SWIPE：用于大尺度偏振探测器的测辐射热偏振计
SWIPE: a bolometric polarimeter for the Large-Scale Polarization Explorer
摘要：
球载LSPE任务的优化测量大角度尺度的宇宙微波背景的线偏振。用于偏振探测器的短波长仪器（SWIPE）由3个多模测辐射热计阵列组成，冷却温度为0.3K，光学元件和滤波器低温冷却至4K以下，以减少探测器上的背景。偏振测量是通过在阵列前放置大的旋转半波片和线栅偏振器来实现的。偏振调制器是光学链的第一个组件，显著降低了仪器偏振的影响。在SWIPE中，我们用角分辨率换取灵敏度。折射望远镜的入射光瞳直径为45厘米，而场光学系统经过优化，可以为每个探测器收集数十种模式，从而提高吸收功率。该方法在95、145、245 GHz处分别产生1.8、1.5、1.2度的FWHM分辨率。三个通道的预期性能受到光子噪声的限制，导致对于覆盖25%天空的13天调查，每束光的最终灵敏度约为0.1-0.2 uK。
英文摘要：
The balloon-borne LSPE mission is optimized to measure the linear polarization of the Cosmic Microwave Background at large angular scales. The Short Wavelength Instrument for the Polarization Explorer (SWIPE) is composed of 3 arrays of multi-mode bolometers cooled at 0.3K, with optical components and filters cryogenically cooled below 4K to reduce the background on the detectors. Polarimetry is achieved by means of large rotating half-wave plates and wire-grid polarizers in front of the arrays. The polarization modulator is the first component of the optical chain, reducing significantly the effect of instrumental polarization. In SWIPE we trade angular resolution for sensitivity. The diameter of the entrance pupil of the refractive telescope is 45 cm, while the field optics is optimized to collect tens of modes for each detector, thus boosting the absorbed power. This approach results in a FWHM resolution of 1.8, 1.5, 1.2 degrees at 95, 145, 245 GHz respectively. The expected performance of the three channels is limited by photon noise, resulting in a final sensitivity around 0.1-0.2 uK per beam, for a 13 days survey covering 25% of the sky.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
