Launched on 2021 December 9, the Imaging X-ray Polarimetry Explorer (IXPE) is a NASA Small Explorer Mission in collaboration with the Italian Space Agency (ASI). The mission will open a new window of investigation—imaging x-ray polarimetry. The observatory features three identical telescopes, each consisting of a mirror module assembly with a polarization-sensitive imaging x-ray detector at the focus. A coilable boom, deployed on orbit, provides the necessary 4-m focal length. The observatory utilizes a three-axis-stabilized spacecraft, which provides services such as power, attitude determination and control, commanding, and telemetry to the ground. During its 2-year baseline mission, IXPE will conduct precise polarimetry for samples of multiple categories of x-ray sources, with follow-on observations of selected targets.
Geiger-mode Avalanche Photodiode (GmAPD) sensors operating in the short-wave infrared wavelength range provide single-photon sensitivity along with precise time-of-flight measurement capability. Cameras built from such sensors are uniquely suited for use in LIDAR systems. We present the development of a computational model of a GmAPD device. We apply this model to identify and optimize key parameters in the epitaxial growth structure, with the goal of producing maximum photon detection efficiency while maintaining a low dark count rate. These simulations suggest a modest design adjustment will result in a relative increase in detection efficiency of more than 15% at typical operating bias voltage, when compared to a legacy control design. A new epitaxial growth and device fabrication campaign has been executed to test the results of the simulation. We will present test results from sensor devices fabricated from both the optimized and control designs.
Scheduled to launch in late 2021 the Imaging X-ray Polarimetry Explorer (IXPE) is a Small Explorer Mission designed to open up a new window of investigation -- X-ray polarimetry. The IXPE observatory features 3 identical telescope each consisting of a mirror module assembly with a polarization-sensitive imaging x-ray detector at its focus. An extending beam, deployed on orbit provides the necessary 4 m focal length. The payload sits atop a 3-axis stabilized spacecraft which among other things provides power, attitude determination and control, commanding, and telemetry to the ground. During its 2-year baseline mission, IXPE will conduct precise polarimetry for samples of multiple categories of x-ray sources, with follow-on observations of selected targets. IXPE is a partnership between NASA and the Italian Space Agency (ASI).
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