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The ISIS Muon Facility
Philip King
1. A brief ISIS Update2. Recent developments at ISIS Muons
• instruments• pulsed techniques • software• beamlines
3. Brief science examples4. RIKEN-RAL Muon Facility
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1. A Brief ISIS Update
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The ISIS Pulsed Neutron and Muon Source
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First target station
Second target station
Muons
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2. The ISIS Muon Instruments
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HiFi
2. The ISIS Muon Instruments
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2. Recent developments: HIFI
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• First muons in 2009• 5 T longitudinal field• 400 G longitudinal field for fast
switching• 100 G calibration fields• Temperature range: 30mK – 1000K• RF, E-fields• liquids• fly-past• 64 detectors; 50 MeV/hr standard
More on HiFi on Thursday morning
2. Recent developments: HIFI
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2. Recent developments: EMU
• New detectors, magnet, vacuum vessel and support frame in 2010
• 0.5 T LF; 100G TF
• 96 detectors; 60+ MeV/hr
• Temp range 300mk –1500K – fridge also now possible.
• Optimised ‘fly-past’ for small samples
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2. Recent developments: MuSR
• Detector array replaced ~3 yrs ago
• 0.25 T field, rotatable – TF and LF
• 30 mK – 1000 K temp range
• suits magnetism and superconductivity studies in particular
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2. Recent developments: pulsed techniques
Use of NMR methods
In-situ NMR:To study samples under conditions identical to the µSR experiment
Off-beam NMR:To test and characterise RF coils ready for experiments. In-situ NMR signal from rubber
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2. Recent developments: pulsed techniquesDevelopment of an RF insert for HiFi
Will extend the range of nuclei available for RF decoupling
1.5-400K, RF power up to 1kWCapacitors close to sample for wide tuning range
Remote RF tuning using external drive to capacitor
Non-magnetic capacitors for cryogenic operation. Four, for double resonance
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Development of Gas Cells for Muonium ChemistryALC and RFµSR measurements – a unique spectroscopic tool
Time delayed RFμSR: kinetic studies
0 2 4 6 8 10 12 14-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0.0Nitrogen - 18.6 bar
Asym
met
ry (%
)
Time (µs)
60 65 70 75 80 85 90
-0.020
-0.015
-0.010
-0.005
0.000
0.005
Data: Data1_BModel: LorentzEquation: y = y0 + (2*A/PI)*(w/(4*(x-xc)^2 + w^2))Weighting: y w = 1/(data1_c)^2
Chi^2/DoF = 0.7915R^2 = 0.99254
y0 0.00166 ±0.00051xc1 74.02147 ±0.3881w1 1.62513 ±0.37179A1 -0.05547 ±0.02226xc2 75.44457 ±0.29358w2 0.36926 ±1.76905A2 -0.00727 ±0.02888xc3 77.3237 ±0.71548w3 2.39531 ±0.70249A3 -0.06996 ±0.03386
Asym
met
ry
Field (G)
Nitrogen, 10bar - Muonium study @ 105MHz
d e m o d e m o d e m o d e m o d e m o
d e m o d e m o d e m o d e m o d e m o
d e m o d e m o d e m o d e m o d e m o
d e m o d e m o d e m o d e m o d e m o
d e m o d e m o d e m o d e m o d e m o
d e m o d e m o d e m o d e m o d e m o
Spectroscopy of paramagnetic species
2. Recent developments: pulsed techniques
See poster no. 3 by Cottrell et al
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2. Recent developments: pulsed techniques
• RF equipment control now possible through scripting
• A wide variety of other pulsed techniques available
• ISIS ‘Period card’ within the DAE allows control of multiple pulsed stimuli
• Up to 16 stimuli can be controlled at once• Very flexible definitions of period sequences possible
• Pulsed technique development supported through EC funding; collaborative with PSI
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2. Recent developments: software• Muon users increasingly expect
high levels of analysis support
• MANTID – ISIS visualisation and analysis software
• Now widely used for ISIS neutrons; SNS neutrons; ILL neutrons exploring it; other neutron facilities in Europe interested
• Provision of a suite of routines in MANTID for muon data analysis
In general – lots of overlap at ISIS between technical aspects of neutrons and muons: s’ware, DAE, detectors, SE kit, user support, etc.
