Speaker
Description
The LEnuSTORM (low-energy neutrinos from stored muons) is a proposed facility that enhances the performance of the ESSnuSB* (European Spallation Source Neutrino Super Beam) project by measuring neutrino cross sections in the energy range 200-600\,MeV, where data is largely missing. The facility utilizes a 1.25\,MW proton beam from the European Spallation Source linac, which is compressed in an accumulator into 1.2\,µs pulses and directed at a granular titanium target embedded in a horn. Pions collected by the horn are transferred and injected into a racetrack-shaped storage ring where they decay and emit muons that will be stored in the ring for a few tens of turns. The neutrinos emitted in the muon decay in one of the straight sections will travel to a water Cherenkov detector, where the interactions are monitored.
At LEnuSTORM, the beam is large and very divergent, and thus difficult to contain. The ring design presented in this paper uses iron-dominated magnets to reduce complexity, and a compact FODO lattice with strong focusing to maximize neutrino production by allowing a large transverse acceptance. However, the design pushes fringe-field effects beyond the linear regime and requires a paraxial expansion with higher-order terms, introducing resonances and reduced dynamic aperture. We present here a design that aims at balancing the transverse and momentum acceptance with the dynamic aperture, to maximise neutrino production.
Footnotes
*https://essnusb.eu/
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