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国家自然科学基金(10990212)

作品数:13 被引量:5H指数:1
相关作者:沈永才符佳吕波石跃江李颖颖更多>>
相关机构:中国科学院等离子体物理研究所中国科学技术大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划中国博士后科学基金更多>>
相关领域:核科学技术理学机械工程自动化与计算机技术更多>>

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13 条 记 录,以下是 1-10
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Observation of Electron Energy Pinch in HT-7 ICRF Heated Plasmas
2014年
Inward energy transport (pinch phenomenon) in the electron channel is observed in HT-7 plasmas using off-axis ion cyclotron resonance frequency (ICRF) heating. Experimental results and power balance transport analysis by TRANSP code are presented in this article. With the aids of GLF23 and Chang-Hinton transport models, which predict energy diffusivity in experimental conditions, the estimated electron pinch velocity is obtained by experimental data and is found reasonably comparable to the results in the previous study, such as Song on Tore Supra. Density scanning shows that the energy convective velocity in the electron channel has a close relation to density scale length~ which is qualitatively in agreement with Wang's theoretical prediction. The parametric dependence of electron energy convective velocity on plasma current is still ambiguous and is worthy of future research on EAST.
丁斯晔万宝年王璐提昂张新军刘子奚钱金平钟国强段艳敏
EAST装置锂化壁下低杂波等离子体温度行为研究
2012年
在EAST全超导托卡马克归一化半径r/α≤0.6区域内部,在高功率低混杂波电流驱动辅助加热下,以及第一壁锂化处理条件下,在低混杂波注入中期观测到电子温度剖面和离子温度剖面变平的现象.利用X射线弯曲晶体光谱仪诊断系统,并结合其他相关诊断系统研究了在第一壁锂化条件下,以及EAST低杂波放电位形下,电子温度剖面和离子温度的剖面行为.研究结果表明:电子温度剖面和离子温度剖面变平的现象是由于第一壁锂化处理技术对从等离子体边界流向第一壁的粒子流产生了影响,使得边界粒子再循环模式受到抑制,这种低再循环模式的存在引起了温度剖面的变化.同时观察到离子温度和电子温度彼此接近的现象,这是由于随着等离子体密度的增加,电子与离子之间的碰撞行为加剧所产生的结果.
徐经翠王福地吕波沈永才李颖颖符佳石跃江Sanggon LeeM.BitterK.Hill
关键词:温度剖面
Spectroscopic Measurements of Impurity Spectra on the EAST Tokamak被引量:1
2012年
Ultraviolet (UV) and visible impurity spectra (200-750 nm) are commonly used to study plasma and wall interactions in magnetic fusion plasmas. Two optical multi-channel analysis (OMA) systems have been installed for the UV-visible spectrum measurement on EAST. These two OMA systems are both equipped with the Czerny-Turner (C-T) type spectrometer. The upper vacuum vessel and inner divertor baffle can be viewed simultaneously through two optical lenses. The OMA1 system is mainly used for multi-impurity lines radiation measurement. A 280 nm wavelength range can be covered by a 300 mm focal length spectrometer equipped with a 300 grooves/mm grating. The Da/Ha line shapes can be resolved by the OMA2 system. The focal length is 750 mm. The spectral resolution can be up to 0.01 nm using a 1800 grooves/mm grating. The impurity behaviour and hydrogen ratio evolution after boroniztion, lithium coating, and siliconization are compared. Lithium coating has shown beneficial effects on the reduction of edge recycling and low Z impurity (C, O) influx. The impurity expelling effect of the divertor configuration is also briefly discussed through multi-channels observation of OMA1 system.
