cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.57760/sciencedb.04620
title: Preliminary Result of Cavity Ring-Down Spectroscopy System for Radiofrequency Negative Ion Source Test Facility
title: 射频负离子源光腔衰荡光谱诊断初步结果

description: Negative ion source is a core part of neutral beam injection system for magnetic confinement fusion devices. The density of produced hydrogen negative ions is a critical parameter of negative ion source. Cavity ring-down spectroscopy (CRDS) is an ultrasensitive absorption diagnostic technique for density measurement. Based on photo-detachment process, CRDS can measure integrated line-of-sight hydrogen negative ions density in high power ion source. CRDS diagnostic system has been applied to Hefei Utility Negative ion Test Equipment with RF source, which is now one of the references for China Fusion Engineering Test Reactor (CFETR) neutral beam injection system. Typical ring-down signals are obtained to calculate the density of hydrogen negative ions. The time evolution of hydrogen negative ions density is successfully measured. Preliminary experiments show the accurate relationship between RF power and measured hydrogen negative ions density.
description: Negative ion source is a core part of neutral beam injection system for magnetic confinement fusion devices. The density of produced hydrogen negative ions is a critical parameter of negative ion source. Cavity ring-down spectroscopy (CRDS) is an ultrasensitive absorption diagnostic technique for density measurement. Based on photo-detachment process, CRDS can measure integrated line-of-sight hydrogen negative ions density in high power ion source. CRDS diagnostic system has been applied to Hefei Utility Negative ion Test Equipment with RF source, which is now one of the references for China Fusion Engineering Test Reactor (CFETR) neutral beam injection system. Typical ring-down signals are obtained to calculate the density of hydrogen negative ions. The time evolution of hydrogen negative ions density is successfully measured. Preliminary experiments show the accurate relationship between RF power and measured hydrogen negative ions density.
DOI: 10.57760/sciencedb.04623
title: Experimental research on the effect of cesium injection into high power negative ion source
title: 大功率负离子源铯注入对负离子产额影响的实验研究

description: Cesium injection can significantly reduce the surface work function of plasma grid of Radio Frequency negative ion source, which is an effective means to promote the surface generation and improve the yield of H− ions.This study aims to find the impact of the temperature of PG and the cesium injection velocity on the yield of H− ions under cesium injection conditions. [Methods] Based on the experimental platform of high power Radio Frequency negative ion source, this paper takes the mechanism of H− ions surface generation and cesium injection as theoretical basis, and takes the current of H− ions, electron current and the relative strength of cesium characteristic spectral line as numerical basis. Under current experimental conditions, cesium injection has the best effect when temperature of PG is 180~200 ℃, and the H− ions conversion rate reached dynamic equilibrium after about 162 min, when the temperature of cesium injection is 250 ℃/270 ℃. The experimental results show that cesium injection can effectively increase the H− ions yield.
description: Cesium injection can significantly reduce the surface work function of plasma grid of Radio Frequency negative ion source, which is an effective means to promote the surface generation and improve the yield of H− ions.This study aims to find the impact of the temperature of PG and the cesium injection velocity on the yield of H− ions under cesium injection conditions. [Methods] Based on the experimental platform of high power Radio Frequency negative ion source, this paper takes the mechanism of H− ions surface generation and cesium injection as theoretical basis, and takes the current of H− ions, electron current and the relative strength of cesium characteristic spectral line as numerical basis. Under current experimental conditions, cesium injection has the best effect when temperature of PG is 180~200 ℃, and the H− ions conversion rate reached dynamic equilibrium after about 162 min, when the temperature of cesium injection is 250 ℃/270 ℃. The experimental results show that cesium injection can effectively increase the H− ions yield.
DOI: 10.57760/sciencedb.04625
title: Data for “Effects of various straw incorporation strategies on soil phosphorus fractions and transformations”
title: Data for “Effects of various straw incorporation strategies on soil phosphorus fractions and transformations”

description: soil phosphatase activities, phosphorus transformation, soil phosphorus fraction
description: soil phosphatase activities, phosphorus transformation, soil phosphorus fraction
DOI: 10.57760/sciencedb.04626
title: 大亚湾核电站温排水区域浮游植物丰度和生理
title: 大亚湾核电站温排水区域浮游植物丰度和生理

