability) activities with the decrease in LH (lower hybrid) source frequency or the increase in plasma density. With the increase in the PI strength, an increase in the edge current is observed despite of a reduction in current drive capability. In these plasmas, strike-point splitting behaviors are also observed, implying the modification of the magnetic geometry in the scrape-off-layer. Results show the effects of LH frequency and plasma density on power dissipation in the edge region, suggesting a role of anomalous wave power damping on the modification of current profile at the plasma edge. These novel results are significant in that they give insight for the first time into how nonlinear wave-plasma interactions such as PI may directly impact the edge current profile, the control of which is critical in order to achieve optimized modes of operation in a steady state fusion reactor.
DOI: 10.57760/sciencedb.04477
title: Integration of full divertor detachment with improved core confinement for tokamak fusion plasmas
title: Integration of full divertor detachment with improved core confinement for tokamak fusion plasmas

description: Divertor detachment offers a promising solution to the challenge of plasma-wall interactions for steady-state operation of fusion reactors. Here, we demonstrate the excellent compatibility of actively controlled full divertor detachment with a high-performance (βN ~ 3, H98~ 1.5) core plasma, using high-βp (poloidal beta, βp &gt; 2) scenario characterized by a sustained core internal transport barrier (ITB) and a modest edge transport barrier (ETB) in DIII-D tokamak. The high-βp high-confinement scenario facilitates divertor detachment which, in turn, promotes the development of an even stronger ITB at large radius with a weaker ETB. This self-organized synergy between ITB and ETB, leads to a net gain in energy confinement, in contrast to the net confinement loss caused by divertor detachment in standard H-modes. These results show the potential of integrating excellent core plasma performance with an efficient divertor solution, an essential step towards steady-state operation of reactor-grade plasmas.
description: Divertor detachment offers a promising solution to the challenge of plasma-wall interactions for steady-state operation of fusion reactors. Here, we demonstrate the excellent compatibility of actively controlled full divertor detachment with a high-performance (βN ~ 3, H98~ 1.5) core plasma, using high-βp (poloidal beta, βp &gt; 2) scenario characterized by a sustained core internal transport barrier (ITB) and a modest edge transport barrier (ETB) in DIII-D tokamak. The high-βp high-confinement scenario facilitates divertor detachment which, in turn, promotes the development of an even stronger ITB at large radius with a weaker ETB. This self-organized synergy between ITB and ETB, leads to a net gain in energy confinement, in contrast to the net confinement loss caused by divertor detachment in standard H-modes. These results show the potential of integrating excellent core plasma performance with an efficient divertor solution, an essential step towards steady-state operation of reactor-grade plasmas.
DOI: 10.57760/sciencedb.04484
title: A dataset of Xingquan WU et al 2018 Plasma Sci. Technol. 20 094003
title: 论文Xingquan WU et al 2018 Plasma Sci. Technol. 20 094003的数据

description: This paper is concerned as a numerical model research. The model research does not involve the actual experimental data. The data in the figure of the paper are all generated by the physical model described in the paper through numerical calculation. Numerical calculation of model code based on Matlab.The model code and its related data will be uploaded here.
description: This paper is concerned as a numerical model research. The model research does not involve the actual experimental data. The data in the figure of the paper are all generated by the physical model described in the paper through numerical calculation. Numerical calculation of model code based on Matlab.The model code and its related data will be uploaded here.
DOI: 10.57760/sciencedb.04453
title: Physics and engineering design of 400 keV H- accelerator for negative ion based neutral beam injection system in China
title: Physics and engineering design of 400 keV H- accelerator for negative ion based neutral beam injection system in China

