Cryogen Free Desktop Vibrating Sample Magnetometer (VSM) to 5 Tesla
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.
5 Tesla Desktop Cryogen Free VSM
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.
Desktop Cryogen Free VSM Magnetic field range: up to 5 Tesla Central field homogeneity: 0.1% over samples (0.01% optional) Persistent mode decay rate: 10ppm / hour (optional switch) Field Sweep rate: 0.5T/min Sample temperature range: 1) Room temperature only 2) 77K to 300K 3) up to 1000K with furnace Maximum sample size (in VSM): 8mm diameter VSM vibration amplitude: 0.5, 1, 2mm peak to peak (optically controlled) VSM vibration frequency: 15 to 25 Hz Typical Base noise (with 10 second averaging): 10-6 emu Accuracy and reproducibility: 0.5% Temperature setting period (if applicable): 5 minutes if dT is ~5K Temperature control (if applicable): 100mK @ 100K (with Lakeshore series unit)
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
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.
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
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.
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