description: 大亚湾核电站温排水影响区域5个断面的调查数据，调查参数包含水温等环境因子、浮游植物丰度数据、光合生理数据和粒级结构数据。
description: 大亚湾核电站温排水影响区域5个断面的调查数据，调查参数包含水温等环境因子、浮游植物丰度数据、光合生理数据和粒级结构数据。
DOI: 10.57760/sciencedb.04641
title: Raw data-Development of the quasi-optical combiner systems for density profile reflectometers on the EAST tokamak
title: Raw data-Development of the quasi-optical combiner systems for density profile reflectometers on the EAST tokamak

description: Raw data for journal paper 'Y.M.Wang et al, Fusion Engineering and Design 148 (2019) 111286'
description: Raw data for journal paper 'Y.M.Wang et al, Fusion Engineering and Design 148 (2019) 111286'
DOI: 10.57760/sciencedb.04635
title: A dataset of investigation on the growth and properties of six garnet single crystals with large lattice constants
title: A dataset of investigation on the growth and properties of six garnet single crystals with large lattice constants

description: Large lattice constant Y3Al5O12 (YAG), Gd3Ga5O12 (GGG), Y3Sc2Ga3O12 (YSGG), Gd3Sc2Ga3O12 (GSGG), Ca0.4Mg0.25Zr0.65Gd2.6Ga4.1O12 (CaMgZr:GGG) and Gd1.17Y1.83Sc2Ga3O12 (GYSGG) substrate crystals with 2 inches in diameter were grown by the Czochralski (Cz) method, their physical, chemical and optical properties were analyzed and compared in details. The X-ray rocking curves (XRCs) illustrate that the as-grown crystals possess high crystalline quality. The lattice constants of six crystals were calculated and that of GYSGG can be easily adjusted in the range of 1.2450-1.2565 nm by changing the Gd/Y proportion. The dislocation densities on the (111)-crystalline face are about 102 cm-2 order of magnitude. The thermal conductivities of six crystals were measured to be 11.72, 8.98, 6.83, 5.45, 4.67 and 4.66 W/(m*K), respectively. It is found that the thermal expansion coefficients of six crystals can be reduced by annealing at 1000 ℃ for 60 hours. In addition, the transmission spectra show that the six crystals have excellent transparency, and the coefficients of the Sellmeier equation were fitted by the calculated refractive indices. These results of the six crystals can provide the necessary parameters and references for the selection of suitable substrate materials or laser host crystals.
description: Large lattice constant Y3Al5O12 (YAG), Gd3Ga5O12 (GGG), Y3Sc2Ga3O12 (YSGG), Gd3Sc2Ga3O12 (GSGG), Ca0.4Mg0.25Zr0.65Gd2.6Ga4.1O12 (CaMgZr:GGG) and Gd1.17Y1.83Sc2Ga3O12 (GYSGG) substrate crystals with 2 inches in diameter were grown by the Czochralski (Cz) method, their physical, chemical and optical properties were analyzed and compared in details. The X-ray rocking curves (XRCs) illustrate that the as-grown crystals possess high crystalline quality. The lattice constants of six crystals were calculated and that of GYSGG can be easily adjusted in the range of 1.2450-1.2565 nm by changing the Gd/Y proportion. The dislocation densities on the (111)-crystalline face are about 102 cm-2 order of magnitude. The thermal conductivities of six crystals were measured to be 11.72, 8.98, 6.83, 5.45, 4.67 and 4.66 W/(m*K), respectively. It is found that the thermal expansion coefficients of six crystals can be reduced by annealing at 1000 ℃ for 60 hours. In addition, the transmission spectra show that the six crystals have excellent transparency, and the coefficients of the Sellmeier equation were fitted by the calculated refractive indices. These results of the six crystals can provide the necessary parameters and references for the selection of suitable substrate materials or laser host crystals.
DOI: 10.57760/sciencedb.04631
title: Study on Cavity Ring-Down Spectroscopy in High Power Ion Source
title: 强流离子源光腔衰荡光谱应用研究

