Beam Monitors for the Commissioning of Energy Upgraded Linac

In 2009, Japan Proton Accelerator Research Complex (J-PARC) began a project to upgrade the J-PARC Linac using the annular-ring coupled structure linac cavities. The aim was to achieve a beam power of 1 MW at the exit of the downstream rapid cycling synchrotron. For the upgraded beam line, beam monitors were designed, fabricated, and laid out considering the beam commissioning strategy. This study introduces the beam monitor layout in the new beam line and the results of commissioning, which confirm appropriate functioning of the beam monitors.