Veness, R. Ady, M. Chritin, N. Forck, P. Glutting, J. Jones, O.R. Kersevan, R. Marriott-Dodington, T. Mazzoni, S. Rossi, A. Salehilashkajani, A. Schneider, G. Smakulski, P. Udrea, S. Welsch, C.P. Zhang, H.D. JACoW Publishing Geneva, Switzerland 978-3-95450-201-1 10.18429/JACoW-IBIC2018-WEPB16 English 472-476 WEPB16 electron proton simulation vacuum photon Contribution to a conference proceedings 2019 2019-01 https://doi.org/10.18429/JACoW-IBIC2018-WEPB16 http://jacow.org/ibic2018/papers/wepb16.pdf High luminosity upgrades to the LHC at CERN and future energy frontier machines will require a new generation of minimally invasive profile measurement instruments. Production of a dense, focussed gas target allows beam-gas fluorescence to be exploited as an observable, giving an instrument suitable for installation even in regions of high magnetic field. This paper describes the development of a device based on these principles that would be suitable for operation in the LHC. It focusses on mechanisms for the production of a homogeneous gas curtain, the selection of an appropriate working gas and the optical fluorescence detection system.