A new detector concept for energetic auroral x ray imaging

Physics

Scientific paper

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Auroras, Cameras, Diodes, Photomultiplier Tubes, Satellite-Borne Instruments, Scintillation Counters, X Ray Detectors, Bremsstrahlung, Electron Precipitation, Silicon, X Ray Imagery

Scientific paper

Energetic electrons being precipitated from the Earth's magnetosphere into the upper atmosphere in the auroral regions, emit bremsstrahlung X-rays. From a satellite an X-ray camera can be used for remote mapping of this electron precipitation. In connection with projects like Aurio (Auroral Imaging Observatory), selected for flight in ESA's polar platform program, it is desirable to develop new and better imaging detectors to cover especially the high energy range (about 10 to 150 keV). Scintillation crystals provide sufficient stopping efficiency at high X-ray energies. A scintillation readout device, the Electron bombarded silicon Diode Photo Multiplier Tube (EDPMT) is described with the first experimental results. Some ideas on how the EDPMT can be made position sensitive to be used together with a scintillating plate as a rugged and simple X-ray camera are presented.

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