DECal：DECam分光光度定标系统
DECal: A Spectrophotometric Calibration System For DECam
摘要：
DECal是CTIO 4 m Blanco望远镜的一个新的定标系统。它目前正在安装作为暗能量调查的一部分，并将提供宽带平场和窄带（约1纳米带宽）的光谱校准的新的暗能量相机（DECam）。这两个系统共享一个新的朗伯平面场屏幕。宽带平场系统使用LED照亮每个光度滤光片。分光光度校准系统由一个基于单色器的可调光源组成，该光源使用定制的线到点光纤束和工程漫射器投射到平场屏幕上。沿着光束放置的几个校准的光电二极管监测作为波长的函数的望远镜吞吐量。该系统将测量整个望远镜+仪器系统在300 < lambda <1100 nm范围内的波长相关仪器响应函数。分光光度计校准将定期进行（大约每月一次），以确定DECam系统的光谱响应，并在为期五年的暗能量调查项目期间监测仪器通量的变化。
英文摘要：
DECal is a new calibration system for the CTIO 4 m Blanco telescope. It is currently being installed as part of the Dark Energy Survey and will provide both broadband flat fields and narrowband (about 1 nm bandwidth) spectrophotometric calibration for the new Dark Energy Camera (DECam). Both of these systems share a new Lambertian flat field screen. The broadband flat field system uses LEDs to illuminate each photometric filter. The spectrophotometric calibration system consists of a monochromator-based tunable light source that is projected onto the flat field screen using a custom line-to-spot fiber bundle and an engineered diffuser. Several calibrated photodiodes positioned along the beam monitor the telescope throughput as a function of wavelength. This system will measure the wavelength-dependent instrumental response function of the total telescope+instrument system in the range 300 < lambda < 1100nm. The spectrophotometric calibration will be performed regularly (roughly once per month) to determine the spectral response of the DECam system and to monitor changes in instrumental throughput during the five year Dark Energy Survey project.
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