description: A research project of the CFETR Negative ion-based Neutral Beam Injection (NNBI) prototype has be started in China. The objectives of the CFETR NNBI prototype are to produce a negative hydrogen ion beam of &gt;20 A up to 400 keV for 3600 s and to attain a neutralization efficiency of &gt;50%. In order to identify and optimize the design of the negative ion accelerator, a self-consistent model has been developed to consider all key physics and engineering issues (electric and magnetic field, background gas flow, beam optics, beam-gas interaction, secondary particles trajectories, power deposition on grids, heat removal design, and mounting pattern). This paper presents the primary results by applying the self-consistent model to the current design of the 400 keV H- accelerator of the CFETR NNBI prototype.
description: A research project of the CFETR Negative ion-based Neutral Beam Injection (NNBI) prototype has be started in China. The objectives of the CFETR NNBI prototype are to produce a negative hydrogen ion beam of &gt;20 A up to 400 keV for 3600 s and to attain a neutralization efficiency of &gt;50%. In order to identify and optimize the design of the negative ion accelerator, a self-consistent model has been developed to consider all key physics and engineering issues (electric and magnetic field, background gas flow, beam optics, beam-gas interaction, secondary particles trajectories, power deposition on grids, heat removal design, and mounting pattern). This paper presents the primary results by applying the self-consistent model to the current design of the 400 keV H- accelerator of the CFETR NNBI prototype.
DOI: 10.57760/sciencedb.04461
title: Power Quality Analysis for Poloidal Field Power Supply System in EAST
title: Power Quality Analysis for Poloidal Field Power Supply System in EAST

description: Power quality is analyzed for the poloidal field (PF) power supply system of the Experimental Advanced Superconducting Tokamak (EAST) device. It is found that the power quality is quite different when the four-quarter PF power system is working in different operation modes. The (6k±1)’th (k is the odd number) harmonics are dominant during the electricity-cost phase while the (6k±1)’th (k is the even number) harmonics exist abundantly during the electricity-generation stage. In addition, fast Fourier transform as the data analysis method is applied to process harmonics and interharmonics. The experimental results present the characteristics of waveform and of current and power, and they show the emission features of harmonics and interharmonics, which leads to the conclusion that the energy of interharmonics and spectrum leakage caused by the harmonic clustering algorithm is recovered to an integer or that the picket fence effect results in the spectrum leakage of interharmonics.
description: Power quality is analyzed for the poloidal field (PF) power supply system of the Experimental Advanced Superconducting Tokamak (EAST) device. It is found that the power quality is quite different when the four-quarter PF power system is working in different operation modes. The (6k±1)’th (k is the odd number) harmonics are dominant during the electricity-cost phase while the (6k±1)’th (k is the even number) harmonics exist abundantly during the electricity-generation stage. In addition, fast Fourier transform as the data analysis method is applied to process harmonics and interharmonics. The experimental results present the characteristics of waveform and of current and power, and they show the emission features of harmonics and interharmonics, which leads to the conclusion that the energy of interharmonics and spectrum leakage caused by the harmonic clustering algorithm is recovered to an integer or that the picket fence effect results in the spectrum leakage of interharmonics.
DOI: 10.57760/sciencedb.04459
title: Hefei utility negative ions test equipment with RF source: commissioning and first results
title: Hefei utility negative ions test equipment with RF source: commissioning and first results

description: In order to study the key technology and physics of RF driven negative ion source for neutral beam injector in China, the Hefei utility negative ions test equipment with RF source wasdeveloped at Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP). Its negative ion source can be equipped with single or double RF drivers. There is a plasma expansionchamber with depth of 19 mm and an enhanced filter field. A three electrodes negative ion accelerator was employed to extract and accelerate the negative ions, which are plasma grid,extraction grid and ground grid. And there are several diagnostic tools for the plasma and beam parameters measurement. The characteristics of plasma generation, negative ion production andextraction were studied on the test equipment. The negative ion beam was extracted from the RF driven negative ion source for the first time. The detailed structure and main results are presented in this article.
description: In order to study the key technology and physics of RF driven negative ion source for neutral beam injector in China, the Hefei utility negative ions test equipment with RF source wasdeveloped at Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP). Its negative ion source can be equipped with single or double RF drivers. There is a plasma expansionchamber with depth of 19 mm and an enhanced filter field. A three electrodes negative ion accelerator was employed to extract and accelerate the negative ions, which are plasma grid,extraction grid and ground grid. And there are several diagnostic tools for the plasma and beam parameters measurement. The characteristics of plasma generation, negative ion production andextraction were studied on the test equipment. The negative ion beam was extracted from the RF driven negative ion source for the first time. The detailed structure and main results are presented in this article.
DOI: 10.57760/sciencedb.04575
title: RNA seq data of WT and nanog mutant egg
title: RNA seq data of WT and nanog mutant egg

