论文标题
马斯喀特焦平面验证
MUSCAT focal plane verification
论文作者
论文摘要
用于天文学的墨西哥-UK亚毫米计摄像头（MUSCAT）是在墨西哥直径为50 m的大型毫米望远镜（LMT）上安装在1.1 mm频段中运行的第二代大型连续摄像头。仪器的焦平面由1458号角耦合元素动力学探测器（Lekid）平均分为沉积在三个硅晶片上的六个通道。在这里，我们介绍了马斯喀特焦平面实验室的完整表征的初步结果。通过仪器的读数系统，我们执行阵列的频率清除以识别共振频率，并进行连续的时间播放，以测量和表征固有噪声和探测器的1/F膝关节。随后，使用重新成像的镜头和黑色体点源，每个检测器的光束都会映射，获得的平均FWHM尺寸为$ \ sim $ 3.27毫米，接近预期的3.1毫米。然后，通过改变光束填充黑色体源的强度，我们在300 K的光负载下测量每个检测器的响应性和噪声功率频谱密度（PSD），从而获得了噪声等效功率（NEP），通过这些探测器，我们验证了大多数检测器的大部分检测器是光子噪声的限制。最后，使用傅立叶变换光谱仪（FTS），我们测量仪器的光谱响应，该仪器的光谱响应表明带宽为1.0---1.2 mm，以1.1 mm为中心，如所预期。
The Mexico-UK Submillimetre Camera for Astronomy (MUSCAT) is the second-generation large-format continuum camera operating in the 1.1 mm band to be installed on the 50-m diameter Large Millimeter Telescope (LMT) in Mexico. The focal plane of the instrument is made up of 1458 horn coupled lumped-element kinetic inductance detectors (LEKID) divided equally into six channels deposited on three silicon wafers. Here we present the preliminary results of the complete characterisation in the laboratory of the MUSCAT focal plane. Through the instrument's readout system, we perform frequency sweeps of the array to identify the resonance frequencies, and continuous timestream acquisitions to measure and characterise the intrinsic noise and 1/f knee of the detectors. Subsequently, with a re-imaging lens and a black body point source, the beams of every detector are mapped, obtaining a mean FWHM size of $\sim$3.27 mm, close to the expected 3.1 mm. Then, by varying the intensity of a beam filling black body source, we measure the responsivity and noise power spectral density (PSD) for each detector under an optical load of 300 K, obtaining the noise equivalent power (NEP), with which we verify that the majority of the detectors are photon noise limited. Finally, using a Fourier Transform Spectrometer (FTS), we measure the spectral response of the instrument, which indicate a bandwidth of 1.0--1.2 mm centred on 1.1 mm, as expected.
