CCAT: A status update on the EoR-Spec instrument module for Prime-Cam

arXiv - PHYS - Instrumentation and Methods for Astrophysics Pub Date : 2024-09-09 DOI:arxiv-2409.05979

Rodrigo Freundt, Yaqiong Li, Doug Henke, Jason Austermann, James R. Burgoyne, Scott Chapman, Steve K. Choi, Cody J. Duell, Zach Huber, Michael Niemack, Thomas Nikola, Lawrence Lin, Dominik A. Riechers, Gordon Stacey, Anna K. Vaskuri, Eve M. Vavagiakis, Jordan Wheeler, Bugao Zou

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Abstract

The Epoch of Reionization Spectrometer (EoR-Spec) is an upcoming Line Intensity Mapping (LIM) instrument designed to study the evolution of the early universe (z = 3.5 to 8) by probing the redshifted [CII] 158 $\mu$m fine-structure line from aggregates of galaxies. The [CII] emission is an excellent tracer of star formation since it is the dominant cooling line from neutral gas heated by OB star light and thus can be used to probe the reionization of the early Universe due to star formation. EoR-Spec will be deployed on Prime-Cam, a modular direct-detection receiver for the 6-meter Fred Young Submillimeter Telescope (FYST), currently under construction by CPI Vertex Antennentechnik GmbH and to be installed near the summit of Cerro Chajnantor in the Atacama Desert. This instrument features an image plane populated with more than 6500 Microwave Kinetic Inductance Detectors (MKIDs) that are illuminated by a 4-lens optical design with a cryogenic, scanning Fabry-Perot Interferometer (FPI) at the pupil of the optical system. The FPI is designed to provide a spectral resolving power of $R\sim100$ over the full spectral range of 210--420 GHz. EoR-Spec will tomographically survey the E-COSMOS and E-CDFS fields with a depth of about 4000 hours over a 5 year period. Here we give an update on EoR-Spec's final mechanical/optical design and the current status of fabrication, characterization and testing towards first light in 2026.

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CCAT：Prime-Cam 的 EoR-Spec 仪器模块的最新情况

Epoch of Reionization Spectrometer（EoR-Spec）是一个即将推出的线强度绘图（LineIntensity Mapping，LIM）仪器，旨在通过探测来自星系聚集体的红移[CII] 158 $\mu$mine-structure线来研究早期宇宙（z = 3.5-8）的演化。CII]发射是恒星形成的一个极好的示踪线，因为它是被OB恒星光加热的中性气体的主要冷却线，因此可以用来探测恒星形成导致的早期宇宙的电离。EoR-Spec将部署在Prime-Cam上，Prime-Cam是6米弗雷德-杨亚毫米波望远镜（FYST）的模块化直接探测接收器，目前由CPIVertex天线技术有限公司建造，将安装在阿塔卡马沙漠的CerroChajnantor山顶附近。该仪器的特点是图像平面上布满了 6500 多个微波动感探测器（MKID），这些探测器由 4 镜式光学设计照射，光学系统的瞳孔处装有一个低温扫描式法布里珀罗干涉仪（FPI）。FPI 的设计目的是在 210-420 GHz 的全光谱范围内提供 $R\sim100$ 的光谱分辨能力。EoR-Spec 将在 5 年内对 E-COSMOS 和 E-CDFS 场进行深度约 4000 小时的层析成像测量。在此，我们将介绍EoR-Spec最终机械/光学设计的最新情况，以及为实现2026年首照而进行的制造、表征和测试的现状。

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arXiv - PHYS - Instrumentation and Methods for Astrophysics

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