A Method to Retrieve the Total Flux at Lyman-Alpha in Micro-Channel-Plate Detectors Affected by Gain Sag: Application to the LAMP UV Imaging Spectrograph Onboard the Lunar Reconnaissance Orbiter

IF 1.5 Q3 ASTRONOMY & ASTROPHYSICS

Journal of Astronomical Instrumentation Pub Date : 2019-05-29 DOI:10.1142/S2251171719500028

C. Grava, T. Greathouse, K. Retherford, M. Davis, G. Gladstone, D. Kaufmann, A. Egan

引用次数: 3

Abstract

Micro-Channel Plate (MCP) detectors can suffer from a form of degradation known as gain sag in regions with significant fluence. We have developed a method to recover the total Lyman-Alpha (Ly-[Formula: see text]) emission line (121.6[Formula: see text]nm) flux for the Lyman-Alpha Mapping Project (LAMP) UV imaging spectrograph onboard of the Lunar Reconnaissance Orbiter (LRO), where gain sag issues are important. The constant ratio between the Ly-[Formula: see text] emission line and its ghost image at shorter wavelengths allows for a useful correction factor for the true flux at the Ly-[Formula: see text] region of the detector. A similar method could be used in other spectrographs whenever a ghost image of sufficient brightness is present.

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一种获取受增益凹陷影响的微通道板探测器中莱曼阿尔法总通量的方法——在月球勘测轨道器LAMP紫外成像光谱仪上的应用

微通道板（MCP）探测器在具有显著注量的区域可能遭受一种称为增益凹陷的退化形式。我们已经为月球勘测轨道飞行器（LRO）上的莱曼阿尔法测绘项目（LAMP）紫外线成像光谱仪开发了一种恢复莱曼阿尔法（Ly-[公式：见正文]）总发射线（121.6[公式：见正文]nm）通量的方法，在该方法中，增益凹陷问题很重要。Ly-[公式：见文本]发射线与其在较短波长下的重影图像之间的恒定比率允许对检测器的Ly-[方程式：见文本】区域处的真实通量进行有用的校正因子。只要存在足够亮度的重影图像，就可以在其他摄谱仪中使用类似的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Astronomical Instrumentation ASTRONOMY & ASTROPHYSICS-

CiteScore

2.30

自引率

7.70%

发文量

期刊介绍： The Journal of Astronomical Instrumentation (JAI) publishes papers describing instruments and components being proposed, developed, under construction and in use. JAI also publishes papers that describe facility operations, lessons learned in design, construction, and operation, algorithms and their implementations, and techniques, including calibration, that are fundamental elements of instrumentation. The journal focuses on astronomical instrumentation topics in all wavebands (Radio to Gamma-Ray) and includes the disciplines of Heliophysics, Space Weather, Lunar and Planetary Science, Exoplanet Exploration, and Astroparticle Observation (cosmic rays, cosmic neutrinos, etc.). Concepts, designs, components, algorithms, integrated systems, operations, data archiving techniques and lessons learned applicable but not limited to the following platforms are pertinent to this journal. Example topics are listed below each platform, and it is recognized that many of these topics are relevant to multiple platforms. Relevant platforms include: Ground-based observatories[...] Stratospheric aircraft[...] Balloons and suborbital rockets[...] Space-based observatories and systems[...] Landers and rovers, and other planetary-based instrument concepts[...]