R&D toward design for a pion-production target for Mu2e-II
2021
The Mu2e experiment at Fermilab
will search for evidence of charged lepton flavor violation by observing the
conversion of a negative muon into an electron in the Coulomb field of a nucleus
without emission of neutrinos and will probe effective new-physics mass scales in
the 103 104 TeV range. One of the main parts of the Mu2e experimental setup is
its target station in which negative pions are generated in interactions of the 8 GeV
primary proton beam with a tungsten target, which will be capable of producing
2 1017 negative muons per year. Mu2e can be extended by a next generation
experiment, Mu2e-II, with a sensitivity improved by another factor of 10 or more
as enabled by the PIP-II accelerator upgrade project. PIP-II is a 250-meter-long
linac capable of accelerating a 2 mA proton beam to a kinetic energy of 800 MeV
corresponding to 1.6 MW of power. To achieve another factor of ten improvement
in sensitivity, Mu2e-II will require about 100 kW of proton beam on target,
and the added power requires a new target design. We will present our progress
in RD of a target station conceptual design for Mu2e-II, using the MARS15 and
G4beamline Monte-Carlo codes toward a selection between granular, conveyor, and
rotating cylindrical target options.
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