Vlachos, S. Alexopoulos, A. Barschel, C. Bay, A. Blanc, F. Bravin, E. Bregliozzi, G. Chritin, N. Dehning, B. Ferro-Luzzi, M. Gianì, S. Giovannozzi, M. Girard, O. Greim, R. Haefeli, G.J. Hopchev, P. Jacobsson, R. Jensen, L.K. Jones, R.J. Kain, V. Karpinski, W. Kuonen, A. Matev, R. Nakada, T. Rihl, M.N. Salustino Guimaraes, V. Schael, S. Schneider, O. Schultz von Dratzig, A. Schwering, G. Tobin, M. Veness, R. Veyrat, Q.D. Wlochal, M. Würkner, B. Xu, Z. JACoW Geneva, Switzerland 978-3-95450-192-2 10.18429/JACoW-IBIC2017-WE3AB1 English 323-329 WE3AB1 ion detector target scattering radiation Contribution to a conference proceedings 2018 2018-03 https://doi.org/10.18429/JACoW-IBIC2017-WE3AB1 http://jacow.org/ibic2017/papers/we3ab1.pdf The Beam Gas Vertex (BGV) monitor is being developed as part of the High Luminosity LHC project with the aim of providing measurements with less than 5% error on the beam size with an integration time of 5 minutes. It will be the only instrument capable of non-invasive beam size measurement throughout the LHC acceleration cycle with high intensity physics beams. A prototype BGV monitor has been installed in the LHC since 2016. Particles emerging from beam-gas interactions are recorded by 2 planes of scintillating fibre detectors. Based on vertex reconstruction of the detected tracks, this monitor allows non-invasive measurement of beam profiles with bunch-by-bunch resolution. A dedicated computer farm performs track reconstruction and event analysis on-line so that real-time beam profile measurements can be provided. Data taken in 2016 and 2017 will be presented that demonstrate the power of the method.