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面向聚变堆的托卡马克稳态先进运行模式的发展 预览
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作者 丁斯 钱金平 龚先祖 《自然杂志》 2018年第2期102-107,共6页
人类文明和经济的持续快速发展有赖于新能源的发现和广泛应用。清洁、高效、几乎无尽的核聚变能源可以成为当前化石能源的有效替代,能够成为人类的终极能源。名为托卡马克(Tokamak)的磁约束装置是当前人类用于研究核聚变产生能源的主要... 人类文明和经济的持续快速发展有赖于新能源的发现和广泛应用。清洁、高效、几乎无尽的核聚变能源可以成为当前化石能源的有效替代,能够成为人类的终极能源。名为托卡马克(Tokamak)的磁约束装置是当前人类用于研究核聚变产生能源的主要方式之一。为了提高其运行的安全性和经济性,科学家们设计了多种能够使聚变等离子体长时间稳态运行的先进运行模式。这类运行模式的长足发展依赖于高温等离子体物理和核聚变相关技术等领域的研究进展,尤其是对于自举电流和外部驱动电流的研究。托卡马克稳态先进运行模式将成为未来国际热核聚变实验堆(International Thermonuclear Experimental Reactor,ITER)和中国聚变工程实验堆(China Fusion Engineering Test Reactor,CFETR)主要的运行模式。 展开更多
关键词 磁约束核聚变 托卡马克 稳态先进运行模式
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Kinetic equilibrium reconstruction for the NBI-and ICRH-heated H-mode plasma on EAST tokamak
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作者 郑振 项农 +8 位作者 陈佳乐 丁斯 杜红飞 李国强 王一丰 刘海庆 李颖颖 吕波 臧庆 《等离子体科学与技术:英文版》 SCIE EI CAS CSCD 2018年第6期30-38,共9页
关键词 TOKAMAK 辅助加热 平衡重 血浆 运动 ICRH NBI 东方
The observation of small ELM post-cursor mode in EAST
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作者 赵楠 颜宁 +9 位作者 徐国盛 王正汹 陈冉 汪惠乾 王亮 丁斯 邵林明 陈良 胡广海 张炜 《等离子体科学与技术:英文版》 SCIE EI CAS CSCD 2018年第2期41-46,共6页
关键词 榆树 TOKAMAK 光标 东方 频率调制 试验性 局部性 实验室
Realization of minute-long steady-state H-mode discharges on EAST
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作者 龚先祖 万宝年 +27 位作者 李建刚 钱金平 李二众 刘甫坤 赵燕平 王茂 徐旵东 A M GAROFALO Annika EKEDAH 丁斯 黄娟 张凌 臧庆 刘海庆 曾龙 林士耀 沈飙 张斌 邵林明 肖炳甲 胡建生 胡纯栋 胡立群 王亮 孙有文 徐国盛 梁云峰 项农 《等离子体科学与技术:英文版》 SCIE EI CAS CSCD 2017年第3期1-3,共3页
在 2016 东方试验性的运动,有比一分钟长持续的象ITER一样钨 divertor 的不变的长脉搏的H模式分泌物用仅仅 RF 加热和当前的开车被获得了,通过墙调节的综合控制,血浆配置, divertor 热流动,粒子用尽,杂质管理,并且多重 RF 在高... 在 2016 东方试验性的运动,有比一分钟长持续的象ITER一样钨 divertor 的不变的长脉搏的H模式分泌物用仅仅 RF 加热和当前的开车被获得了,通过墙调节的综合控制,血浆配置, divertor 热流动,粒子用尽,杂质管理,并且多重 RF 在高注射的功率加热和当前的开车来源的有效联合。血浆水流(我 <SUB > p </SUB>?~?0.45 麻省) 充分无感地被驾驶(V <SUB > 环 </SUB>?<?0.0 V ) 由 ~ 的联合 2.5 MW LHW, ~ 0.4 MW ECH 和 ~ 0.8 MW ICRF。这结果表明物理的进步,技术在东方,和愿望利益上学习 ITER 和 CFETR 的稳定的州的操作的物理基础。 展开更多
关键词 稳态运行 H模式放电 等离子体电流 电流驱动 ITER 物理基础 实验活动 脉冲放电
Fishbone Mode Excited by Deeply Trapped Energetic Beam Ions in EAST
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作者 郑婷 吴斌 +10 位作者 徐立清 胡纯栋 臧庆 丁斯 李颖颖 伍兴权 王进芳 沈飙 钟国强 李昊 石同辉 《等离子体科学与技术:英文版》 SCIE EI CAS CSCD 2016年第6期595-600,共6页
This paper describes the fishbone mode phenomena during the injection of highpower neutral beams in EAST(Experimental Advanced Superconducting Tokamak).The features of the fishbone mode are presented.The change in fre... This paper describes the fishbone mode phenomena during the injection of highpower neutral beams in EAST(Experimental Advanced Superconducting Tokamak).The features of the fishbone mode are presented.The change in frequency of the mode during a fishbone burst is from 1 kHz to 6 kHz.The nonlinear behavior of the fishbone mode is analyzed by using a prey-predator model,which is consistent with the experimental results.This model indicates that the periodic oscillations of the fishbone mode always occur near the critical value of fast ion beta.Furthermore,the neutral beam analysis for the discharge is done by using the NUBEAM module of the TRANSP code.According to the numerical simulation results and theoretical calculation,it can be concluded that the fishbone mode is driven by the deeply trapped energetic beam ions in EAST. 展开更多
