Intermittent Bursts in the Boundary Plasma of HT-7

来源 :Plasma Science and Technology | 被引量 : 0次 | 上传用户:dvdwen
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
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. Intermittent characteristics of turbulence induced by coherent structures (blobs) were clearly observed in the ion saturation current signal, density fluctuation, particle flux and heat flux in HT-7. It is obvious that ion saturation current signal has deviated from Gaussia distribution and the skewness (S ) and flatness (K) of signal increase radially outwards in the scrape-off layer (SOL). Using conditional analysis (CA), asymmetric character of the intermittentbursts are demonstrated. 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 about 50% of the total particle transport. Burst events move radially outwards with E_θ × B velocity, and the blob size can be calculated as δΥ ~ V_rT_c. Our experiment shows that the blob size, life time and driver velocity experienced a pronoun The experimental Reynoldsstress components become very strong and show a radial steep gradient in the proximity of the shear layer. The experimental co-contracted structures are titled by thedeveloped shear flow in the E × B shear layer.
其他文献
目的 建立工作场所空气中丁酸和异丁酸的气相色谱测定法.方法 以硅胶管采集工作场所中的丁酸和异丁酸,用丙酮解吸,经毛细管色谱柱分离,以火焰离子化检测器检测.结果 丁酸和异
目的 人群活动模式是空气污染物健康风险评估中的重要基础参数,并被认为是暴露评估误差的最主要来源之一.目前,除美国外,各国对人群活动模式的研究起步相对较晚,该研究仍处于
随着经济社会的不断发展,社会竞争压力不断加大,对学生的心理健康也产生了一定影响,从而对学生心理健康教育提出了新的要求.在新课程教育改革的背景下,强化学生心理健康教育
比赛教学法是一种非常有效的教学方式,对于提高和巩固学生的篮球技术有重要作用,本文通过分析比赛教学法的概念,并结合实际情况,进一步探讨了比赛教学法在大学篮球教学中的意
目的 探讨900 MHz频率电磁辐射对大鼠睾丸氧化损伤以及Prdx4蛋白表达的影响,并探讨龟龄集对其作用机制.方法 将50只健康清洁级雄性SD大鼠随机分为正常对照组和辐射4、8h组及
第二节书面表达Dear Peter,I’d like to ask you to write an article for our school’s English newspaper.Our school’s English newspaper started a new part named“
Implementation of a web-based logbook system on EAST is introduced, which canstore the comments for the experiments into a database and access the documents vi
目的 探讨西南某煤矿区土壤重金属污染特征及人群健康风险.方法 于2014年4-8月采集西南某煤矿区土壤,测定其重金属元素Pb、Cd、Hg、As、Cu的含量.采用潜在生态风险指数法、地
目的 研究纳米二氧化钛染毒对小鼠卵巢组织中甾醇O-酰基转移酶1 (SOAT1)与类固醇合成急性调节蛋白(STAR)表达的影响.方法 将48只40日龄清洁级ICR雌性小鼠随机分为4组,分别为
经济全球化的全面推进,使得我国对高素质、国际化的各类人才的需求不断增加,培养更多的具有国际化视野的管理人才和技术人才,已经成为社会的迫切需要,高职院校通过中外合作办