The status of the QUIJOTE multi-frequency instrument
The status of the QUIJOTE multi-frequency instrument
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QUIJOTE多频仪的状态
DOI：
10.1117/12.925349
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Hoyland R
中科院分区：
文献类型：
--
作者：
Hoyland R
QUIJOTE-CMB项目已在以前的出版物中进行了描述。在这里，我们介绍了QUIJOTE多频仪器（MFI）的当前状态，它具有五个独立的偏振计（提供5个独立的天空像素）：两个工作在10-14 GHz，两个工作在16-20 GHz，一个工作在30 GHz的中心偏振计。该光学装置包括5个圆锥形波纹喇叭天线，凝视着一个双反射器交叉苛刻系统，该系统提供最佳的交叉偏振特性（设计为< −35 dB）和对称光束。每个喇叭都馈入一个新型的低温同轴旋转极化调制器，其旋转速度可达1 Hz。第一台仪器的科学驱动力是对银河系发射的表征。旋光仪使用极化调制器导出线性极化参数Q、U和I，并切换出各种系统。检测系统通过2个相关通道和2个总功率通道提供最佳灵敏度。该系统是校准使用明亮的偏振天体源，并通过一个辅助校准源和天线。采集系统、望远镜控制和内务管理都通过实时千兆以太网连接。所有的通讯、动力和氦气都通过一个中心旋转接头。时间戳与GPS时间信号同步。采集软件基于Beckhoffs TwinCat和ethercat编写的PLC。用户界面用LABVIEW编写。将介绍QUIJOTE MFI的状态，包括预调试结果和实验室测试。
The QUIJOTE-CMB project has been described in previous publications. Here we present the current status of the QUIJOTE multi-frequency instrument (MFI) with five separate polarimeters (providing 5 independent sky pixels): two which operate at 10-14 GHz, two which operate at 16-20 GHz, and a central polarimeter at 30 GHz. The optical arrangement includes 5 conical corrugated feedhorns staring into a dual reflector crossed-draconian system, which provides optimal cross-polarization properties (designed to be < −35 dB) and symmetric beams. Each horn feeds a novel cryogenic on-axis rotating polar modulator which can rotate at a speed of up to 1 Hz. The science driver for this first instrument is the characterization of the galactic emission. The polarimeters use the polar modulator to derive linear polar parameters Q, U and I and switch out various systematics. The detection system provides optimum sensitivity through 2 correlated and 2 total power channels. The system is calibrated using bright polarized celestial sources and through a secondary calibration source and antenna. The acquisition system, telescope control and housekeeping are all linked through a real-time gigabit Ethernet network. All communication, power and helium gas are passed through a central rotary joint. The time stamp is synchronized to a GPS time signal. The acquisition software is based on PLCs written in Beckhoffs TwinCat and ethercat. The user interface is written in LABVIEW. The status of the QUIJOTE MFI will be presented including pre-commissioning results and laboratory testing.
QUIJOTE多频仪控制系统架构
DOI：
10.1117/12.926416
发表时间：
2012
期刊：
Proceedings of the Fourth European Conference on Antennas and Propagation
影响因子：
--
作者：
M. F. Gómez;M. Aguiar;J. Herreros;R. Hoyland;V. Sánchez de la Rosa;A. Vega;T. Viera;R. Génova;C. López;R. Rebolo;J. Rubiño
通讯作者：
J. Rubiño