• F. Roncarolo, E. Bravin, M. Duraffourg, C. Dutriat, G.J. Focker, U. Raich, VC. Vuitton
  CERN, Geneva
• B. Cheymol
  Université Blaise Pascal, Clermont-Ferrand

As part of the CERN LHC injector chain upgrade, LINAC4 will accelerate H^- ions from 45 keV to 160 MeV. A number of wire grids and wire scanners will be used to characterize the beam transverse profile. This paper covers all monitor design aspects intended to cope with the required specifications. In particular, the overall measurement robustness, accuracy and sensitivity must be satisfied for different commissioning and operational scenarios. The physics mechanisms generating the wire signals and the wire resistance to beam induced thermal loads have been considered in order to determine the most appropriate monitor design in terms of wire material and dimensions.

• F. Roncarolo, G. Bellodi, E. Bravin, B. Dehning, M. Duraffourg, G.J. Focker, D. Gerard, E.B. Holzer, LF. Lenardon, U. Raich, L. Søby, M. Sordet, J. Tan, G. Tranquille, VC. Vuitton, C. Zamantzas
  CERN, Geneva
• B. Cheymol
  Université Blaise Pascal, Clermont-Ferrand

The CERN LINAC4 will represent the first upgrade of the LHC injection chain, by accelerating H^- ions from 45 KeV to 160 MeV for charge-exchange injection into the PS Booster. In order to provide its safe and efficient commissioning and operation, a wide variety of beam diagnostics devices has been designed for installation at convenient locations all over the accelerator length and in the transfer line to the PS Booster. This paper gives an overview of all instrumentation devices, including those to measure beam position, transverse and longitudinal profile, beam current and beam loss. The well advanced status of the system design and the main instrument features are discussed.