...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Plasma physics and controlled fusion >Application of 2D tomographic imaging techniques to edge turbulence in RFX-mod
【24h】

Application of 2D tomographic imaging techniques to edge turbulence in RFX-mod

机译：二维层析成像技术在RFX-mod中的边缘湍流中的应用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In the reversed field pinch experiment RFX-mod a gas puffing imaging diagnostic is used to investigate the turbulence of the edge plasma. The system consists of a gas puffing nozzle and 32 optical channels to measure the He-I (668 nm) line emission. The lines of sight are arranged into three fans intersecting each other in an area normal to the main magnetic field. The diagnostic system provides an analogue bandwidth of 2 MHz and all channels are simultaneously sampled at 10 Msamples s(-1) for the whole discharge duration (350 ms). Different inversion techniques have been applied to the data in order to obtain a 2D tomographic reconstruction of the light emission pattern from the line integrals. Comparison shows that the most precise method is based on the 2D spatial Fourier expansion, applying the singular value decomposition technique with a suitable regularization method to avoid artefacts. The high time resolution allows one to obtain a 2D image every 100 ns. Emission structures ('blobs') that move along the E x B flow emerge from the background turbulence and they are characterized by computing energy and phase of the Fourier modes.
机译：在反向场收缩实验RFX-mod中，使用吹气成像诊断程序来研究边缘等离子体的湍流。该系统由一个充气喷嘴和32个光学通道组成，用于测量He-I（668 nm）线发射。视线排列成三个风扇，在垂直于主磁场的区域中相互交叉。该诊断系统提供2 MHz的模拟带宽，并且在整个放电持续时间（350 ms）中，所有通道均以10 Msamples s（-1）同时采样。不同的反演技术已应用于数据，以便从线积分获得发光图案的2D层析成像重建。比较表明，最精确的方法是基于2D空间傅立叶展开，将奇异值分解技术与适当的正则化方法一起使用以避免伪像。高时间分辨率允许每100 ns获得2D图像。沿E x B流移动的发射结构（“气泡”）从背景湍流中出现，其特征在于计算傅立叶模式的能量和相位。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号