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首页> 外文期刊>The Astrophysical journal >Spider Optimization: Probing The Systematics Of A Large-scale B-mode Experiment
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Spider Optimization: Probing The Systematics Of A Large-scale B-mode Experiment

机译：蜘蛛优化：探索大规模B模式实验的系统性

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摘要

Spider is a long-duration, balloon-borne polarimeter designed to measure large-scale cosmic microwave background (CMB) polarization with very high sensitivity and control of systematics. The instrument will map over half the sky with degree angular resolution in the I, Q, and U Stokes parameters in four frequency bands from 96 to 275 GHz. Spider's ultimate goal is to detect the primordial gravity-wave signal imprinted on the CMB B-mode polarization. One of the challenges in achieving this goal is the minimization of the contamination of B-modes by systematic effects. This paper explores a number of instrument systematics and observing strategies in order to optimize B-mode sensitivity. This is done by injecting realistic-amplitude, time-varying systematics into a set of simulated time streams. Tests of the impact of detector noise characteristics, pointing jitter, payload pendulations, polarization angle offsets, beam systematics, and receiver gain drifts are shown. Spider's default observing strategy is to spin continuously in azimuth, with polarization modulation achieved by either a rapidly spinning half-wave plate or a rapidly spinning gondola and a slowly stepped half-wave plate. Although the latter is more susceptible to systematics, the results shown here indicate that either mode of operation can be used by Spider.
机译：Spider是一种长期的气球式偏振计，设计用于以很高的灵敏度和系统的控制力来测量大规模宇宙微波背景（CMB）偏振。该仪器将在I，Q和U斯托克斯参数中以度角分辨率在96到275 GHz的四个频段上绘制一半的天空。 Spider的最终目标是检测刻在CMB B模式极化上的原始重力波信号。实现这一目标的挑战之一是将系统效应对B模式的污染降至最低。本文探索了许多仪器系统和观测策略，以优化B模式灵敏度。这是通过将现实幅度随时间变化的系统变量注入一组模拟时间流中来完成的。显示了对检测器噪声特性，指向抖动，有效载荷摆幅，偏振角偏移，波束系统和接收器增益漂移的影响的测试。 Spider的默认观察策略是连续旋转方位角，通过快速旋转的半波板或快速旋转的吊篮和缓慢步进的半波板实现偏振调制。尽管后者更容易受到系统的影响，但此处显示的结果表明Spider可以使用任一种操作模式。

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