关键词 束离子 鱼骨 骨模 能量 超导托卡马克装置 中性束注入 激发 模型分析
Numerical study of fast ion behavior in the presence of magnetic islands and toroidal field ripple in the EAST tokamak 被引量:1
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作者 张伟 胡立群 +3 位作者 孙有文 丁斯 张子君 刘松林 《中国物理B:英文版》 SCIE EI CAS CSCD 2014年第10期334-341,共8页
A peculiar first orbit loss type was found apart from the normal ones when we use ORBIT code to simulate fast ion orbits in the EAST tokamak. Fast ion orbits were studied in the presence of toroidal field(TF) ripple a... A peculiar first orbit loss type was found apart from the normal ones when we use ORBIT code to simulate fast ion orbits in the EAST tokamak. Fast ion orbits were studied in the presence of toroidal field(TF) ripple and magnetohydrodynamic(MHD) perturbations. We analyzed the properties of the drifted orbits in detail and compared their differences,finding that the combined effects of ripple and magnetic islands are much greater than the effects of either one of them alone. Then we investigated the orbit deviations as a function of pitch angle in different radial positions. The modeling results demonstrate that the loss of trapped particles is mainly caused by the ripple, while MHD perturbation mainly plays an important role in the passing particles. Furthermore we modeled the loss rate using different equilibriums. Results prove that a higher beta can indeed improve the confinement of fast ions, while a little change in the q profile can make the topologies of magnetic islands become quite different and results in quite different total particle losses. 展开更多
关键词 托卡马克 EAST 快离子 数值研究 波纹 磁岛 环向场 行为
Observation of Electron Energy Pinch in HT-7 ICRF Heated Plasmas
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作者 丁斯 万宝年 +6 位作者 王璐 提昂 张新军 刘子奚 钱金平 钟国强 段艳敏 《等离子体科学与技术:英文版》 SCIE EI CAS CSCD 2014年第9期826-832,共7页
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 T... 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. 展开更多
关键词 热等离子体 电子能量 HT-7 ICRF 能源运输 回旋共振频率 实验条件 对流速度
中性束注入在EAST中激发的离散阿尔文不稳定性 被引量:1
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作者 王军 胡纯栋 +3 位作者 胡双辉 吴斌 丁斯 王进芳 《物理学报》 SCIE EI CAS CSCD 北大核心 2013年第3期204-209,共6页
中性束加热将应用于先进实验超导托卡马克装置中,在改善等离子性能的同时也会激发起多种阿尔文不稳定性.本文主要采用了数值模拟的方法在理论上研究了中性束注入时在台基区激发的离散阿尔文本征模(αTAE)和环效应阿尔文本征模(TAE)... 中性束加热将应用于先进实验超导托卡马克装置中,在改善等离子性能的同时也会激发起多种阿尔文不稳定性.本文主要采用了数值模拟的方法在理论上研究了中性束注入时在台基区激发的离散阿尔文本征模(αTAE)和环效应阿尔文本征模(TAE),结果表明在这个区域会激发出丰富的离散阿尔文不稳定性,这种离散阿尔文不稳定性不同于传统的TAE,这种模式是俘获在气球模驱动势阱中的束缚态,由于气球模势阱的存在使它和连续谱解耦,从势阱中漏出去的能量可以忽略不计,和TAE类似都很容易被激发,这种模式可以存在于gap内,也可以存在于gap外,频谱更宽泛.注入功率越大这种不稳定性增长率越大.这种不稳定性可能会影响等离子体的物理行为,从而影响等离子体的约束. 展开更多
关键词 中性束 阿尔文波 高能量粒子
Alfvén Instabilities Excited by Energetic Particles in a Parameter Regime Similar to EAST Operation
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作者 王军 胡纯栋 +2 位作者 胡双辉 吴斌 丁斯 《等离子体科学和技术:英文版》 SCIE EI CAS CSCD 2013年第8期750-754,共5页
The kinetic excitation of ideal magnetohydrodynamic (MHD) Alfvén instabilities is investigated for operations at the EAST tokamak. The instabilities include α-induced toroidal Alfvén eigenmodes (αTAE; her... The kinetic excitation of ideal magnetohydrodynamic (MHD) Alfvén instabilities is investigated for operations at the EAST tokamak. The instabilities include α-induced toroidal Alfvén eigenmodes (αTAE; here, α =-q2 Rdβ/dr, with q being the safety factor, β the ratio between the plasma and magnetic pressures, R the major