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Description
The front-end of the European Spallation Source (ESS), comprising the ion source, low energy beam transport (LEBT), radio frequency quadrupole (RFQ), and medium energy beam transport will deliver a 62.5 mA proton beam in 2.86 ms pulses at a repetition rate of 14 Hz at 3.62 MeV beam energy for further acceleration in the normal and superconducting RF structures. The ion source and LEBT parameters are critical for the parameters of the beam, which is injected into the RFQ. In addition to the beam properties itself, reliability and lifetime are key parameters of ion source performance and need to be carefully assessed. For this purpose, a dedicated ion source and LEBT test stand is installed. In general, the test stand features components for an identical setup as the configuration in the main Linac. However, the test stand is also foreseen as a testbed for dedicated ion source and LEBT studies in settings or configurations, which are not feasible in the main machine. This paper presents an overview of the test stand design, reports on the progress of the project and gives an update about the recent milestones, including first plasma in the ion source, high voltage testing, and first beam extraction.
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