The wide field monitor onboard the eXTP mission

M. Hernanz, S. Brandt, M. Feroci, P. Orleansky, A. Santangelo, S. Schanne, Xin Wu, J. In'T Zand, S. Zhang, Y. P. Xu, E. Bozzo, Y. Evangelista, J. L. Gálvez, C. Tenzer, F. Zwart, F. J. Lu, S. Zhang, T. X. Cheng, F. Ambrosino, A. ArganE. Del Monte, C. Budtz-Jørgensen, N. Lund, P. Olsen, C. Mansanet, R. Campana, F. Fuschino, C. Labanti, A. Rachevski, A. Vacchi, G. Zampa, N. Zampa, I. Rashevskaya, P. Bellutti, G. Borghi, F. Ficorella, A. Picciotto, N. Zorzi, O. Limousin, A. Meris

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


The eXTP (enhanced X-ray Timing and Polarimetry) mission is a major project of the Chinese Academy of Sciences (CAS) and China National Space Administration (CNSA) currently performing an extended phase A study and proposed for a launch by 2025 in a low-earth orbit. The eXTP scientific payload envisages a suite of instruments (Spectroscopy Focusing Array, Polarimetry Focusing Array, Large Area Detector and Wide Field Monitor) offering unprecedented simultaneous wide-band X-ray timing and polarimetry sensitivity. A large European consortium is contributing to the eXTP study and it is expected to provide key hardware elements, including a Wide Field Monitor (WFM). The WFM instrument for eXTP is based on the design originally proposed for the LOFT mission within the ESA context. The eXTP/WFM envisages a wide field X-ray monitor system in the 2-50 keV energy range, achieved through the technology of the large-area Silicon Drift Detectors. The WFM will consist of 3 pairs of coded mask cameras with a total combined Field of View (FoV) of 90×180 degrees at zero response and a source localization accuracy of ∼1 arcmin. In this paper we provide an overview of the WFM instrument design, including new elements with respect to the earlier LOFT configuration, and anticipated performance.

Original languageEnglish
Title of host publicationSpace Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray
Number of pages17
PublisherSPIE - International Society for Optical Engineering
Publication date2018
Article number1069948
ISBN (Print)9781510619517
Publication statusPublished - 2018
EventSPIE Astronomical Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray - Austin, United States
Duration: 10 Jun 201815 Jun 2018


ConferenceSPIE Astronomical Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray
Country/TerritoryUnited States
Sponsor4D Technology Corporation, Andor Technology, Ltd., Astronomical Consultants and Equipment, Inc., Giant Magellan Telescope, SPIE


  • Coded mask imaging
  • Compact objects
  • eXTP
  • Gamma-ray bursts
  • LOFT
  • Silicon Drift Detectors
  • X-ray spectroscopy
  • X-ray timing


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