Improving the low-energy muon beam quality of the LEM beamline at PSI: Characterisation of ultra-thin carbon foils
arxiv(2024)
摘要
The Low-Energy Muon beamline (LEM) at the Paul Scherrer Institute currently
stands as the world's only facility providing a continuous beam of low-energy
muons with keV energies for conducting muon spin rotation experiments on a
nanometer depth scale in heterostructures and near a sample's surface. As such,
optimizing the beam quality to reach its full potential is of paramount
importance. One of the ongoing efforts is dedicated to improving the already
applied technique of single muon tagging through the detection of secondary
electrons emerging from an ultra-thin carbon foil. In this work, we present the
results from installing a thinner foil with a nominal thickness of 0.5 μ
g cm^-2 and compare its performance to that of the previously installed foil
with a nominal thickness of 2.0 μ g cm^-2. Our findings indicate improved
beam quality, characterized by smaller beam spots, reduced energy loss and
straggling of the muons, and enhanced tagging efficiency. Additionally, we
introduce a method utilizing blue laser irradiation for cleaning the carbon
foil, further improving and maintaining its characteristics
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