SMOG2 installation in the LHCb cavern

LHCb is the only LHC detector that can run both in collider and fixed-target mode. The LHCb fixed-target system, called SMOG (System for Measuring the Overlap with Gas), was originally conceived for precise luminosity measurements. The SMOG system allows to inject a low flow rate of noble gas into the vacuum vessel of the LHCb VErtex LOcator (VELO) detector. SMOG2, is the use of a storage cell for the injected gas to be installed upstream of the VELO detector. The main advantage of the proposed system is to increase by up to two orders of magnitude the effective target areal density, thus resulting in a significant increase of the luminosity for fixed-target collisions.