radius, and r the minor radius), toroidicity-induced Alfvén eigenmodes (TAE), and the energetic particle continuum mode (EPM). The αTAE, trapped by α-induced potential wells along the magnetic field line, can be readily destabilized by energetic particles due to negligible continuum damping via wave energy tunneling. It is shown for the geometry and the parameters similar to those of the EAST equilibrium that αTAE is different not only from the EPM by the potential-well determined frequency, but also from the TAE by the broad frequency spectrum outside the toroidal frequency gap. 展开更多
关键词 不稳定性 高能粒子 激发 操作 相似 政权 EAST装置 安全系数
Neutron Yields Based on Transport Calculation in EAST ICRF Minority Heating Plasmas
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作者 李晓玲 万宝年 +6 位作者 郭智荣 钟国强 胡立群 林士耀 张新军 丁斯 吕波 《等离子体科学和技术:英文版》 SCIE EI CAS CSCD 2013年第5期411-416,共6页
Neutron diagnostics, including flux and energy spectrum measurements, have been applied on the experimental advanced superconducting tokamak (EAST). The absolute calibration of neutron yields has been achieved by a ca... Neutron diagnostics, including flux and energy spectrum measurements, have been applied on the experimental advanced superconducting tokamak (EAST). The absolute calibration of neutron yields has been achieved by a calculation method using the Monte Carlo automatic modeling (MCAM) system and the Monte Carlo N-Particles (MCNP) code. Since the neutron yield is closely related with the ion density and temperature, it is a good measure of plasma performance, especially the wave heating effect. In ion cyclotron range of frequencies (ICRF) experiments, the increase in the ion temperature derived by the neutron yield indicates an effective plasma heating. Minority protons damp a large fraction of the total wave power, and then transfer part of the energy to deuterium by collisions. Neutron spectrum measurements also indicate that no tail is created by high energy deuterons during ICRF heating. However, the ion temperature derived by the neutron yield is consistent with the result by using a poloidal X-ray imaging crystal spectrometer (PXCS), showing a reliable transport calculation. 展开更多
关键词 等离子体性能 中子产额 ICRF 计算 中子能谱测量 暖气 运输 超导托卡马克
Reciprocating Probe Measurements of L-H Transition in LHCD H-Mode on EAST 被引量:1
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作者 刘鹏 徐国盛 +6 位作者 汪惠乾 蒋敏 王亮 张炜 刘少承 颜宁 丁斯 《等离子体科学和技术:英文版》 SCIE EI CAS CSCD 2013年第7期619-622,共4页
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-... 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 n e and electron temperature T e 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 P loss was comparable during the L-H transition, by comparing the adjacent L-mode and H-mode discharge. The Dα emission, T e and n e decreased rapidly in the time scale of about 1 ms, and the radial electric field E r 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 Dα signal, and E r 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. 展开更多
关键词 低杂波电流驱动 H模式放电 LHCD 朗缪尔探针 EAST 国际热核实验堆 测量 加热功率
Simulations of Neutral Beam Ion Ripple Loss on EAST 被引量:1
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作者 李吉波 丁斯 +1 位作者 吴斌 胡纯栋 《等离子体科学和技术:英文版》 SCIE EI CAS CSCD 2012年第1期 78-82,共5页
