MUSCAT焦平面验证
MUSCAT focal plane verification
摘要：
墨西哥-联合王国亚毫米天文照相机（MUSCAT）是在1.1毫米波段工作的第二代大幅面连续照相机，将安装在墨西哥50米直径的大毫米望远镜上。该仪器的焦平面由1458个喇叭耦合集总元件动态电感探测器（LEKID）组成，平均分为六个通道，沉积在三个硅片上。在这里，我们提出了在实验室的MUSCAT焦平面的完整表征的初步结果。通过仪器的读出系统，我们进行频率扫描的阵列，以确定谐振频率，和连续的时间流采集测量和测量的固有噪声和1/f膝的检测器。随后，通过再成像透镜和黑体点源，映射每个探测器的光束，获得平均半高宽尺寸为$\sim$ 3.27 mm，接近预期的3.1 mm。然后，通过改变光束填充黑体源的强度，我们测量了每个探测器在300 K光负载下的响应度和噪声功率谱密度（PSD），得到了噪声等效功率（NEP），用它验证了大多数探测器是光子噪声受限的。最后，我们用傅里叶变换光谱仪（FTS）测量了仪器的光谱响应，结果表明，如预期的那样，带宽为1.0- 1.2mm，中心为1.1mm。
英文摘要：
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.
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