Cryomagnetics offers a full line of high quality superconducting magnet systems that are cooled to 4.2K without the use of liquid cryogens, allowing one to eliminate the issues associated with handling liquid cryogens. This is very important in many areas of the world where liquid helium prices are exorbitant, or in environments where transferring liquid cryogens is difficult.
Due to the elimination of liquid cryogen reservoirs, liquid cryogen free systems are often a fraction of the size and weight of conventional, liquid-based systems. This allows placement of cryogen-free superconducting magnet systems in areas not suited for liquid-based systems. Finally, the simplicity of cryogen-free system operation is very attractive. Simply plug in the cryocooler and operate the system. Today's cryocoolers are very reliable with minimal routine maintenance.
Cryomagnetics offers cryogen-free systems based on two different cryocoolers - 4.2K Gifford-McMahon or 4.2K pulse tube.
4.2K Pulse-Tube
Pulse-tube cryorefrigerators have no moving cold parts, so vibration due the cold head is minimized. Eliminating the displacer in the cold head simplifies construction and increases reliability.
Cryomagnetics has developed
vibration-isolation options for pulse-tube cooled
systems. These options are suitable for nanoscience
applications.
Cryomagnetics manufactured the first commercially-available superconducting magnet system based on a 4.2K pulse tube in 1999. Since that time, 4.2K pulse tube systems have become increasingly popular.
4.2K GM
The 4.2K Gifford-McMahon based systems by Cryomagnetics offer the flexibility of up to 1.5 watts cooling power at 4.2K and the capability of orienting the cold head in any position. A popular configuration involves mounting the magnet system on a stand that allows rotation of the room temperature bore, allowing access in either vertical or horizontal positions.
Compressors are available in either air or water cooled.
4.2K Gifford-McMahon cryocoolers are used extensively throughout the world and enjoy an excellent reliability record.
Some examples of the liquid cryogen free systems manufactured by Cryomagnetics:
4.2K
Pulse-Tube Cooled Systems
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description)
1.5T Small Animal MRI
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3.0T High Homogeneity
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6.5T Split Pair |
9T Microscope System |
9T +/- 0.1% over a 10mm DSV
32mm Room Temperature Bore |
Split-Pair Configuration with 52mm Warm Bore.
6T in aiding mode, 3T peak-to-peak in opposing mode |
4T +/- 0.6% over a 10mm DSV
Bottom Looking Window |
9 tesla with 52mm Room Temperature Bore |
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4.2K
Gifford-McMahon (GM) Cooled Systems
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description)
Example 12T Cryogen-Free
Superconducting Magnet System Quotation
Use this example to help define your specific
needs...
4.2K Pulse-Tube Cooled Liquid Cryogen-free 12 Tesla
Superconducting Magnet System consisting of the following:
Superconducting Magnet
Solenoid configuration.
12 Tesla central field (4.2K) at approximately 90.4 amperes.
+ 0.1% central field homogeneity over a 10 mm DSV.
No persistent mode switch installed.
Fully protected against damage due to quench.
Cryostat
Vertical room temperature bore configuration.
Aluminum construction.
Evacuation valve, safety positive pressure relief devices.
3.00 inches (~ 76 mm) clear bore diameter.
High temperature superconducting current leads installed.
Electrical feedthrough for system diagnostics, 5 meter long instrumentation cable.
(4) ruthenium-oxide temperature sensors installed for system diagnostics.
Lifting lugs.
Removable legs installed, length to be determined.
Cryocooler
Low vibration, low maintenance 4.2K Pulse-Tube.
1.0W cooling capacity at 4.2K.
Water cooled compressor.
The compressor service interval is 20,000 hours. This is a simple adsorber replacement and can be performed by the customer or a Cryomagnetics’ authorized service technician.
Model TM-600 Temperature Monitor
Used to monitor temperature of the superconducting magnet system.
Bright, two line vacuum fluorescent display.
RS-232 computer interface.
Temperature displayed in Kelvin, Celsius, Fahrenheit, or expressed as a resistance.
Audible alarm (can be silenced).
Control output with high and low setpoints.
LabVIEW® drivers available at no extra charge.
Option 2: IEEE-488.2 Computer Interface installed.
Option 3: Two Sensor Readout with separate high and low controller setpoints installed. Simultaneous sensor monitoring.
Option 4: 19” Rack Mountable Cabinet installed.
Model 4G-100 Integrated
Superconducting Magnet Power System
The Model 4G-100 is a single output model with output
current up to ± 100 amperes at 800 watts (± 10 volts up
to 80 amperes, ± 8 volts at 100 amperes).
CE-Marked
4-quadrant, true bipolar systems featuring smooth sweeps
through zero.
Automatic quench detection and protection.
A full color, backlit TFT liquid crystal display clearly
indicates output current, voltage, limit settings, and
system status.
Current settability of 0.1 milliamps
Five (5) programmable sweep rate ranges.
Persistent switch heater power supply.
15 foot length output cables.
USB, IEEE-488.2, and Ethernet computer interfaces
standard.
Safety interlocks for persistent switch enable/disable
and changing of important magnet parameters and limits.
Visual confirmation of current present in leads will
alert users to be mindful of safety when operating the
power supply, even if line power is off.
Electronics Cabinet
19 inch inside width, industry-standard rack mount cabinet.
28.0 inch inside height.
Houses all quoted electronics.
Pre-wired with single 20’ length input power cable.
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