We present the integration of a new calibration system into the Faint Intergalactic-medium Redshifted Emission Balloon-2 (FIREBall-2), which added in-flight calibration capability for the recent September 2023 flight. This system is composed of a calibration source box containing zinc and deuterium lamp sources, focusing optics, electronics, sensors, and a fiber-fed calibration cap with an optical shutter mounted on the spectrograph tank. We discuss how the calibration cap is optimized to be evenly illuminated through non-sequential modeling for the near-UV (191 to 221 nm) for spectrograph slit mask position calibration, electron multiplying charged-coupled device (EMCCD) gain amplification verification, and wavelength calibration. Then, we present the pre-flight performance testing results of the calibration system and their implications for in-flight measurements. FIREBall-2 flew in 2023, but did not collect calibration data due to early termination of the flight.

中文翻译：

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FIREBall-2 紫外气球望远镜飞行中校准系统


我们将新的校准系统集成到微弱星际介质红移发射气球 2 (FIREBall-2) 中，为最近 2023 年 9 月的飞行增加了飞行中校准功能。该系统由包含锌和氘灯源的校准源盒、聚焦光学器件、电子器件、传感器以及安装在光谱仪槽上的带有光学快门的光纤馈送校准帽组成。我们讨论如何通过近紫外光（191 至 221 nm）的非序列建模来优化校准帽均匀照明，以进行光谱仪狭缝掩模位置校准、电子倍增电荷耦合器件 (EMCCD) 增益放大验证和波长校准。然后，我们介绍校准系统的飞行前性能测试结果及其对飞行中测量的影响。 FIREBall-2于2023年飞行，但由于提前终止飞行而没有收集校准数据。