Title: Updated physics design of the DAEdALUS and IsoDAR coupled cyclotrons for high intensity H2+ beam production,
Abstract: The Decay-At-rest Experiment for delta-CP violation At a Laboratory for
Underground Science (DAEdALUS) and the Isotope Decay-At-Rest experiment
(IsoDAR) are proposed experiments to search for CP violation in the neutrino
sector, and "sterile" neutrinos, respectively. In order to be decisive within 5
years, the neutrino flux and, consequently, the driver beam current (produced
by chained cyclotrons) must be high. H2+ was chosen as primary beam ion in
order to reduce the electrical current and thus space charge. This has the
added advantage of allowing for stripping extraction at the exit of the
DAEdALUS Superconducting Ring Cyclotron (DSRC). The primary beam current is
higher than current cyclotrons have demonstrated which has led to a substantial
R&D effort of our collaboration in the last years. We present the results of
this research, including tests of prototypes and highly realistic beam
simulations, which led to the latest physics-based design. The presented
results suggest that it is feasible, albeit challenging, to accelerate 5 mA of
H2+ to 60 MeV/amu in a compact cyclotron and boost it to 800 MeV/amu in the
DSRC with clean extraction in both cases.