Predictions on the ripple loss of neutral beam fast ions on EAST are investigated with a guiding center code, including both ripple and collisional effects. A 6% to 16% loss of neutral beam ions is predicted for typic... Predictions on the ripple loss of neutral beam fast ions on EAST are investigated with a guiding center code, including both ripple and collisional effects. A 6% to 16% loss of neutral beam ions is predicted for typical EAST experiments, and a synergistic enhancement of fast ion loss is found for toroidal field (TF) ripples with collisions. The lost ions are strongly localized and will cause a maximum heat load of ~ 0.05 MW/m 2 on the first wall. 展开更多
关键词 中性束注入 损失预测 离子波纹 数值模拟 华东 束离子 快离子 本地化
相干结构Blob在HT-7托卡马克边界的传播 预览
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作者 颜宁 张炜 +2 位作者 常加峰 明廷凤 丁斯 《强激光与粒子束》 EI CAS CSCD 北大核心 2011年第10期 2640-2644,共5页
相干结构Blob的间歇爆发清晰地反映在HT-7托卡马克边界探针的离子饱和流信号中,Blob的径向传播在近刮削层堆积出一个温度和密度的平台区,使密度和温度分布偏离了指数分布。条件平均方法提示了间歇脉冲结构空间分布的均匀性,Blob内部等... 相干结构Blob的间歇爆发清晰地反映在HT-7托卡马克边界探针的离子饱和流信号中,Blob的径向传播在近刮削层堆积出一个温度和密度的平台区,使密度和温度分布偏离了指数分布。条件平均方法提示了间歇脉冲结构空间分布的均匀性,Blob内部等离子体参数远高于背景等离子体参数,并且呈现出涡旋的形态。最后闭合磁面附近的数据显示,Blob的间歇爆发导致了边界约50%的粒子输运和能量输运。实验结果表明:相干结构在剪切层受到了扭曲,在刮削层区域沿离子的逆磁漂移方向传播。 展开更多
关键词 间歇爆发 相干结构 漂移速度 Blob空间尺度 去相关 剪切层
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EAST中性束注入快离子损失研究 预览
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作者 李吉波 丁斯 +2 位作者 王进芳 吴斌 胡纯栋 《核聚变与等离子体物理》 CAS CSCD 北大核心 2011年第3期 213-218,共6页
利用经典导心轨道程序ORBIT,结合平衡程序EFIT和输运程序TRANSP,计算了EAST中性束注入后快离子的损失情况。结果表明,4MW(80keV)氘离子的损失份额为29%,2MW(50keV)氘离子的损失份额为31%,损失的快离子有很强的局域性。
关键词 中性束注入 快离子损失 导心轨道程序
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A Dip Structure in the Intrinsic Toroidal Rotation Near the Edge of the Ohmic Plasmas in EAST
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作者 徐国盛 V. NAULIN +20 位作者 万宝年 郭后扬 张炜 常加峰 颜宁 丁斯 张凌 王亮 刘少承 刘鹏 蒋敏 汪惠乾 J. Juul RASMUSSEN A. H. NIELSEN 肖持进 高翔 胡立群 朱思铮 吴振伟 钱金平 龚先祖 《等离子体科学和技术:英文版》 SCIE EI CAS CSCD 2011年第4期397-404,共8页
<正> Ion’s toroidal velocity,v_t,in both the outermost 4 cm of the confined region and thescrap-off layer of Ohmic L-mode plasmas in EAST was measured using Mach probes.At about1 cm inside the separatrix a loca... <正> Ion’s toroidal velocity,v_t,in both the outermost 4 cm of the confined region and thescrap-off layer of Ohmic L-mode plasmas in EAST was measured using Mach probes.At about1 cm inside the separatrix a local minimum in v_t was observed,from which a cocurrent rotationincreased both inwards and outwards.The radial width of the v_t dip was 1 cm to 2 cm,andboth 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 toroidaltorques induced by neutral friction,neoclassical viscosity,collisional perpendicular shear viscosity,ion orbit loss and turbulent Reynolds stress were estimated using the measured parameters.Ourresults indicate that in this particular parameter regime the neutral friction was the dominantdamping force.The calculated cocurrent toroidal torque by the neoclassical viscosity dominatesover those from the collisional perpendicular shear viscosity,ion orbit loss and turbulent Reynoldsstress.These results are potentially important for the understanding of boundary conditions forthe intrinsic toroidal momentum in tokamak plasmas. 展开更多
关键词 等离子体边缘 环形 IP结构 旋转 欧姆 托卡马克等离子体 新古典主义 剪切粘度
Observation of Blobs and Holes in the Boundary Plasma of EAST Tokamak
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作者 颜宁 徐国盛 +13 位作者 张炜 常加峰 王亮 刘少承 刘鹏 汪惠乾 蒋敏 熊豪 丁斯 万宝年 高翔 V. NAULIN A. H. NIELSEN J. Juul RASMUSSEN 《等离子体科学和技术:英文版》 SCIE EI CAS CSCD 2011年第4期410-414,共5页
