Matsuda F, Lowry L, Suzuki A, Aguilar Fáundez M, Arnold K, Barron D, Bianchini F, Cheung K, Chinone Y, Elleflot T, Fabbian G, Goeckner-Wald N, Hasegawa M, Kaneko D, Katayama N, Keating B, Lee A T, Navaroli M, Nishino H, Paar H, Puglisi G, Richards P L, Seibert J, Siritanasak P, Tajima O, Takatori S, Tsai C, Westbrook B
Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study,The University of Tokyo, Kashiwa, Chiba 277-8583, Japan.
Department of Physics, University of California, San Diego, California 92093-0424, USA.
Rev Sci Instrum. 2019 Nov 1;90(11):115115. doi: 10.1063/1.5095160.
We describe the Fourier Transform Spectrometer (FTS) used for in-field testing of the POLARBEAR receiver, an experiment located in the Atacama Desert of Chile which measures the cosmic microwave background (CMB) polarization. The POLARBEAR-FTS (PB-FTS) is a Martin-Puplett interferometer designed to couple to the Huan Tran Telescope (HTT) on which the POLARBEAR receiver is installed. The PB-FTS measured the spectral response of the POLARBEAR receiver with signal-to-noise ratio >20 for ∼69% of the focal plane detectors due to three features: a high throughput of 15.1 sr cm, optimized optical coupling to the POLARBEAR optics using a custom designed output parabolic mirror, and a continuously modulated output polarizer. The PB-FTS parabolic mirror is designed to mimic the shape of the 2.5 m-diameter HTT primary reflector, which allows for optimum optical coupling to the POLARBEAR receiver, reducing aberrations and systematics. One polarizing grid is placed at the output of the PB-FTS and modulated via continuous rotation. This modulation allows for decomposition of the signal into different harmonics that can be used to probe potentially pernicious sources of systematic error in a polarization-sensitive instrument. The high throughput and continuous output polarizer modulation features are unique compared to other FTS calibrators used in the CMB field. In-field characterization of the POLARBEAR receiver was accomplished using the PB-FTS in April 2014. We discuss the design, construction, and operation of the PB-FTS and present the spectral characterization of the POLARBEAR receiver. We introduce future applications for the PB-FTS in the next-generation CMB experiment, the Simons Array.
我们描述了用于POLARBEAR接收器现场测试的傅里叶变换光谱仪（FTS），该实验位于智利的阿塔卡马沙漠，用于测量宇宙微波背景（CMB）极化。POLARBEAR-FTS（PB-FTS）是一台马丁-普普莱特干涉仪，设计用于与安装有POLARBEAR接收器的 Huan Tran 望远镜（HTT）耦合。PB-FTS 测量了 POLARBEAR 接收器的光谱响应，由于三个特点，约69%的焦平面探测器的信噪比>20：15.1 sr cm 的高吞吐量、使用定制设计的输出抛物面镜优化与 POLARBEAR 光学系统的光耦合，以及连续调制的输出偏振器。PB-FTS 抛物面镜的设计模仿了直径 2.5 m 的 HTT 主反射镜的形状，这使得能够与 POLARBEAR 接收器实现最佳光耦合，减少像差和系统误差。一个偏振光栅放置在 PB-FTS 的输出端，并通过连续旋转进行调制。这种调制允许将信号分解为不同的谐波，可用于探测偏振敏感仪器中潜在的有害系统误差源。与CMB领域中使用的其他FTS校准器相比，高吞吐量和连续输出偏振器调制功能是独特的。2014年4月，使用PB-FTS完成了POLARBEAR接收器的现场表征。我们讨论了PB-FTS的设计、构造和操作，并展示了POLARBEAR接收器的光谱表征。我们介绍了PB-FTS在下一代CMB实验——西蒙斯阵列中的未来应用。
