Guidoboni, G. Allica, J.C.A. Bracco, C. Burger, S. Focker, G.J. Mikulec, B. Navarro Fernandez, A. Roncarolo, F. Søby, L. Zamantzas, C. JACoW Geneva, Switzerland 978-3-95450-192-2 10.18429/JACoW-IBIC2017-MOPWC07 English 117-120 MOPWC07 ion linac MMI instrumentation injection Contribution to a conference proceedings 2018 2018-03 https://doi.org/10.18429/JACoW-IBIC2017-MOPWC07 http://jacow.org/ibic2017/papers/mopwc07.pdf In the framework of the LHC Injector Upgrade (LIU) project, the Proton Synchrotron Booster (PSB) will be extensively modified during the Long Shutdown 2 (LS2, 2019-2020) at CERN [1]. This includes a new injector, Linac4, which will provide a 160 MeV H⁻ beam and a complete new injection section for the PSB composed essentially of a chicane and a stripping foil system. The equivalent of half of this new injection chicane, so-called Half-Sector Test (HST), was tempo-rarily installed in the Linac4 transfer line to evaluate the performance of the novel beam instrumentation, such as, stripping foils, monitoring screens, beam cur-rent transformers, H⁰/H⁻ monitor and dump, beam loss monitors, and beam position monitors. The results of the instrumentation commissioning of the HST are presented in this paper.