The design of the wide field monitor for LOFT
S. Brandt (a), M. Hernanz (b), L. Alvarez (b), A. Argan (e, f), B., Artigues (b), P. Azzarello (c), D. Barret (d), E. Bozzo (c),, Budtz-J{\o}rgensen (a), R. Campana (e, f), A. Cros (d), E. del Monte (e, f),, I. Donnarumma (e, f), Y. Evangelista (e, f), M. Feroci (e, f)

TL;DR
The paper describes the design and capabilities of the Wide Field Monitor (WFM) for the LOFT mission, highlighting its role in detecting transient X-ray sources and monitoring long-term variability with high energy resolution.
Contribution
It presents the detailed design, configuration, and potential adaptability of the LOFT WFM instrument for future missions.
Findings
WFM provides over 1/3 sky coverage with coded mask cameras.
It offers energy resolution better than 500 eV.
The design is compact, modular, and adaptable for other missions.
Abstract
LOFT (Large Observatory For x-ray Timing) is one of the ESA M3 missions selected within the Cosmic Vision program in 2011 to carry out an assessment phase study and compete for a launch opportunity in 2022-2024. The phase-A studies of all M3 missions were completed at the end of 2013. LOFT is designed to carry on-board two instruments with sensitivity in the 2-50 keV range: a 10 m 2 class Large Area Detector (LAD) with a <1{\deg} collimated FoV and a wide field monitor (WFM) making use of coded masks and providing an instantaneous coverage of more than 1/3 of the sky. The prime goal of the WFM will be to detect transient sources to be observed by the LAD. However, thanks to its unique combination of a wide field of view (FoV) and energy resolution (better than 500 eV), the WFM will be also an excellent monitoring instrument to study the long term variability of many classes of X-ray…
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