1. HiFi The high-field muon instrument at ISIS
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HiFi
The high-field muon instrument at ISIS
Provides applied longitudinal fields up to 5 Tesla
The magnet is a 5T superconducting split-pair, with high field homogeneity over the sample volume and actively compensated stray field. It has additional z-axis coils up to 400​G for small changes to the main field (for example, for sweeping through level crossing resonances) as well as 100G x- and y-axis transverse coils for calibration measurements, etc. Full vector fields are available
Application & Investigation
Energy
Ionic motion
Muon implantation
Environment
Conduction mechanisms
Photo excited spin relaxation
Functional Materials
Hydrogen dissociation
Muon trapping
Electronics/IT
Spin transport
Impurity effects
Fundamental Science
Magnetic ordering and frustration
Superconductor flux penetration
Chemistry and Catalysis
Radical structure and dynamics
Hyperfine coupling constants
Bio-Science
Radical formation
Ion conduction
Electron transfer
Why High Fields?
Higher fields can:
Extend the range of accessible fluctuations, correlations, diffusion and dynamics across a broad range of systems
Give access to new regions of magnetic phase diagrams and allow state preparation in, for example, frustrated systems
Give access to more level crossing resonances, many of which are in the 0.5 to 2T range, for spectroscopy and molecular dynamics studies;
Open up the full range of nuclei for RF-decoupling techniques
Versatile Sample Environment
HiFi offers the following sample environment equipment:
CCR (10K - 600K)
Flow cryostat (4K - 400K)
4He cryostat (1.5K - 300K)
Dilution fridge (30mk - 300K)
Reflector furnace (300K- 1500K)
3He insert 350mK - 300K (coming soon)
Oil cooled/heated (-40 to +200C) sample stage
However, it also allows for:
Gas handling
RF measurement
Liquid circulation
E-fields application
Laser induced photo-excitation
Flypast capability for small samples
Continual Improvement
improved detector stability
improved asymmetry with degraders
improved beam stability (coming soon)
Want to know more?
Muon Science Impact Brochure
(coming soon)
Above: ALC data for tert-butyl muoniated radicals formed by implanting muons into gaseous isobutene (S.Cottrell et al)