description: High power ion source is a core component of neutral beam injector for tokamak. Negative ion source is the reference source for ITER neutral beam injection system as negative ion beam has a high neutralization efficiency in high energy. Cavity ring-down spectroscopy (CRDS) is a highly sensitive optical absorption spectroscopic technique. CRDS is able to measure the absolute line-of-sight integrated density of negative hydrogen ions based on photodetachment process. Compared with laser photodetachment method and optical emission spectroscopy, CRDS is insensitive to electromagnetic interference and doesn't need plasma parameters for calculating, thus yielding reliable results. CRDS system is composed of laser, optical cavity, detector and data acquisition system. Equipment selection principle was analyzed. The basic principle of CRDS was presented, and then the analytical form of using CRDS to measure H- density was derived in detail. CRDS has already been applied to high power ion source in laboratories of Germany, Japan and Italy. Results displayed that source parameters, including pressure and power, affected H- density. H- density increased from 1016 m(-3) magnitude to 10(17) m(-3) magnitude in Cs seeded operation. The linearity between H- density and extracted current was proved by NIFS.
description: High power ion source is a core component of neutral beam injector for tokamak. Negative ion source is the reference source for ITER neutral beam injection system as negative ion beam has a high neutralization efficiency in high energy. Cavity ring-down spectroscopy (CRDS) is a highly sensitive optical absorption spectroscopic technique. CRDS is able to measure the absolute line-of-sight integrated density of negative hydrogen ions based on photodetachment process. Compared with laser photodetachment method and optical emission spectroscopy, CRDS is insensitive to electromagnetic interference and doesn't need plasma parameters for calculating, thus yielding reliable results. CRDS system is composed of laser, optical cavity, detector and data acquisition system. Equipment selection principle was analyzed. The basic principle of CRDS was presented, and then the analytical form of using CRDS to measure H- density was derived in detail. CRDS has already been applied to high power ion source in laboratories of Germany, Japan and Italy. Results displayed that source parameters, including pressure and power, affected H- density. H- density increased from 1016 m(-3) magnitude to 10(17) m(-3) magnitude in Cs seeded operation. The linearity between H- density and extracted current was proved by NIFS.
DOI: 10.57760/sciencedb.04638
title: Root-associated microbiomes of wheat under the combined effect of plant development and nitrogen fertilization
title: 植物发育和氮肥共同作用下的小麦根系微生物群落变化

description: ROC levels varied dramatically across wheat growth stages and correlated more with the bacterial community than with the fungal community. Rhizosphere SOC and SAC levels were elevated by long-term N fertilization but varied only slightly across growth stages. Variation in the microbial community structure across plant growth stages showed a decreasing trend with N fertilization level in the rhizosphere. In addition, more bacterial and fungal genera were significantly correlated in the jointing and ripening stages than in the tillering stage in the root samples. A number of bacterial genera that shifted in response to N fertilization, including Arthrobacter, Bacillus and Devosia, correlated significantly with acetic acid, oxalic acid, succinic acid and tartaric acid levels.
description: ROC levels varied dramatically across wheat growth stages and correlated more with the bacterial community than with the fungal community. Rhizosphere SOC and SAC levels were elevated by long-term N fertilization but varied only slightly across growth stages. Variation in the microbial community structure across plant growth stages showed a decreasing trend with N fertilization level in the rhizosphere. In addition, more bacterial and fungal genera were significantly correlated in the jointing and ripening stages than in the tillering stage in the root samples. A number of bacterial genera that shifted in response to N fertilization, including Arthrobacter, Bacillus and Devosia, correlated significantly with acetic acid, oxalic acid, succinic acid and tartaric acid levels.
DOI: 10.57760/sciencedb.04636
title: Development of gamma ray spectrometer with high energy and time resolutions on EAST tokamak
title: 论文图表

description: A new gamma ray spectrometer with high energy and time resolutions has been developed and installed on the EAST tokamak to study fast ion and runaway electron behaviors. The spectrometer is based on a LaBr3(Ce) scintillator detector and a fully digital data acquisition system that is based on a digitizer with digital pulse processing algorithms. The energy resolution of the spectrometer is about 3.9% at 662 keV, and the spectrometer can operate stably at a counting rate as high as 1 MHz, monitored by using a light emitting diode monitoring system. The measured gamma ray spectrum is simulated based on Geant4 and unfolded with the highresolution boosted Gold deconvolution algorithm, aiming at reconstructing the energy distribution functions of fast ions and runaway electrons.
description: A new gamma ray spectrometer with high energy and time resolutions has been developed and installed on the EAST tokamak to study fast ion and runaway electron behaviors. The spectrometer is based on a LaBr3(Ce) scintillator detector and a fully digital data acquisition system that is based on a digitizer with digital pulse processing algorithms. The energy resolution of the spectrometer is about 3.9% at 662 keV, and the spectrometer can operate stably at a counting rate as high as 1 MHz, monitored by using a light emitting diode monitoring system. The measured gamma ray spectrum is simulated based on Geant4 and unfolded with the highresolution boosted Gold deconvolution algorithm, aiming at reconstructing the energy distribution functions of fast ions and runaway electrons.
DOI: 10.57760/sciencedb.04640
title: Saturation curves of low-voltage ionization chamber for ITER at 10–30 keV
title: Saturation curves of low-voltage ionization chamber for ITER at 10–30 keV

