Neri L, Celona L, Gammino S, Mascali D, Castro G, Torrisi G, Cheymol B, Ponton A, Galatà A, Patti G, Gozzo A, Lega L, Ciavola G
Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, Via S. Sofia 62, 95123 Catania, Italy.
European Spallation Source ESS AB, Lund, Sweden.
Rev Sci Instrum. 2014 Feb;85(2):02A723. doi: 10.1063/1.4832135.
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.
欧洲散裂中子源（ESS）加速器的设计更新已基本完成，能够向3.6兆电子伏特射频四极杆（RFQ）提供大于70毫安质子束流的微波放电离子源原型的建设已经启动。名为PS-ESS（ESS质子源）的离子源采用了灵活的磁体系统和能够将保守方案与重大进展相结合的引出系统进行设计。ESS注入器利用了近期的理论更新以及意大利国家核物理研究所南部分实验室（Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare）开发的新型等离子体诊断工具。设计策略将PS-ESS和低能束传输线视为一个整体，其中质子束的行为类似于几乎未被中和的非热等离子体。如下所述，采用了创新解决方案。已进行热机械优化，以承受经过RFQ输入准直器的斩波束和未对准的聚焦束；此处报告了相关结果。
