The 2.0 GeV, 5 MW proton linac for the European Spallation Source, ESS, will have the capacity to accelerate additional pulses and send them to a neutrino target, providing an excellent opportunity to produce an unprecedented high performance neutrino beam, the ESS neutrino Super Beam (ESSnuSB). ESSnuSB aims at measuring, with precision, the CP violating angle at the 2nd oscillation maximum using a megaton-scale Water Cherenkov detector located a few hundred kilometres from the neutrino source. In order to comply with the acceptance of the target and horn systems that will produce the neutrino super beam, the long pulses from the linac must be compressed by about three orders of magnitude with minimal particle loss. This will be achieved through multi-turn charge-exchange injection in an accumulator, which should be able to accommodate over 2E14 protons. Several design challenges are encountered, such as space charge forces, low-loss injection with phase space painting, a reliable charge stripping system, efficient collimation, and e-p instabilities. This report focuses on the progress of the accumulator design, with multi-particle simulations of the injections procedure.
|Working Group||WG3 : Accelerator Physics|