description: It includes datas of fig.8 to fig.12 of the paper.
description: It includes datas of fig.8 to fig.12 of the paper.
DOI: 10.57760/sciencedb.04645
title: EAST #71020，#71310 Edge Charge Exchange Recombination Spectroscopy Diagnostic Impurity Spectral Analysis Spectral Data Set
title: EAST#71020，#71310边界电荷交换复合光谱诊断杂质光谱分析光谱数据集

description: The impurity spectrum analysis under the influence of CXRS diagnostic data analysis on EAST #71020，#71310 were analyzed, and the collected data under various impurity outbreaks were collected and analyzed.
description: The impurity spectrum analysis under the influence of CXRS diagnostic data analysis on EAST #71020，#71310 were analyzed, and the collected data under various impurity outbreaks were collected and analyzed.
DOI: 10.57760/sciencedb.04647
title: Progress of engineering design of CFETR diagnostics
title: Progress of engineering design of CFETR diagnostics

description: 论文图表
description: 论文图表
DOI: 10.57760/sciencedb.04659
title: A Dataset of Spectroscopy and 3.01 μm CW laser performance of Ho:YAP oxide crystal pumped by 1150 nm Raman fiber laser
title: A Dataset of Spectroscopy and 3.01 μm CW laser performance of Ho:YAP oxide crystal pumped by 1150 nm Raman fiber laser

description: We demonstrate the spectroscopy and mid-infrared laser performance on the Ho:YAP oxide crystal grown by the Czochralski method in detail. The crystal belongs to orthorhombic system of Pnmb (62) space group and shows high crystalline quality. The lifetimes of 5I6 and 5I7 levels are 0.412 and 4.485 ms, respectively. Particularly, under 1150 nm Raman fiber laser pumping, a 3.01 μm CW laser with a maximum power of 181 mW and slope-efficiency of 3.35% is achieved. The M2 factor of 1.35/1.37 indicates that the yield laser has excellent beam quality. The results reveal that the Ho:YAP crystal possesses great potential for developing efficient 3.0 μm mid-infrared lasers.
description: We demonstrate the spectroscopy and mid-infrared laser performance on the Ho:YAP oxide crystal grown by the Czochralski method in detail. The crystal belongs to orthorhombic system of Pnmb (62) space group and shows high crystalline quality. The lifetimes of 5I6 and 5I7 levels are 0.412 and 4.485 ms, respectively. Particularly, under 1150 nm Raman fiber laser pumping, a 3.01 μm CW laser with a maximum power of 181 mW and slope-efficiency of 3.35% is achieved. The M2 factor of 1.35/1.37 indicates that the yield laser has excellent beam quality. The results reveal that the Ho:YAP crystal possesses great potential for developing efficient 3.0 μm mid-infrared lasers.
DOI: 10.57760/sciencedb.04658
title: A dataset of investigation of temperature distribution and 2.79 μmlaser performance on the Er:YSGG single crystal fiber
title: A dataset of investigation of temperature distribution and 2.79 μmlaser performance on the Er:YSGG single crystal fiber

description: We demonstrate the temperature distribution and 2.79 μm laser performance in a high-quality Er:YSGG single crystal fiber (SCF) with size of Ф 0.85×8 mm3 for the first time. Compared with 2×2×8 mm3 Er:YSGG bulk crystal, the simulation results show that the center maximum temperature of Er:YSGG SCF is much lower, and the temperature rising and total thermal deformation are evidently reduced, indicating that the SCF possesses more efficient thermal dissipation. Under 970 nm laser diode pumping, a maximum output power of 636 mW with slope efficiency of 20.2% is realized. More importantly, a high beam quality factors Mx2/My2 of 1.28/1.29 is obtained, which is close to the fundamental TEM00 mode, suggesting that the Er:YSGG SCF can act as a promising candidate for mid-infrared laser seed source.
description: We demonstrate the temperature distribution and 2.79 μm laser performance in a high-quality Er:YSGG single crystal fiber (SCF) with size of Ф 0.85×8 mm3 for the first time. Compared with 2×2×8 mm3 Er:YSGG bulk crystal, the simulation results show that the center maximum temperature of Er:YSGG SCF is much lower, and the temperature rising and total thermal deformation are evidently reduced, indicating that the SCF possesses more efficient thermal dissipation. Under 970 nm laser diode pumping, a maximum output power of 636 mW with slope efficiency of 20.2% is realized. More importantly, a high beam quality factors Mx2/My2 of 1.28/1.29 is obtained, which is close to the fundamental TEM00 mode, suggesting that the Er:YSGG SCF can act as a promising candidate for mid-infrared laser seed source.
DOI: 10.57760/sciencedb.04651
title: Analysis of neutral beam proton ratio based on multiple linear regressive model
title: 基于多元线性回归模型的中性束质子比分析研究

