Wakeham, NicholasAdams, J. S.Bandler, S.Beaumont, S.Miniussi, AntoineSakai, KazuhiroSmith, Stephen J.et al2022-01-212022-01-212019-07-22http://hdl.handle.net/11603/24049J. S. Adams, S. Bandler, S. Beaumont, M-P Chang, J. A. Chervenak, A. Datesman, M. Eckart, F. Finkbeiner, J. Y. Ha, R. Hummatov, R. Kelley, C. Kilbourne, A. Antoine Miniussi, F. S. Porter, J. E. Sadleir, Kazuhiro Sakaii, Stephen J. Smith, E. J. Wassell, L. Gottardi, H. Akamatsu, B. Jackson, J. van der KuurInternational Workshop on Low Temperature Detector (LTD-18)ATHENA is a European led x-ray observatory due for launch in the early 2030s. The X-ray Integral Field Unit (X-IFU) instrument on ATHENA will have an array of 3168 TES microcalorimeters, 2.5 eV resolution (at 7 keV), 5 arc second angular resolution and a 5 arc minute field of view. As one example, will allow unprecedented views of composition and dynamics of galaxy clusters.19 pagesen-USThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.Public Domain Mark 1.0Text