Spécial issue : the adventures of Micromegas 2022 (n° 99) • Editorial : the legend of Micromegas, by Valérie Lapoux, p.3 • The genesis of Micromegas, Interview with one of its designers, Y. Giomataris, by F. Jeanneau and P. Manil, p.4 • The operating principle of a Micromegas, p.6 • The genealogy of Micromegas : an analysis of the lineages of ionization gas detectors, by Th. Guy and V. Bontems, p.7 • A state-of-the-art detector for COMPASS, or how Micromegas is moving out of the lab and into CERN, by F. Kunne and D. Neyret for the Compass team, p.10 • Micromegas unveils its curves with CLAS, par J. Ball, M. Garçon and S. Aune for the CLAS12 team, p.12 • Micromegas unfolds its petals and does cartwheels, NSW for ATLAS, by F. Jeanneau and Ph. Schune, p.14 • Micromegas takes neutrons on the flight, by F. Gunsing for the n_TOF team, p.16 • Low pressure detectors for S3 and NFS: with or without Micromegas? by D. Doré, A. Drouart and J. Pancin for the NFS and S3 teams, p.17 • KABES and T2K, or the art of trajectography at all scales! by E. Mazzucato for the KABES NA48 and T2K, p.18 • The 3D trajectography of nuclear reactions with the MINOS active target, by A. Delbart for the MINOS team, p.20 • The evolutions of Micromegas, segmented, resistive, bulk then GEM, by D. Neyret, F. Jeanneau and S. Procureur for the IRFU teams, p.22 • The development of microchips; InGrid reading planes (TimePix); The new Piggyback architecture; by D. Attié for the IRFU project teams, p.24 • Get out the muo device! by S. Procureur for the ScanPyramids team at IRFU, p.26 • On the hunt for rare events: Micromegas goes into “axion”, by Esther Ferrer Ribas, for the CAST and IAXO teams at IRFU, p.28 • Beyond Micromegas, a sphere to search for the hidden matter of the Universe, by Y. Giomataris, p.29 • The Micromegas glossary, dictionary, links and references, p.30 • Bibliography, books and articles, reports and patents, p.31
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