Diagnostic Lines for the 160 MeV H Linac4 at CERN

Linac4 will be the new linear accelerator of the CERN accelerator chain delivering H- ions at 160 MeV from 2016. The increased injection energy compared to the 50 MeV of its predecessor Linac2, combined with a H- charge-exchange injection, will pave the way to reach ultimate goals for the LHC luminosity. Extensive commissioning of Linac4 is planned for the coming years. For this purpose, the beam will be studied after the exit of Linac4 in a straight line ending at the Linac4 dump, equipped with various beam instruments. An almost 180 m long transfer line will guide the beam to the charge-exchange injection point at the entry of the Proton Synchrotron Booster (PSB). About 50 m upstream of this point, two measurement lines will be upgraded to perform transverse emittance measurements as well as energy and energy spread measurements of the Linac4 beam. A detailed description of the beam measurement principles and setups at these three Linac4 diagnostics lines related to distinct Linac4 commissioning phases will be given.