Design of the Synthetic Aperture Microwave Imager Upgrade for measurement of the edge current density on MAST-U
Design of the Synthetic Aperture Microwave Imager Upgrade for measurement of the edge current density on MAST-U
复制标题
用于 MAST-U 边缘电流密度测量的合成孔径微波成像仪升级版设计
DOI：
10.1051/epjconf/201920303004
复制
发表时间：
2019
影响因子：
--
通讯作者：
Allen J
中科院分区：
文献类型：
--
作者：
Allen J
合成孔径微波成像仪(SAMI)已经证明了二维多普勒背向散射法测量桅杆和NSTX-U的边缘磁俯仰角的可行性。SAMI-Upgrade(SAMI-U)的目标是在此方法的基础上，在多个空间位置同时产生更高质量的俯仰角数据，从而能够计算边缘电流密度。这种从原则证明到产品质量的转变需要对设计进行几次修改。天线的数量将增加四倍，因为最小化旁瓣电平是确保重建的多普勒背向散射功率图的最大分辨率的关键。SAMI-U将主动探测同时具有两个频率的等离子体。这对应于边缘等离子体中的两个不同的后向散射位置，允许根据测量的磁场矢量计算边缘电流密度。阵列中将使用双极化正弦天线，因为它们是平面和宽带的。为了区分O-模和X-模截止面，偏振分离是必要的，因为它们的位置可以相隔几厘米。由于空间限制，许多组件将被放置在每个天线后面的印刷电路板上。−将用于将超过16 GB的高数据吞吐量S FGA 1流入PC内存。
The Synthetic Aperture Microwave Imager (SAMI) has demonstrated the feasibility of 2D Doppler backscattering for measurement of the edge magnetic pitch angle on MAST and NSTX-U. The aim of SAMI-Upgrade (SAMI-U) is to build on this methodology to produce higher quality pitch angle data simultaneously in multiple spatial locations, enabling calculation of the edge current density. This movement from proof of principle to production quality necessitates several alterations to the design. There will be a fourfold increase in the number of antennas, as minimising the sidelobe level is key to ensuring maximum resolution in the reconstructed Doppler backscattered power map. SAMI-U will actively probe the plasma with two frequencies at the same time. These correspond to two different backscattering locations in the edge plasma which allows the edge current density to be calculated from the measured magnetic field vector. Dual-polarised sinuous antennas will be used in the array as they are planar and broadband. Polarisation separation is necessary for differentiation between the O-and X-mode cut off surfaces, as their locations can be separated by up to a few centimetres. Due to spatial constraints many of the components will be placed on a PCB behind each antenna. FPGAs will be used to stream the high data throughput, over 16 GB s− 1, into PC memory.
MAST 上 ELM 期间的局部微波爆发
影响因子：
--
作者：
Freethy S
通讯作者：
Freethy S