<正> Intermittent convective transport at the edge and in the scrape-off layer(SOL)ofEAST was investigated by using fast reciprocating Langmuir probe.Holes,as part of plasmastrTictures,were detected for the firs... <正> Intermittent convective transport at the edge and in the scrape-off layer(SOL)ofEAST was investigated by using fast reciprocating Langmuir probe.Holes,as part of plasmastrTictures,were detected for the first time inside the shear layer.The amplitude probabilitydistribution function of the turbulence is strongly skewed,with positive skewed events("blobs")prevailing in the SOL region and negative skewed events("holes")dominant inside the shearlayer.The statistical properties coincide with previous observations from JET.The generationmechanism of blobs and holes is also discussed.In addition burst structure and dynamics characterof them are also presented. 展开更多
关键词 等离子体 BLOB 托卡马克 边界 概率分布函数 朗缪尔探针 对流运输 统计特性
Estimation of Neutral Density in Edge Plasma with Double Null Configuration in EAST
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作者 张凌 徐国盛 +10 位作者 丁斯 高伟 吴振伟 陈颖杰 黄娟 刘晓菊 臧庆 常加峰 张炜 李颖颖 钱金平 《等离子体科学和技术:英文版》 SCIE EI CAS CSCD 2011年第4期431-434,共4页
<正> In this work,population coefficients of hydrogen’s n=3 excited state from thehydrogen collisional-radiative(CR)model,from the data file of DEGAS 2,are used to calculatethe photon emissivity coefficients... <正> In this work,population coefficients of hydrogen’s n=3 excited state from thehydrogen collisional-radiative(CR)model,from the data file of DEGAS 2,are used to calculatethe photon emissivity coefficients(PECs)of hydrogen Balmer-α(n=3 → n=2)(Hα).Theresults are compared with the PECs from Atomic Data and Analysis Structure(ADAS)database,and a good agreement is found.A magnetic surface-averaged neutral density profile of typicaldouble-null(DN)plasma in EAST is obtained by using FRANTIC,the 1.5-D fluid transportcode.It is found that the sum of integral Dα and Hα emission intensity calculated via theneutral density agrees with the measured results obtained by using the absolutely calibratedmulti-channel poloidal photodiode array systems viewing the lower divertor at the last closed fluxsurface(LCFS).It is revealed that the typical magnetic surface-averaged neutral density at LCFSis about 3.5×1016m-3. 展开更多
关键词 边缘等离子体 密度估计 中性 结构分析系统 光电二极管阵列 配置 密度计算 数据文件
Study of Scrape-Off-Layer Width in Ohmic and Lower Hybrid Wave Heated Double-Null Divertor Plasma in EAST
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作者 王亮 徐国盛 +16 位作者 常加峰 张炜 颜宁 丁斯 刘少承 明廷凤 汪惠乾 刘鹏 蒋敏 熊豪 万宝年 高翔 郭后扬 胡立群 吴振伟 朱思铮 罗广南 《等离子体科学和技术:英文版》 SCIE EI CAS CSCD 2011年第4期435-439,共5页
<正> Edge profiles in Ohmic and lower hybrid(LH)wave heated discharges in EASTare presented.A comparison of the measured profiles is made with those from the theoreticalprediction for the scrape-off-layer(SOL)wi... <正> Edge profiles in Ohmic and lower hybrid(LH)wave heated discharges in EASTare presented.A comparison of the measured profiles is made with those from the theoreticalprediction for the scrape-off-layer(SOL)width.The edge plasma parameters are diagnosed bya triple probe divertor diagnostic system and fast reciprocating probes at the outer mid-plane.The experimental results show that the SOL width of double-null(DN)divertor plasmas in EASTappears to exhibit a negative dependence on the power crossing the separatrix,which is consistentwith the collisional SOL scalings of JET and Alcator C-Mod.This will provide useful informationfor extrapolation to the ITER SOL width scaling for power deposition. 展开更多