description: The levels of neutral beam proton ratio have an important influence on heating the plasma. In the experiment, the macro operation parameters of high current ion source, such as filament voltage, arc voltage and gas flow rate, decide the levels of neutral beam proton ratio. Based on the Experimental Advanced Superconducting Tokamak (EAST) neutral beam injection test bed beam extraction experiments, this paper has used the multiple linear regressive model to analyze extraction neutral beam proton ratio and established the prediction equation which influences neutral beam proton ratio, and tested the correctness of the model. The results show that the neutral beam proton ratio could be analyzed by the multiple linear regressive model whose dependent variables are filament voltage and arc voltage. Among them, the filament voltage is a key parameter to influence proton ratio and then arc voltage.
description: The levels of neutral beam proton ratio have an important influence on heating the plasma. In the experiment, the macro operation parameters of high current ion source, such as filament voltage, arc voltage and gas flow rate, decide the levels of neutral beam proton ratio. Based on the Experimental Advanced Superconducting Tokamak (EAST) neutral beam injection test bed beam extraction experiments, this paper has used the multiple linear regressive model to analyze extraction neutral beam proton ratio and established the prediction equation which influences neutral beam proton ratio, and tested the correctness of the model. The results show that the neutral beam proton ratio could be analyzed by the multiple linear regressive model whose dependent variables are filament voltage and arc voltage. Among them, the filament voltage is a key parameter to influence proton ratio and then arc voltage.
DOI: 10.57760/sciencedb.04656
title: High-Quality Draft Genome Sequence of Pseudomonas songnenensis L103, a Denitrifier Isolated from a 100-Meter- Deep Aquifer in a Heavily Nitrogen-Fertilized Agricultural Area
title: 一株从 100 米深的高氮农业区含水层中分离的反硝化细菌Pseudomonas songnenensis L103的高质量基因组序列草图

description: Pseudomonas songnenensis strain L103 was isolated from a 100-m-deep aquifer in the North China Plain, a heavily nitrogen-fertilized agricultural area. The genome is 4.8 Mb and contains 4,409 protein-coding genes, including a full set of genes (nar, nir, nor, and nos) for complete denitrification.
description: Pseudomonas songnenensis strain L103 was isolated from a 100-m-deep aquifer in the North China Plain, a heavily nitrogen-fertilized agricultural area. The genome is 4.8 Mb and contains 4,409 protein-coding genes, including a full set of genes (nar, nir, nor, and nos) for complete denitrification.
DOI: 10.57760/sciencedb.04654
title: Raw data-Poloidally localized edge density fluctuation with applied and spontaneous 3-D fields in experimental advanced superconducting tokamak (EAST)
title: Raw data-Poloidally localized edge density fluctuation with applied and spontaneous 3-D fields in experimental advanced superconducting tokamak (EAST)

description: Figures for journal paper 'T. Zhang et al, Phys. Plasmas 26, 092504 (2019)'
description: Figures for journal paper 'T. Zhang et al, Phys. Plasmas 26, 092504 (2019)'
DOI: 10.57760/sciencedb.04660
title: Figures-Experimental observation of reverse-sheared Alfven eigenmodes (RSAEs) in ELMy H-mode plasma on the EAST tokamak
title: Figures-Experimental observation of reverse-sheared Alfven eigenmodes (RSAEs) in ELMy H-mode plasma on the EAST tokamak

description: Figures for journal paper 'T Zhangt et al, Plasma Sci. Technol. 20 (2018) 115101'
description: Figures for journal paper 'T Zhangt et al, Plasma Sci. Technol. 20 (2018) 115101'
DOI: 10.57760/sciencedb.04661
title: EAST Tokamak # 69420, # 69421, # 69423 Edge Temperature & Rotation Analysis Data Set
title: EAST托卡马克#69420,#69421,#69423边界温度以及旋转分析数据集

description: The edge temperature and rotation data of # 69420, # 69421 and # 69423 on EAST were diagnosed and analyzed by using the edge-CXRS of EAST, and the physical problems related to L-H conversion were analyzed through the data. The related papers were published in the FST journal.
description: The edge temperature and rotation data of # 69420, # 69421 and # 69423 on EAST were diagnosed and analyzed by using the edge-CXRS of EAST, and the physical problems related to L-H conversion were analyzed through the data. The related papers were published in the FST journal.