학술논문
Calibration of VELC detectors on-board Aditya-L1 mission
Document Type
Working Paper
Author
Mishra, Shalabh; Raja, K. Sasikumar; U, Sanal Krishnan V; Narra, Venkata Suresh; S, Bhavana Hegde; D., Utkarsha; Priyal V, Muthu; S, Pawan Kumar; V, Natarajan; B, Raghavendra Prasad; Singh, Jagdev; P, Umesh Kamath; S, Kathiravan; T, Vishnu; Suresha; P, Savarimuthu; Desai, Jalshri H; Kumaran, Rajiv; Sagar, Shiv; Kumar, Sumit; Bamrah, Inderjeet Singh; Kumar, Amit
Source
Subject
Language
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 \AA~ in the field of view 1.05 - 3 \rsun, and to pursue spectroscopy at 5303 \AA, 7892 \AA~ and 10747 \AA~ channels in the FOV (1.05 - 1.5 \rsun). In addition, spectropolarimetry is planned at 10747 \AA~ 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 detectors at $-5^{\circ}$ and $-17^{\circ}$ C, respectively, at the spacecraft level.
Comment: Accepted for publication in Experimental Astronomy; 13 Pages, 5 Figures and 8 Tables
Comment: Accepted for publication in Experimental Astronomy; 13 Pages, 5 Figures and 8 Tables