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Hosting Legal Entity
Paul Scherrer Institute
Reaktorstrasse, Paul Scherrer Institut, Villigen, PO: 5232 (Switzerland)
Type Of RI
Coordinating Country
Current Status:
Operational since 1989
Scientific Description
The Swiss muon source – powered by the PSI 590 MeV cyclotron with a proton current of 2200 μA – is the world’s most intense continuous beam muon source. The proton beam hits two graphite targets. Attached to those are seven beamlines for muon (or pion) extraction, one of them is equipped with superconducting decay channel. The available muon energies range from 0.5 keV to 60 MeV. The main advantage of continuous muon beams is the detection of individual muons by fast-timing scintillation counters, easily providing nanosecond or better time resolution of the muon response. This allows one to extend μSR studies to much higher muon-spin precession frequencies (in the GHz range, corresponding to magnetic fields of more than 10 Tesla) and shorter muon-spin relaxation times compared to pulsed muon sources, where the time resolution is limited by the muon pulse duration (typically 50 ns). Thus, at the European level, the PSI SμS facility perfectly complements the ISIS pulsed muon source.

RI Keywords
Spectroscopy, Spin, Low energy muons, Muons, PSI
RI Category
Intense Neutron Sources
Scientific Domain
Engineering and Energy
Chemistry and Material Sciences
Physics, Astronomy, Astrophysics and Mathematics
Earth and Environmental Sciences
Information Science and Technology
ESFRI Domain
Physical Sciences and Engineering
Local support

PSI staff members support the users before, during and after their experiments at PSI.

Installations for muon spin spectroscopy

Various instruments dedicated to muon spin spectroscopy and the respective sample environment devices are available.

Access Type
Physical, Remote
Access Mode
Excellence Driven
Number of Users
Number Year
169 2017
Users Definition
User Demographics
European Users - 40.0% in 2017
Extra-European Users - 20.0% in 2017
National Users - 40.0% in 2017
Type of Users
Academic - 98.0%
Industry/private companies - 2.0%
Science and Innovation with Neutrons in Europe in 2020
Date of last update: 09/03/2018
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