Udrea, S. Barrios Diaz, E. Chritin, N. Forck, P. Jones, O.R. Magagnin, P. Schneider, G. Tzoganis, V. Veness, R. Welsch, C.P. Zhang, H.D. JACoW Geneva, Switzerland 978-3-95450-192-2 10.18429/JACoW-IBIC2017-WEPCC08 English 359-363 WEPCC08 ion electron photon experiment proton Contribution to a conference proceedings 2018 2018-03 https://doi.org/10.18429/JACoW-IBIC2017-WEPCC08 http://jacow.org/ibic2017/papers/wepcc08.pdf A hollow electron lens is presently under study as a possible addition to the collimation system for the high luminosity upgrade of the LHC (HL-LHC), while an electron lens system is also proposed for space charge compensation in the SIS-18 synchrotron for the high intensities at the future FAIR facility. For effective operation, a precise alignment is necessary between the high energy hadron beam and the low energy electron beam. In order to achieve this, a beam diagnostics setup based on an intersecting gas sheet and the observation of beam-induced fluorescence is under development. In this contribution we give an account of the design and performance of the optical detection system and report on recent preparatory experiments performed using a laboratory gas curtain Setup.