BEAM DIAGNOSTICS FOR THE ESS

Abstract The European Spallation Source (ESS) is a based on a 2.5GeV superconducting LINAC, producing a 5MW beam. Since it is optimized for cold neutrons, there is no accumulator ring, and hence no need for charge exchange injection. Therefore, unlike most other proposed MWclass LINACs, the ESS LINAC will accelerate protons rather than H-ions. This poses a particular challenge for beam size measurements in the superconducting section. This paper discusses the ESS beam diagnostics requirements, along with some possible instrument design options