Argus technical information

Table of instrument parameters. Contact the instrument scientist for more information.

Instrument

ARGUS

Muon Beam

Positive surface muons, also positive or negative decay muons.

Range (1)

For surface muons: Mean range 100mg/cm2, spread 50mg/cm2

Pulse structure

Single or double pulse (70ns FWHM, separation 324ns), repetition rate 50Hz (with 1 of 5 repetitions missing)

Frequency response

Up to 10MHz for relaxation/rotation limited by the pulse width. RF and laser experiments can allow up to 500MHz.

Spot size (Diameter)

Set by collimator, 10-50mm

Detectors

192

Typical count rate (MEv/h)

55 (single pulse), 70 (double pulse)

Background

Constant at <10-5 of peak muon rate. Background and muon count rates equal at 25µs.

Maximum magnetic fields:

Zero field

<0.1G

Longitudinal field

3950G

Transverse field

150G

Sample environment:

He3 cryostat

300mK -> 300K

He4 cryostat

1.5K -> 300K

Flow cryostat

5K -> 300K

CCR

N/A

Furnace

Coming soon

Gas handling

N/A

Liquid handling

N/A

Radio frequency

Yes

Pressure

Up to 0.6GPa, to 1.5K (gas)

Laser stimulation

Yes

 Notes:

(1) These values are before cryostat or cell windows. 1mg/cm2 corresponds to ~1mm in water and ~0.1mm in silver.

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