Argus technical information
22 Jul 2009
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Table of instrument parameters. Contact the instrument scientist for more information.

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Instrument

ARGUS

Muon Beam

Positive surface muons, also positive or negative decay muons. Up to 120 MeV/C.

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

Spot size (Diameter)

Set by collimator, 10-50 mm

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 25 µs.

Maximum magnetic fields:

Zero field

<0.1 G

Longitudinal field

3950 G

Transverse field

150 G

Sample environment:

He3 cryostat

300 mK -> 300 K

He4 cryostat

1.5 K -> 300 K

Flow cryostat

10 K -> 500 K

​Dilution refridgerator
​30 mK - 4 K​

Radio frequency

Yes

Pressure

Up to 0.6 GPa, to 1.5 K (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.

Contact: