Abstract
The proposed European spallation neutron source (ESS) will be the leading neutron scattering research facility based on pulsed high intensity/high energy proton beams. According to the present reference design, a linear accelerator produces 1.2 ms long H − beam pulses of 1.334 GeV with a repetition rate of 50 Hz. The beam is accumulated in two rings. The stored beams are extracted in one turn resulting in a pulse of 1.3 μs duration which is delivered to one of the two liquid mercury target stations. Beams from two H − ion sources are pre-accelerated by radio frequency quadrupoles (RFQs), then combined to one beam of about 120 mA. After acceleration in a drift tube linac (DTL) to 70 MeV a coupled cavity linac (CCL) accelerates the beam to the final energy. The CCL can be realized in normal conducting or in superconducting (SC) version which is expected to result in a significant cost reduction for investment and operation.
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