The chopping line is a critical part of the ESS linac in term of technical realisation of the choppers and preservation of the beam qualities. A new optimised design of the ESS RFQs and chopping lines is reported. The beam dynamics has been optimised with H- beam currents up to 100-mA to have safety margin with respect to the ESS goals. The first RFQ transmits almost 99.7% of the beam up to 2 MeV. The line with two choppers allows a perfect chopping between 2 bunches. The second RFQ accelerates the particles up to 5 MeV with a transmission close to 100%.
@article{arxiv.physics/0008144,
title = {Design of the Ess RFQs and Chopping Line},
author = {R. Duperrier and R. Ferdinand and P. Gros and J-M. Lagniel and N. Pichoff and D. Uriot and CEA-Saclay and DSM-DAPNIA-SEA},
journal= {arXiv preprint arXiv:physics/0008144},
year = {2007}
}