25 September 2012 CMOS sensor and camera for the PHI instrument on board Solar Orbiter: evaluation of the radiation tolerance
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Abstract
The ESA/NASA Solar Orbiter mission, to be launched in 2017, will explore the Sun at a much closer distance than any previous solar observatory. On board the spacecraft, a high-resolution magnetograph (PHI) will provide two-dimensional measurements of the photospheric vector magnetic field and line-of-sight velocity. The environmental conditions encountered during the mission, together with the stringent performance requirements of the instrument, define the set of specifications for the camera system. A custom designed CMOS sensor (with 2048×2050 pixels) has been developed to fulfill the aimed radiation hardness and performance. This sensor must demonstrate a cadence above 10 fps with a full-well capacity higher than 105 electrons in a 10-μm pixel pitch. We report the characterization and qualification tests. The radiation test campaign has been completed up to a TID of 150 krad(Si), proton fluence up to 4 × 1011 at 10 MeV and 2 × 1011 at 20 MeV, and with heavy ions to check for latch-up and SEFI failures. In parallel, a radiation tolerant camera electronic readout system has been built to control the sensor and readout images, digitize the data, and communicate with the data handling system of the PHI instrument. In addition, we present the main issues related to the camera design and future perspectives.
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J. Piqueras, K. Heerlein, S. Werner, R. Enge, U. Schühle, J. Woch, T. De Ridder, G. Meynants, B. Wolfs, G. Lepage, W. Diels, "CMOS sensor and camera for the PHI instrument on board Solar Orbiter: evaluation of the radiation tolerance", Proc. SPIE 8453, High Energy, Optical, and Infrared Detectors for Astronomy V, 845314 (25 September 2012); doi: 10.1117/12.925403; https://doi.org/10.1117/12.925403
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