title: Improved design of proton source and low energy beam transport line for European Spallation Source.
abstract: The design update of the European Spallation Source (ESS) accelerator is almost complete and the construction of the prototype of the microwave discharge ion source able to provide a proton beam current larger than 70 mA to the 3.6 MeV Radio Frequency Quadrupole (RFQ) started. The source named PS-ESS (Proton Source for ESS) was designed with a flexible magnetic system and an extraction system able to merge conservative solutions with significant advances. The ESS injector has taken advantage of recent theoretical updates and new plasma diagnostics tools developed at INFN-LNS (Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare). The design strategy considers the PS-ESS and the low energy beam transport line as a whole, where the proton beam behaves like an almost neutralized non-thermalized plasma. Innovative solutions have been used as hereinafter described. Thermo-mechanical optimization has been performed to withstand the chopped beam and the misaligned focused beam over the RFQ input collimator; the results are reported here.
authors.affiliation: Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, Via S. Sofia 62, 95123 Catania, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Neri
authors.affiliation: Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, Via S. Sofia 62, 95123 Catania, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Celona
authors.affiliation: Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, Via S. Sofia 62, 95123 Catania, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Gammino
authors.affiliation: Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, Via S. Sofia 62, 95123 Catania, Italy.
authors.forename: D
authors.initials: D
authors.lastname: Mascali
authors.affiliation: Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, Via S. Sofia 62, 95123 Catania, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Castro
authors.affiliation: Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, Via S. Sofia 62, 95123 Catania, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Torrisi
authors.affiliation: European Spallation Source ESS AB, Lund, Sweden.
authors.forename: B
authors.initials: B
authors.lastname: Cheymol
authors.affiliation: European Spallation Source ESS AB, Lund, Sweden.
authors.forename: A
authors.initials: A
authors.lastname: Ponton
authors.affiliation: Laboratori Nazionali di Legnaro, Istituto Nazionale di Fisica Nucleare, Viale dell'università 2, 35020 Legnaro, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Galatà
authors.affiliation: Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, Via S. Sofia 62, 95123 Catania, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Patti
authors.affiliation: Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, Via S. Sofia 62, 95123 Catania, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Gozzo
authors.affiliation: Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, Via S. Sofia 62, 95123 Catania, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Lega
authors.affiliation: Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, Via S. Sofia 62, 95123 Catania, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Ciavola