Design and simulation of a wire position monitor for cryogenic systems in an ADS linac

This paper introduces the design and simulation of a Wire Position Monitor(WPM)used in the cryogenic system of an Accelerator Driven System(ADS).The WPM is designed to monitor the contraction of cold masses during the cooling-down operation.In this paper,POISSON-2D electrostatic field software is used to calculate the best characteristic impedance for the WPM.Furthermore,the time domain signal of different end structures is theoretically analyzed and simulated.The coupling of electrodes and the influence of signal carrier size,which may influence the induced signal,are also discussed.Finally,the linearity of the induced voltage and the sensitivity of the WPM are analyzed.The time domain simulation results are consistent with the theoretical analysis.The influences of the coupling and carrier size are very small,and the linearity of the normalized voltage is good within r/2.     

Design and simulation of a wire position monitor for cryogenic systems in an ADS linac

This paper introduces the design and simulation of a Wire Position Monitor （WPM） used in the cryogenic system of an Accelerator Driven System （ADS）. The WPM is designed to monitor the contraction of cold masses during the cooling-down operation. In this paper, POISSON-2D electrostatic field software is used to calculate the best characteristic impedance for the WPM. Furthermore, the time domain signal of different end structures is theoretically analyzed and simulated. The coupling of electrodes and the influence of signal carrier size, which may influence the induced signal, are also discussed. Finally, the linearity of the induced voltage and the sensitivity of the WPM are analyzed. The time domain simulation results are consistent with the theoretical analysis. The influences of the coupling and carrier size are very small, and the linearity of the normalized voltage is good within r/2.     

视觉测量中基于单应性矩阵的平面靶标图像特征提取

针对平面圆特征靶标和平面方格特征靶标图像,研究一种基于映射矩阵实现特征提取的新方法。根据靶标图像上至少4个角点位置的特征图像坐标及其对应的三维空间坐标建立靶标平面与像平面的单应性关系矩阵,结合已知的特征点空间坐标得到与已知空间坐标特征点相对应像面上特征点的粗略图像坐标,进而通过最小二乘椭圆拟合（圆特征靶标）或角点提取算...     

近景摄影测量技术在粒子加速器准直中的应用

第一次提出将近景摄影测量技术应用于国内粒子加速器隧道的控制点和设备测量,制定详细测量方案以适应加速器隧道狭窄空间环境,设计满足加速器隧道环境的半球目标、五面体目标,提出了编码立体化的方法,并在普通标准杆的短基线基准的基础上,增加跟踪仪测量的长基线基准进行约束。最后在中国散裂中子源的RCS环隧道中选取70 m长隧道进行测量实验,成功获取加速器控制网和设备的三维坐标,与激光跟踪仪结果对比,精度0.5 mm,显著提高测量效率,达到良好预期效果。