Commissioning the Beam Diagnostics Systems for the CERN Low Energy Ion Ring

Even though CERN's Large Hadron Collider (LHC) is mainly conceived to accelerate protons, a heavy ion physics program is also foreseen. In order to reach the luminosity required for LHC, the ion accelerator chain needed to be upgraded, and a central part is the new Low Energy Ion Ring (LEIR).Its role is to transform a series of long, low-intensity ion pulses from Linac-3 into short, high-density pulses which will be further accelerated in the PS and SPS rings before injection into LHC. To do so the injected pulses are stacked and phase-space cooled using electron cooling before acceleration to the ejection energy of 72 MeV/u. This note describes the different types of instruments used in the LEIR ring and transfer lines and reports on the first results obtained with O4+ and Pb54+ beams