关键词 等离子体参数 偏滤器 波加热 宽度 电阻 国际热核实验堆 混杂 关闭
Intermittent Bursts in the Boundary Plasma of HT-7
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作者 颜宁 徐国盛 +5 位作者 张炜 常加峰 明廷凤 丁斯 章文扬 韩效锋 《等离子体科学和技术:英文版》 SCIE EI CAS CSCD 2010年第4期401-407,共7页
<正> Intermittent characteristics of turbulence induced by coherent structures (blobs)was clearly observed in the ion saturation current signal, density fluctuation, particle flux andheat flux in HT-7. It is obv... <正> Intermittent characteristics of turbulence induced by coherent structures (blobs)was clearly observed in the ion saturation current signal, density fluctuation, particle flux andheat flux in HT-7. It is obvious that ion saturation current signal has deviated from Gaussiandistribution and the skewness (S) and flatness (K) of signal increase radially outwards in thescrape-off layer (SOL). Using conditional analysis (CA), asymmetric character of the intermittentbursts are demonstrated. Owing to the radial propagation of the coherent structures, the particledensity profile in SOL is non-exponential and flat outwards from the last close flux surface (LCFS).It is found around LCFS that the large burst fluctuations (above 2.5 rms) are responsible for about50% of the total particle transport. Burst events move radially outwards with E_θ× B velocity, andthe blob size can be calculated as δΥ~V_rΤ_c. Our experiment shows that the blob size, life time anddrift velocity experienced a pronounced decorrelation in the shear layer. The electrostatic Reynoldsstress components become very strong and show a radially steep gradient in the proximity of theshear layer. These experimental findings may imply that the coherent structures are titled by thedeveloped shear flow in the E× B shear layer. 展开更多
关键词 等离子体边界 间歇性 爆发 电流信号 相干结构 BLOB 粒子通量 对称特征
Structural Evolution of SiC Films During Plasma-Assisted Chemical Vapour Deposition
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作者 丁斯 颜官超 +1 位作者 朱晓东 周海洋 《等离子体科学和技术:英文版》 SCIE EI CAS CSCD 2009年第2期159-162,共4页
<正> Evolution of chemical bonding configurations for the films deposited from hexam-ethyldisiloxane(HMDSO)diluted with H_2 during plasma assisted chemical vapour deposition isinvestigated.In the experiment a sm... <正> Evolution of chemical bonding configurations for the films deposited from hexam-ethyldisiloxane(HMDSO)diluted with H_2 during plasma assisted chemical vapour deposition isinvestigated.In the experiment a small amount of CH_4 was added to adjust the plasma environ-ment and modify the structure of the deposited Alms.The measurements of Raman spectroscopyand X-ray diffraction(XRD)revealed the production of 6H-SiC embedded in the amorphous ma-trix without the input of CH_4.As CH_4 was introduced into the deposition reaction,the transitionof 6H-SiC to cubic SiC in the films took place,and also the film surfaces changed from a struc-ture of ellipsoids to cauliflower-like shapes.With a further increase of CH_4 in the flow ratio,theobtained films varied from Si-C bonding dominant to a sp~2/sp~3 carbon-rich composition. 展开更多
关键词 等离子体辅助化学气相沉积 SIC薄膜 构造演化 碳化硅薄膜 等离子体环境 表面结构 拉曼光谱 射线衍射
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