NASA NTRS · 20190029099
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Ramsey, Brian. 2019-08-12. IXPE Mirror Module Assemblies. https://ntrs.nasa.gov/citations/20190029099
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The Imaging X-ray Polarimetry Explorer (IXPE) project is an international collaboration to build and fly a polarization sensitive X-ray observatory. The IXPE Observatory consists of the spacecraft and payload. The payload is composed of three X-ray telescopes, each consisting of a mirror module optical assembly and a polarization-sensitive X-ray detector assembly; a deployable boom maintains the focal length between the optical assemblies and the detectors. The goal of the IXPE Mission is to provide new information about the origins of cosmic X-rays and their interactions with matter and gravity as they travel through space. IXPE will do this by exploiting its unique capability to measure the polarization of X-rays emitted by cosmic sources. The collaboration for IXPE involves national and international partners during design, fabrication, assembly, integration, test, and operations. The full collaboration includes NASA Marshall Space Flight Center (MSFC), Ball Aerospace, the Italian Space Agency (ASI), the Italian Institute of Astrophysics and Space Planetology (IAPS)/Italian National Institute of Astrophysics (INAF), the Italian National Institute for Nuclear Physics (INFN), the University of Colorado (CU) Laboratory for Atmospheric and Space Physics (LASP), Stanford University, McGill University, and the Massachusetts Institute of Technology. The goal of this paper is to discuss risk management as it applies to the IXPE project. The full IXPE Team participates in risk management providing both unique challenges and advantages for project risk management. Risk management is being employed in all phases of the IXPE Project, but is particularly important during planning and initial execution-the current phase of the IXPE Project. The discussion will address IXPE risk strategies and responsibilities, along with the IXPE management process which includes risk identification, risk assessment, risk response, and risk monitoring, control, and reporting.
At z=0.03, Mrk 421 is one of the closest Blazars and hence an exceptional target for X-ray polarization. In December of 2023, IXPE monitored Mrk 421 for approximately two weeks, in order to investigate the possible origins of X-ray polarization variability previously seen in this target, and whether it might originate in a shock propagating through the field lines of an energy-stratified jet. We present the results of the IXPE campaign, which is also complemented by NuSTAR, XMM-Newton, Swift, and ground-based monitoring.
At z=0.03, Mrk 421 is one of the closest Blazars and hence an exceptional target for X-ray polarization. In December of 2023, IXPE monitored Mrk 421 for approximately two weeks, in order to investigate the possible origins of X-ray polarization variability previously seen in this target, and whether it might originate in a shock propagating through the field lines of an energy-stratified jet. We present the results of the IXPE campaign, which is also complemented by NuSTAR, XMM-Newton, Swift, and ground-based monitoring.