Speaker
Description
The commissioning of the European Spallation Source (ESS) linac has started and that marks another important step towards the completion of the most powerful proton driver in the world with 5 MW of average beam power on target. Such impressive beam power could also be used for particle physics experiments at the intensity frontier. In particular, the ESS based super-beam project ESSnuSB plans to use the ESS linac as a driver for a long baseline neutrino oscillation experiment to measure, with precision, the charge-parity violation phase.
In order not to interfere with the neutron production, the ESSnuSB will increase the beam duty cycle of the linac from 4% to 8% by accelerating pulses of H$^-$ ions interleaved with the proton pulses used for neutron production. Each H$^-$ pulse will be extracted at the end of the linac in four batches, transported to a 384 m circumference storage ring, where the batches will be accumulated over 600 turns and then extracted in a single turn. In this way, we form highly compressed 1.2 ${\rm \mu s}$ pulses carrying almost 90 kJ each. On average, another 5 MW of beam power will be used for producing the neutrino super beam.
We present the design and expected performance of the accumulator ring with details on the charge-exchange injection, the fast extraction, the two-stage collimation and the RF systems.
| Working group | WG3 |
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