Soman, MR;
Hall, DJ;
Holland, AD;
Burgon, R;
Buggey, T;
Skottfelt, J;
Sembay, S;
... Woffinden, C; + view all
(2018)
The SMILE Soft X-ray Imager (SXI) CCD design and development.
In:
11th International Conference on Position Sensitive Detectors (PSD11).
(pp. C01022).
IOP Publishing Ltd and Sissa Medialab
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Abstract
SMILE, the Solar wind Magnetosphere Ionosphere Link Explorer, is a joint science mission between the European Space Agency and the Chinese Academy of Sciences. The spacecraft will be uniquely equipped to study the interaction between the Earth's magnetosphere-ionosphere system and the solar wind on a global scale. SMILE's instruments will explore this science through imaging of the solar wind charge exchange soft X-ray emission from the dayside magnetosheath, simultaneous imaging of the UV northern aurora and in-situ monitoring of the solar wind and magnetosheath plasma and magnetic field conditions. The Soft X-ray Imager (SXI) is the instrument being designed to observe X-ray photons emitted by the solar wind charge exchange process at photon energies between 200 eV and 2000 eV . X-rays will be collected using a focal plane array of two custom-designed CCDs, each consisting of 18 μm square pixels in a 4510 by 4510 array. SMILE will be placed in a highly elliptical polar orbit, passing in and out of the Earth's radiation belts every 48 hours. Radiation damage accumulated in the CCDs during the mission's nominal 3-year lifetime will degrade their performance (such as through decreases in charge transfer efficiency), negatively impacting the instrument's ability to detect low energy X-rays incident on the regions of the CCD image area furthest from the detector outputs. The design of the SMILE-SXI CCDs is presented here, including features and operating methods for mitigating the effects of radiation damage and expected end of life CCD performance. Measurements with a PLATO device that has not been designed for soft X-ray signal levels indicate a temperature-dependent transfer efficiency performance varying between 5×10−5 and 9×10−4 at expected End of Life for 5.9 keV photons, giving an initial set of measurements from which to extrapolate the performance of the SXI CCDs.
| Type: | Proceedings paper |
|---|---|
| Title: | The SMILE Soft X-ray Imager (SXI) CCD design and development |
| Event: | 11th International Conference on Position Sensitive Detectors (PSD) |
| Location: | Open Univ, Milton Keynes, ENGLAND |
| Dates: | 03 September 2017 - 08 September 2017 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/1748-0221/13/01/C01022 |
| Publisher version: | http://dx.doi.org/10.1088/1748-0221/13/01/C01022 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Technology, Instruments & Instrumentation, Solid state detectors, Space instrumentation, X-ray detectors, X-ray detectors and telescopes, Charge-Coupled-Devices, Solar-Wind, Magnetosphere, Damage |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10043250 |
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