1. Cryogen Free Desktop Vibrating Sample Magnetometer (VSM) to 5 Tesla

2. Background Cryogenic Ltd are pioneers of Cryogen Free magnet systems.
Prior to this development high magnetic fields were only available to those with access to liquid helium.
Alternatives such as water cooled electromagnets require very large power units.
The cryogen free technology allows magnets of a wide range of fields and dimensions to be built using the same method of refrigeration.

3. 5 Tesla Desktop Cryogen Free VSM

4. Cryogen Free VSM The Basic system includes:
The superconducting magnet up to 5 Tesla
The VSM probe.
Cryocooler and compressor.
Electronics Rack housing the bipolar magnet power supply, temperature controller, thermometers, scanner and the measurement option electronics.
The computer (Pentium based with high resolution TFT screen),
including all software, I/O, IEEE and other necessary cards for measurements.
LabVIEW operating software.

5. Desktop Cryogen Free VSM
Magnetic field range: up to 5 Tesla
Central field homogeneity: % over samples (0.01% optional)
Persistent mode decay rate: ppm / hour (optional switch)
Field Sweep rate: T/min
Sample temperature range: ) Room temperature only
2) 77K to 300K
3) up to 1000K with furnace
Maximum sample size (in VSM): mm diameter
VSM vibration amplitude: , 1, 2mm peak to peak (optically controlled)
VSM vibration frequency: to 25 Hz
Typical Base noise (with 10 second averaging): emu
Accuracy and reproducibility: %
Temperature setting period (if applicable): 5 minutes if dT is ~5K
Temperature control (if applicable): 100K
(with Lakeshore series unit)

6. Desktop Cryogen Free VSM Model Range
Model No
mini-CFM-3T-51-H3
mini-CFM-5T-51-H3
Magnetic field
2 Tesla Solenoid
3 Tesla Solenoid
5 Tesla solenoid
Field direction to bore
Axial
Homogeneity in 10mm DSV
0.1%
Persistency (optional switch)
1 x 10-5 per hour
Room temperature bore
51mm bore
Cooldown 300K to operating temperature
14 hours
15 hours
18 hours
Ramp time 0 Tesla to full field
5 minutes
6 minutes
10 minutes
Operating current
<60 Amps
60 Amps

7. The Advantages of Cryogen Free Facility
Low Operating Costs as liquid helium is not required.
Ease of use as there are no cryogen transfers to make.
Independent and convenient operation
Fast Ramping capability
Automated operation
May be used in any orientation.

8. Automation
The system is installed with the National Instruments LabVIEW operating software and a standard Cryogenic applications package, which allows the complete system to be run under computer control.
This allows: 
Control of magnetic field
Fail-safe shutdown even with power failure.
Better data presentation, real data and then curve fitted data.
Full development software licence allowing the user to develop special applications

9. Optional Extras Option 2: High temperature oven insert
To perform measurements at above room temperature, an oven insert is offered which increases the standard temperature range.
In normal operation, the system has a continuous temperature range of 77K to 300K. With the oven insert this can complemented by a temperature range of 300K to 1000K.

10. Other Applications Of Cryogen free magnets.
Magneto-optical effects, EPR, ESR and NMR
Industrial applications eg; process
of industrial minerals including
China Clay and Calcium Carbonate.
Synchrotron and Gyrotron magnets
to generate X-rays and tuneable
microwave.
Medical Applications
Magnetic Resonance Imaging