LSPE-SWIPE实验中半波片结构的优化
Optimization of the half wave plate configuration for the LSPE-SWIPE experiment
摘要：
寻找宇宙微波背景（CMB）的B模偏振是观测宇宙学的新前沿。B模式探测将最终证实暴胀情景中预测的原始引力波（GW）背景的存在。已经设计或计划了几个实验来观察B模式。在这项工作中，我们专注于即将到来的大规模偏振探测器（LSPE）的实验，这将致力于在大角度尺度的CMB偏振的准确测量。LSPE包括一个球载测辐射热仪器，即偏振探测器短波仪器和一个地面相干偏振计阵列，即平流层意大利偏振计。SWIPE将采用旋转半波片（HWP）偏振调制器，以减轻由于仪器非理想性造成的系统效应。我们在这里提出了初步的预测，旨在优化HWP配置。
英文摘要：
The search for the B-mode polarization of Cosmic Microwave Background (CMB) is the new frontier of observational Cosmology. A B-mode detection would give an ultimate confirmation to the existence of a primordial Gravitational Wave (GW) background as predicted in the inflationary scenario. Several experiments have been designed or planned to observe B-modes. In this work we focus on the forthcoming Large Scale Polarization Explorer (LSPE) experiment, that will be devoted to the accurate measurement of CMB polarization at large angular scales. LSPE consists of a balloon-borne bolometric instrument, the Short Wavelength Instrument for the Polarization Explorer (SWIPE), and a ground-based coherent polarimeter array, the STRatospheric Italian Polarimeter (STRIP). SWIPE will employ a rotating Half Wave Plate (HWP) polarization modulator to mitigate the systematic effects due to instrumental non-idealities. We present here preliminary forecasts aimed at optimizing the HWP configuration.
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