H. Jansen, S. Spannagel, J. Behr, A. Bulgheroni, G. Claus, E. Corrin, D. G. Cussans, J. Dreyling-Eschweiler, D. Eckstein, T. Eichhorn, M. Goffe, I. M. Gregor, D… 展开作者
H. Jansen, S. Spannagel, J. Behr, A. Bulgheroni, G. Claus, E. Corrin, D. G. Cussans, J. Dreyling-Eschweiler, D. Eckstein, T. Eichhorn, M. Goffe, I. M. Gregor, D. Haas, C. Muhl, H. Perrey, R. Peschke, P. Roloff, I. Rubinskiy, M. Winter
Test beam measurements at the test beam facilities of DESY have been conducted to characterise the performance of the EUDET-type beam telescopes originally developed within the EUDET project. The beam telescopes are equipped with six sensor planes using MIMOSA26 monolithic active pixel devices. A programmable Trigger Logic Unit provides trigger logic and time stamp information on particle passage. Both data acquisition framework and offline reconstruction software packages are available. User devices are easily integrable into the data acquisition framework via predefined interfaces.
The biased residual distribution is studied as a function of the beam energy, plane spacing and sensor threshold. Its standard deviation at the two centre pixel planes using all six planes for tracking in a 6\,GeV electron/positron-beam is measured to be $(2.88\,\pm\,0.08)\,\upmu\meter$.Iterative track fits using the formalism of General Broken Lines are performed to estimate the intrinsic resolution of the individual pixel planes. The mean intrinsic resolution over the six sensors used is found to be $(3.24\,\pm\,0.09)\,\upmu\meter$.With a 5\,GeV electron/positron beam, the track resolution halfway between the two inner pixel planes using an equidistant plane spacing of 20\,mm is estimated to $(1.83\,\pm\,0.03)\,\upmu\meter$ assuming the measured intrinsic resolution. Towards lower beam energies the track resolution deteriorates due to increasing multiple scattering. Threshold studies show an optimal working point of the MIMOSA26 sensors at a sensor threshold of between five and six times their RMS noise. Measurements at different plane spacings are used to calibrate the amount of multiple scattering in the material traversed and allow for corrections to the predicted angular scattering for electron beams.
Design and simulation of the High-Energy Proton Beam Telescope
Institute of High Energy Physics, Chinese Academy of Sciences(中国科学院高能物理研究所);Spallation Neutron Source Science Center(散裂中子源科学中心);Zhengzhou Railway Vocational and Technical College(郑州铁路职业技术学院);University of Chinese Academy of Sciences(中国科学院大学)
HARPO: 1.7 - 74 MeV gamma-ray beam validation of a high angular resolutio n, high linear polarisation dilution, gas time projection chamber telescope and polarimeter
Development and demonstration of the Korea ALICE Telescope using electron beams at KEK PF-AR
Inha University(仁荷大学);Pusan National University(釜山国立大学);University of Tsukuba(筑波大学);University of Tokyo(东京大学);Yonsei University(延世大学);Hiroshima University(广岛大学)
Performance measurement of HARPO: a Time Projection Chamber as a gamma-ray telescope and polarimeter
我们分析了气体时间投影室(TPC)作为高性能的伽马射线望远镜和偏振仪在e $^+$ e $^-$对创建制度的性能。我们使用在已知偏振的伽马射线束收集的数据。TPC提供由气体体积中的每次转换引起的轨迹的两个正交投影$(x,z)$和$(y,z)$。我们使用一个简单的顶点查找程序,其中顶点和伪轨迹退出他们被确定。我们用蒙特卡罗模拟研究了单光子角分辨率的各种贡献,并将它们与实验数据进行了比较,发现它们非常吻合。由于探测器的非圆柱对称结构,对转换的方位角分布显示出偏差。这种偏差将在太空任务的长时间曝光中达到平均值,但对于这种双光束表征,我们通过双系统控制方案确保了其准确模拟,数据采集采用相对于光束偏振方向旋转几个角度的探测器,并采用非偏振光束进行系统控制。我们测量,第一次,在低能量对创建制度的线性偏振伽马射线束的偏振不对称性。这个亚GeV的能量范围对于宇宙源来说是至关重要的,因为它们的光谱是幂律的,随着能量的增加而迅速下降。这项工作可以为将极化伽马射线天文学扩展到MeV能量范围之外铺平道路。
Full Characterisation of the Polarisation Primary Beam of the GRAO 32-m Telescope
Ghana Space Science and Technology Institute Ghana Atomic Energy Commission(加纳空间科学与研究所 加纳原子能委员会);University of California Santa Cruz(加州大学圣克鲁兹分校);University of Nigeria Nsukka(尼日利亚恩苏卡大学)
Digital Beam Pattern Optimisation for the GRAO 32-m Telescope: A Comparative Analysis of FIR Filter Design Methods
Ghana Space Science and Technology Institute Ghana Atomic Energy Commission(加纳空间科学与研究所 加纳原子能委员会);Astronomy and Astrophysics Department University of California Santa Cruz(加州大学圣克鲁兹分校 天文学与天体物理学系)
本文详细介绍了基于UTR-2射电望远镜的宽带模拟数字日像仪。该装置的工作原理是采用并-串联原理,使扫描给定射电源(如日冕)的五个等间距阵列图案光束同时成形。因此,所获得的图像呈现出在25 MHz下空间分辨率为25' x 25'的5 x 8像素的帧。每个像素对应于来自适当图案光束的信号。日像仪最重要的组成部分是它的相移模块,用于通过螺旋形天线波束进行快速天空扫描。文中还介绍了它的设计和开关电缆长度的计算方法。在实际的日像仪中,每一幅日像图都是用这种移相器形成的。从相应的天线方向图波束接收的信号的每个像素是用数字频谱处理器实时测量的互相关动态频谱(时间-频率-强度)。新一代日像仪在8-32 MHz频率范围内获得日冕图像,频率分辨率为4 kHz,时间分辨率为1 ms,动态范围约为90 dB。以2010年夏季的射电源和日冕的日面观测为例进行了说明。
Contributions to free-space optical communications: feasibility of utilizing Cherenkov telescopes as receivers and beam-wander correction in quantum communications