description: we conducted RNA sequencing (RNA-seq) analysis between nanog mutant eggs and WT eggs. A total of 137 genes are differentially expressed between mutant and WT eggs, with 74 upregulated genes and 63 downregulated genes in mutant eggs.
description: we conducted RNA sequencing (RNA-seq) analysis between nanog mutant eggs and WT eggs. A total of 137 genes are differentially expressed between mutant and WT eggs, with 74 upregulated genes and 63 downregulated genes in mutant eggs.
DOI: 10.57760/sciencedb.04466
title: Experimental and simulation study of impurity transport response to RMPs in RF-heated H-mode plasmas at EAST
title: Experimental and simulation study of impurity transport response to RMPs in RF-heated H-mode plasmas at EAST

description: Spatial profiles of impurity emission measurements in the extreme ultraviolet (EUV) spectroscopic range in radiofrequency (RF)-heated discharges are combined with one-dimensional and three-dimensional transport simulations to study the effects of resonant magnetic perturbations (RMPs) on core impurity accumulation at EAST.
description: Spatial profiles of impurity emission measurements in the extreme ultraviolet (EUV) spectroscopic range in radiofrequency (RF)-heated discharges are combined with one-dimensional and three-dimensional transport simulations to study the effects of resonant magnetic perturbations (RMPs) on core impurity accumulation at EAST.
DOI: 10.57760/sciencedb.04467
title: Development of a Utility Negative Ion Test Equipment With RF Source at ASIPP
title: Development of a Utility Negative Ion Test Equipment With RF Source at ASIPP

description: An RF-driven negative-ion source development program has been started at ASIPP-Hefei with a small test equipment, Hefei utility negative ion test equipment with RF source (HUNTER). It is devoted to some crucial issues of the RF-driven negative-ion source, such as the improvement of RF efficiency, the enhancement of the extracted negative-ion current density, and the promotion of the beam qualities. In the initial stage, the HUNTER negative-ion source conservatively adopted a similar structure of the ITER prototype source developed at IPP, Garching. It consists of single or double RF driver on the back side of a plasma expansion chamber, and a negative ion accelerator which is able to extract 120 beamlets up to 60 kV for 10 s. In the first phase operation of the HUNTER-ion source, a low-pressure (0.3 Pa) plasma has been successfully achieved by coupling 46-kW RF input power and different plasma parameters have been measured by using Langmuir probes and optical emission spectroscopy. Besides the negative-ion source, the HUNTER comprises the vacuum vessel, the special cooling system, the power supply system, and the source plasma and beam diagnostic system are also ready for the next phase operation of hydrogen negative ion beam extraction.
description: An RF-driven negative-ion source development program has been started at ASIPP-Hefei with a small test equipment, Hefei utility negative ion test equipment with RF source (HUNTER). It is devoted to some crucial issues of the RF-driven negative-ion source, such as the improvement of RF efficiency, the enhancement of the extracted negative-ion current density, and the promotion of the beam qualities. In the initial stage, the HUNTER negative-ion source conservatively adopted a similar structure of the ITER prototype source developed at IPP, Garching. It consists of single or double RF driver on the back side of a plasma expansion chamber, and a negative ion accelerator which is able to extract 120 beamlets up to 60 kV for 10 s. In the first phase operation of the HUNTER-ion source, a low-pressure (0.3 Pa) plasma has been successfully achieved by coupling 46-kW RF input power and different plasma parameters have been measured by using Langmuir probes and optical emission spectroscopy. Besides the negative-ion source, the HUNTER comprises the vacuum vessel, the special cooling system, the power supply system, and the source plasma and beam diagnostic system are also ready for the next phase operation of hydrogen negative ion beam extraction.
DOI: 10.57760/sciencedb.04470
title: Simulation of the multi-channel motional Stark effect diagnostic on EAST Tokamak
title: Simulation of the multi-channel motional Stark effect diagnostic on EAST Tokamak

description: A multi-channel motional Stark effect (MSE) diagnostic is under development for providing accurate information of the internal magnetic field on EAST tokamak. To assist the ongoing design and implementation of the diagnostic, an optimization study is performed using ALCBEAM and NBASS codes.
description: A multi-channel motional Stark effect (MSE) diagnostic is under development for providing accurate information of the internal magnetic field on EAST tokamak. To assist the ongoing design and implementation of the diagnostic, an optimization study is performed using ALCBEAM and NBASS codes.