Preface

The ninth “International Symposium on Large TPCs for Low-Energy Rare Event Detection”, took place in Paris between the 12th and 14th of December 2018 at the Institute of Astroparticle Physics (APC) campus - Paris Diderot University. The scientific program was organized in plenary sessions on the following topics with theoretical and experimental presentations: • Neutrinoless double beta decay process • Low energy neutrino physics • Dark matter searches • Axion and especially solar axion searches • Gamma-ray polarimetry • Detector R&D and future experiments Among the highlights of this issue of the conference let us underline the start of the large liquid Argon TPC prototypes at CERN, progress of the spherical detector with first results on light WIMPs, trends on muon tomography, a new large solar axion project, pico-second resolution with a gaseous detector. This progress reflects the growing importance of the field and promises a brilliant future. We wish to thank the many people who contributed to the success of the conference and especially the conveners of the sessions, who allowed for a smooth running of the meeting. We particularly acknowledge the APC management for providing the nice Buffon auditorium and infrastructure. We also thank DSM-Irfu, the University of Zaragoza and the European Research Council for their valuable support. The organizers