See poster no. 68 by Cottrell et al
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• Primary muon beamline is ~25 years old
• Magnets are showing signs of age (leaks, shorts)
• Front-end magnets (Q1, Q2) particularly vulnerable to failure
• 3-year project to refurbish / replace all of the beamline magnets and other components
2. Ongoing developments: beamline refurbishment
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Publications from ISIS Muons 2009 – present. . . include 5 PRL, 5 Nature family, 1 Science
• Baker et al, Phys Rev Lett (2009) High-Tc materials
• Bramwell, Giblin et al, Nature (2009) Monopoles in spin ice
• Drew et al, Nature Materials (2009) Pnictide superconductors
• Eschenko et al, Phys Rev Lett (2009) H in GaAs
• Hillier et al, Phys Rev Lett (2009) Symmetry-breaking in superconductivity
• Takabayashi, Prassides et al, Science (2009) Superconductivity in fullerides
• de Vries et al, Phys Rev Lett (2010) Unconventional magnetism in perovskite structure
• Ganin, Baker, Rosseinsky, Prassides et al, Nature (2010) Fulleride superconductivity
• Coronado et al, Nature Chem (2010) Coexistence of superconductivity and magnetism
• Parker et al, Phys Rev Lett (2010) Magnetism and superconductivity in pnictides
• Pratt et al, Nature (2011) Quantum spin liquid
3. Science examples
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3. Science examples
Ganin et al, Nature (2010) Bramwell, Giblin et al, Nature (2009), Nature Physics (2011)
F Pratt, S Blundell, I Watanabe et al, Nature (2011)
Coronado, Blundell, Baker et alNature Chemistry (2010)
Drew et al, Nature Materials (2009)Eshchenko, Storchak, Cottrell,
Morenzoni, PRL (2009)
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4. The RIKEN-RAL Muon Facility
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4. The RIKEN-RAL Muon Facility: 2010
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4. The RIKEN-RAL Muon Facility
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4. The RIKEN-RAL Muon Facility: ARGUS
• General purpose µSRspectrometer
• 196 detectors; high data rate
• decay muons: pressure experiments up to 6kbar (e.g. Telling et al., P84)
• laser stimulation (e.g. Torikai et al, O9)High Pressure Laser
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4. The RIKEN-RAL Muon Facility: CHRONUS
Double layered (Iron+permalloy) shield
5 homogeneous magnets
Muon
Wide Gap ~ 160mm
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e+
Wavelength shifting fiber
samplee+
µ+
4. The RIKEN-RAL Muon Facility: CHRONUS
• New spectrometer• Open access – µSR studies under
extreme conditions• LF 0.4T, TF 0.015T• Compact, novel detector system:
o specially designed scintillators
o with wavelength-shifting fibre light guides
o direction-sensitive counterso highly segmented (606
channels) for high data rateso 16 channel multi-anode
photomultiplier tubes
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4. The RIKEN-RAL Muon Facility: Low Energy Muons
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For: • µSR surface studies• g-2 measurements
• short (10ns) muon pulse• small spot size (10mm2)• good energy resolution• good signal / noise
• 10-20 low energy muons /s• plans to increase laser
intensity – aim is 100x increase in low energy muon production
4. The RIKEN-RAL Muon Facility: Low Energy Muons
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4. The RIKEN-RAL Muon Facility: muon catalysed fusion
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Summary
ISIS proposal deadlines: 16 October, 16 April each year. See www.isis.stfc.ac.uk
UK users fully funded; some funding available for EC users and partner countries to cover T&S costs
Full support for your experiment from ISIS muon group members (+ISIS technical staff):
ISIS Muon Facility
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James Lord
Francis Pratt
Peter BakerSteve Cox
Adrian Hillier
Sean Giblin
Sean GiblinSteve Cottrell
Philip King
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ISIS Muon Training School
• 1 week of lectures / tutorials / practical use of ISIS muon instruments
• Next course: early 2012
• Fully funded for UK and European attendees
See
www.isis.stfc.ac.uk/groups/muons