FU JiaLI YingyingSHI YuejiangWANG FudiZHANG WeiLV BoHUANG JuanWAN BaonianZHOU Qian
关键词:BORONIZATIONTOKAMAK
EAST软X射线光谱仪绝对强度标定被引量:2
2013年
采用基于等离子体轫致辐射的方法,完成了EAST软X射线光谱仪的绝对强度标定。首先利用软X射线光谱仪测量了EAST等离子体的轫致辐射的强度,然后基于等离子体电子温度、电子密度、有效电荷数的剖面,计算了等离子体轫致辐射的功率密度剖面。并将其沿软X射线光谱仪的观测弦进行积分,得到了弦积分的轫致辐射强度。最后通过将轫致辐射强度的测量值和计算值进行对比,得到了软X射线光谱仪在10~50范围内的绝对强度标定系数。通过比较不同放电条件下的绝对强度标定系数,发现实验中标定系数变化不大,相对稳定。然后利用标定过的软X射线光谱仪测量CⅥ33.73谱线的辐射强度,并通过非圆截面反演,初步获得了CⅥ33.73绝对辐射强度的径向分布剖面。研究表明,利用轫致辐射对软X射线光谱仪的标定是可行可靠的。获得的杂质辐射绝对强度可结合杂质输运程序进行杂质输运研究。
张洪明沈永才符佳李颖颖熊言威王福地吕波吴振伟石跃江万宝年
关键词:轫致辐射
Reciprocating Probe Measurements of L-H Transition in LHCD H-Mode on EAST被引量:1
2013年
As the power available in the initial phase of the ITER operation will be limited, accessing the high confinement mode (H-mode) with low heating power will be a critical issue. In the recent experiment on EAST, the H-mode was obtained for the first time with lower hybrid current drive (LHCD) wave only. Reciprocating Langmuir probe measurements at the outer midplane showed that the electron density ne and electron tempel:ature Te in the scrape-off layer (SOL) were significantly reduced in the ELM-free phase, resulting in the increase of lower-hybrid wave (LHW) reflection. It was found that the power loss Ploss was comparable during the L-H transition, by comparing the adjacent L-mode and H-mode discharge. The Da emission, Te and ne decreased rapidly in the time scale of about 1 ms, and the radial electric field Er turned positive in this process near the last closed flux surface. Multiple L-H-L transitions were observed during a single shot when the applied LHW power was marginal to the threshold. The floating potential (Vf) had negative spikes corresponding with the Da signal, and Er oscillation evolved into several intermittent negative spikes just before the L-H transition. In some shots, dithering was observed just before the L-H transition.
刘鹏徐国盛汪惠乾蒋敏王亮张炜刘少承颜宁丁斯晔
EAST边界旋转诊断的光路分析
2013年
具有空间和时间分辨的边界旋转诊断(ERD)已在EAST装置上研制完成,经调试已投入EAST实验研究中。多道光纤的观测视线已进行位置标定,经过分析,每道光纤所能耦合的离子辐射通量可表述为解析形式的弦积分量。使用卤素气体标准灯对光谱仪进行了波长标定,并确定了仪器响应函数。ERD可提供边界离子温度和旋转速度,是研究C、O、Li、N、He、Ar等离子在可见光波段辐射的有效工具。通过对CIII谱线的分析,得到了边界离子温度和边界旋转速度的初步实验结果,环向ERD初步实验结果表明ERD测量边界杂质离子温度及旋转速度的可行性。
熊言威李颖颖张洪明符佳沈永才王福地石跃江吕波
关键词:离子温度
The Coupling Structure Features Between (2,1) NTM and (1,1) Internal Mode in EAST Tokamak
2015年
In the discharge of EAST tokamak, it is observed that (2, 1) neoclassical tearing mode (NTM) is triggered by mode coupling with a (1, 1) internal mode. Using singular value decomposition (SVD) method for soft X-ray emission and for electron cyclotron emission (ECE), the coupling spatial structures and coupling process between these two modes are analyzed in detail. The results of SVD for ECE reveal that the phase difference between these two modes equals to zero. This is consistent with the perfect coupling condition. Finally, performing statistical analysis of r1/1, ξ1/1 and w2/1, we find that r1/1 more accurately represents the coupling strength than ξ1/1, and r1/1 is also strongly related to the (2, 1) NTM triggering, where r1/1 is the width of (1, 1) internal mode, ξ1/1 is the perturbed amplitude of (1, 1) internal mode, and w2/1 denotes the magnetic island width of (2, 1) NTM.
