Calibration of VELC detectors on-board Aditya-L1 mission

IF 2.7 3区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Experimental Astronomy Pub Date : 2024-03-01 DOI:10.1007/s10686-024-09922-2

Shalabh Mishra, Sasikumar Raja K, Sanal Krishnan VU, Venkata Suresh Narra, Bhavana Hegde S, Utkarsha D, Muthu Priyal V, Pawan Kumar S, Natarajan V, Raghavendra Prasad B, Jagdev Singh, Umesh Kamath P, Kathiravan S, Vishnu T, Suresha, Savarimuthu P, Jalshri H Desai, Rajiv Kumaran, Shiv Sagar, Sumit Kumar, Inderjeet Singh Bamrah, Amit Kumar

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Abstract

Aditya-L1 is the first Indian space mission to explore the Sun and solar atmosphere with seven multi-wavelength payloads, with Visible Emission Line Coronagraph (VELC) being the prime payload. It is an internally occulted coronagraph with four channels to image the Sun at 5000 Å in the field of view 1.05 - 3 \(\varvec{R}_{\odot }\), and to pursue spectroscopy at 5303 Å, 7892 Å and 10747 Å channels in the FOV (1.05 - 1.5 \(\varvec{R}_{\odot }\)). In addition, spectropolarimetry is planned at 10747 Å channel. Therefore, VELC has three sCMOS detectors and one InGaAs detector. In this article, we aim to describe the technical details and specifications of the detectors achieved by way of thermo-vacuum calibration at the CREST campus of the Indian Institute of Astrophysics, Bangalore, India. Furthermore, we report the estimated conversion gain, full-well capacity, and readout noise at different temperatures. Based on the numbers, it is thus concluded that it is essential to operate the sCMOS detectors and InGaAs detector at \(\varvec{-5^\circ }\) and \(\varvec{-17^{\circ }}\) C, respectively, at the spacecraft level.

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校准 Aditya-L1 飞行任务搭载的 VELC 探测器

Aditya-L1是印度首次利用七个多波长有效载荷探索太阳和太阳大气层的空间飞行任务，其中可见发射线日冕仪（VELC）是主要有效载荷。它是一个内部掩蔽式日冕仪，有四个通道，可在 1.05 - 3 \(\varvec{R}_{\odot }\) 的视场中以 5000 Å 的波长对太阳成像，并在视场（1.05 - 1.5 \(\varvec{R}_{\odot }\) 中以 5303 Å、7892 Å 和 10747 Å 的波长进行光谱测量。）此外，还计划在 10747 Å 频道上进行分光测极。因此，VELC 有三个 sCMOS 探测器和一个 InGaAs 探测器。在这篇文章中，我们将介绍在印度班加罗尔印度天体物理研究所 CREST 校区通过热真空校准实现的探测器的技术细节和规格。此外，我们还报告了不同温度下的估计转换增益、全阱容量和读出噪声。根据这些数据，我们得出结论，在航天器层面，必须分别在 \(\varvec{-5^\circ }\) 和 \(\varvec{-17^{\circ }}\) C 的温度下运行 sCMOS 探测器和 InGaAs 探测器。

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

Experimental Astronomy 地学天文-天文与天体物理

CiteScore

5.30

自引率

3.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Many new instruments for observing astronomical objects at a variety of wavelengths have been and are continually being developed. Furthermore, a vast amount of effort is being put into the development of new techniques for data analysis in order to cope with great streams of data collected by these instruments. Experimental Astronomy acts as a medium for the publication of papers of contemporary scientific interest on astrophysical instrumentation and methods necessary for the conduct of astronomy at all wavelength fields. Experimental Astronomy publishes full-length articles, research letters and reviews on developments in detection techniques, instruments, and data analysis and image processing techniques. Occasional special issues are published, giving an in-depth presentation of the instrumentation and/or analysis connected with specific projects, such as satellite experiments or ground-based telescopes, or of specialized techniques.