5 August 2016 Development of the x-ray camera for the OGRE sub-orbital rocket
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Abstract
Current theories regarding the matter composition of the universe suggest that half of the expected baryonic matter is missing. One region this could be residing in is intergalactic filaments which absorb strongly in the X-ray regime. Present space based technology is limited when it comes to imaging at these wavelengths and so new techniques are required. The Off-Plane Grating Rocket Experiment (OGRE) aims to produce the highest resolution spectrum of the binary star system Capella, a well-known X-ray source, in the soft X-ray range (0.2keV to 2keV). This will be achieved using a specialised payload combining three low technology readiness level components placed on-board a sub-orbital rocket. These three components consist of an array of large format off-plane X-ray diffraction gratings, a Wolter Type 1 mirror made using single crystal silicon, and the use of EM-CCDs to capture soft X-rays. Each of these components have been previously reviewed with OGRE being the first project to utilise them in a space observation mission. This paper focuses on the EM-CCDs (CCD207-40 by e2v) that will be used and their optimisation with a camera purposely designed for OGRE. Electron Multiplying gain curves were produced for the back-illuminated devices at -80C. Further tests which will need to be carried out are discussed and the impact of the OGRE mission on future projects mentioned.
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Matthew R. F. Lewis, Matthew R. F. Lewis, Matthew R Soman, Matthew R Soman, Andrew D. Holland, Andrew D. Holland, Neil J. Murray, Neil J. Murray, David Hall, David Hall, Daniel P. Weatherill, Daniel P. Weatherill, James H. Tutt, James H. Tutt, Randall L. McEntaffer, Randall L. McEntaffer, Casey T. DeRoo, Casey T. DeRoo, Ted B. Schultz, Ted B. Schultz, Karen Holland, Karen Holland, } "Development of the x-ray camera for the OGRE sub-orbital rocket", Proc. SPIE 9915, High Energy, Optical, and Infrared Detectors for Astronomy VII, 991506 (5 August 2016); doi: 10.1117/12.2232812; https://doi.org/10.1117/12.2232812
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