石同辉万宝年孙有文沈飚钱金平胡立群陈开云刘永
关键词:EASTNTMSVDECE
Properties of Density Fluctuations Induced by Geodesic Acoustic Mode in the Edge of HT-7 Tokamak
2010年
Properties of the geodesic acoustic mode (GAM) density fluctuations are studied using two toroidally separated Langnmir triple-probe arrays on the top of HT-7 tokamak. The GAM scenario is identified in the potential fluctuations with the toroidally symmetric structure (n =0) and satisfying the temperature scaling of GAM mode frequency. Some theoretical predictions about the mode features of GAM density fluctuations are verified in our experiments: the toroidal mode number of GAM density fluctuations is n = 0; its amplitude is consistent with the theoretical prediction in a factor of 2; the density and potential fluctuations of GAM is in anti-phase at the top of plasma cross-section. Strong nonlinear interactions are found between GAM density fluctuations and ambient turbulence (AT). The results support the conclusions that the envelope modulation of potential fluctuations is dominantly caused by the direct regulation of GAM in the generation processing, and the envelope modulation of density fluctuation is due to the GAM shear effect.
赵海林兰涛刘阿娣孔德峰谢锦林刘万东俞昌旋张炜常加峰万宝年李建刚
Spectroscopic Measurement of Neutral Particle Influx Ratio on EAST
2013年
The spectra of HeI(587.6 nm),Hα(656.28 nm) and Dα(656.1 nm) of the helium discharges as well as the normal deuterium discharges have been measured with two optical spectroscopic multi-channel analysis(OMA) systems on the experimental advanced superconducting tokamak(EAST).The influx ratio of the sum of H and D to He spectral lines and the influx ratio of H to D are given.In this way the ratio of hydrogen/deuterium ion(S/X B)H/D to(S/X B)He as well as(S/X B)H/D is not very sensitive to the variation in the edge density and temperature. The low-density helium discharges are operated in order to reduce the recycling hydrogen fluxes; however,the effect is not obvious.The possible reason is that the number of helium discharges is not enough and the content of hydrogen in the wall is still very abundant,which is caused by frequent wall conditionings and the vacuum leakage.The H/(H+D) ratio decreases quickly after one lithium coating and reduces to less than 10%using several accumulated lithium wall conditioning.It is found that the deposited He atoms on the carbon wall will remain at a low level after several D2 discharges.
李颖颖符佳石跃江张伟沈永才王福地吕波黄娟张凌徐经翠周倩
关键词:INFLUX
A Dip Structure in the Intrinsic Toroidal Rotation Near the Edge of the Ohmic Plasmas in EAST
2011年
Ion's toroidal velocity, vt, in both the outermost 4 cm of the confined region and the scrap-off layer of Ohmic L-mode plasmas in EAST was measured using Mach probes. At about 1 cm inside the separatrix a local minimum in vt was observed, from which a cocurrent rotation increased both inwards and outwards. The radial width of the vt dip was 1 cm to 2 cm, and both the density and electron temperature profiles exhibited steep gradients at this dip position. It was observed in both divertor and limiter configurations. To find out its origin, the toroidal torques induced by neutral friction, neoclassical viscosity, collisional perpendicular shear viscosity, ion orbit loss and turbulent Reynolds stress were estimated using the measured parameters. Our results indicate that in this particular parameter regime the neutral friction was the dominant damping force. The calculated cocurrent toroidal torque by the neoclassical viscosity dominates over those from the collisional perpendicular shear viscosity, ion orbit loss and turbulent Reynolds stress. These results are potentially important for the understanding of boundary conditions for the intrinsic toroidal momentum in tokamak plasmas.
徐国盛V.NAULIN万宝年郭后扬张炜常加峰颜宁丁斯晔张凌王亮刘少承刘鹏蒋敏汪惠乾J.Juul RASMUSSENA.H.NIELSEN肖持进高翔胡立群朱思铮吴振伟钱金平龚先祖
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