Instrument | EMU | HiFi | MuSR | ARGUS | CHRONUS |
Muon Beam | Surface positive muons (p=27±1MeV/c, E=3.2MeV). Polarisation > 99%. | Positive surface muons, also positive or negative decay muons. |
Range (1) | ~160mg/cm2, spread 50mg/cm2 | Surface muons: Mean range 100mg/cm2, spread 50mg/cm2 |
Pulse structure | Single pulse (70ns FWHM), repetition rate 50Hz (with 1 of 5 repetitions missing) | Single or double pulse (70ns FWHM, separation 324ns), repetition rate 50Hz (with 1 of 5 repetitions missing) |
| | | |
Full Ag Asymmetry
| 28%
| |
Frequency response | Up to 10MHz for relaxation/rotation limited by the pulse width. RF and laser experiments can allow up to 500MHz. |
Spot size (mm) (H,V) | 10-30, 10 | 10-30, 10 | 10-30, 10 | 10-50, 10-50 | 10-50, 10-50 |
Detectors | 96 | 64 | 64 | 192 | 606 |
Typical count rate (MEv/h) | 40 to 200 MeV/hour (depending on slit setting and degraders) | 55 | TBA |
Background | 1 in 10^6 of the peak rate Background and muon count rates equal at ~25µs. | TBA | TBA |
Maximum magnetic fields: |
Zero field | <0.01G | <0.1G | <0.01G | TBA | TBA |
Longitudinal field | 5000G | 50000G | 2500G | 3950G | 3950G |
Transverse field | 100G | 100G | 600G | 200G | 600G |
Sample environment: |
Dilution fridge | 30mK-300K | 30mK-300K | K-4K | Y | N |
He3 cryostat | 0.35-50K | Coming soon
| 0.35-50K | 0.35-300K | N |
He4 cryostat | 1.5-300K | 1.5-300K | 1.5-300K | 1.5-300K |
Flow Cryostat
| 5-300K | 3-400K | 3-600K | 10-300K | N |
CCR | 12-600K CCR low limit: 12 K -> 10 K | 10-600K | Returning soon | N | N |
Furnace | 300-1500K | 300-1500K | 300-1000K | Y | N |
Gas handling | Y | Y | Y | N | N |
Liquid handling | Y | Y | Y | N | N |
Radio frequency | Y | Y | Y | Y | N |
Pressure | <50 bar | <50 bar
| N | 0.6 kBar
| 0.6 kBar
|
Laser stimulation | N
| Y
| N | Y | N |
Notes:
(1) These values are before cryostat or cell windows. 100mg/cm2 corresponds to ~1mm in water, 0.4mm in silicon, and ~0.1mm in silver or copper.
The beam momentum on the south side is 28.63 MeV/c +- 0.66
MeV/c just before the beam window. After the beam window but before any SE it
is 28.2 +-0.7 (assuming the vacuum is pumped). On the sample in a HiFi CCR (after
the beam window and CCR shield) it is 28.0 +- 0.7 MeV/c (EMU will be the same.) These values are equivalent to energies of 3.81 MeV, 3.70 MeV and 3.65 MeV. The implatnation range is about 160 mg/cm2 with a spread of 50 mg/cm^2 (depending on SE, and also
on the sample material)
Please see the individual instrument manuals for more details.
