The experimental facility for the Search for Hidden Particles at the CERN SPS. (25th March 2019) - Ahdida, C.; Albanese, R.; Alexandrov, A.; Anokhina, A.; Aoki, S.; Arduini, G.; Atkin, E.; Azorskiy, N.; Back, J.J.; Bagulya, A.; Santos, F. Baaltasar Dos; Baranov, A.; et al.