Liquid Cooled Superconducting Magnet Systems
Cryomagnetics’ Liquid cooled superconducting magnet systems are unmatched for reliability and high performance.
Superconducting magnet configurations include solenoids up to 20 Tesla, split-pairs up to 11 Tesla, multiple-axis, and custom designs to your specifications.
Bucket dewar configurations include top loading, bottom loading, and specialized designs. Options for belly sections (expanded LHe storage above the superconducting magnet), lambda tails, LN2-shielded, and other custom features can be incorporated. High efficiency superinsulated-only dewars give exceptional performance at an economical price.
The superconducting magnet support assembly is designed with baffling to reduce heat leak to the liquid helium bath. Safety overpressure devices are carefully chosen to insure safe operation and protect personnel in the event of a superconducting magnet quench.
Items such as lambda point refrigerators can be added to lower the superconducting magnet’s temperature to 2.2K. In superconducting magnets designed for lambda point operation, this can usually give a +2T increase in magnetic field.
To minimize liquid helium usage, Cryomagnetics’ carefully considers the materials used in the manufacture of magnet windings. Thoughtful selection of wire gauge allows for lower charging currents while maintaining a robust design. When selecting a magnet, charging current should always be considered as designs with needless current demands result in higher helium loss rates and therefore higher operating cost. In addition, the type of current lead used should match your experimental schedule to minimize helium consumption. For example, superconducting magnets used mainly in persistent mode can be provided with fixed current leads that have as little as 30mL/hour LHe boiloff in static mode. For superconducting magnets used mainly in swept mode operation, current leads can be optimized so liquid helium usage does not become excessive when high current is applied. Special high-resistance persistent switches can also be installed on these magnets to help minimize liquid helium usage during magnetic sweeps. In systems that remain in persistent mode for extended periods of time, retractable current leads may be the best solution.
Hall effect and temperature sensors can be installed on the superconducting magnet to monitor system status.
Bucket dewar systems are commonly used with variable temperature inserts, He3 inserts, and dilution refrigerators. Cryomagnetics has the manufacturing capability to provide all these options, or we can interface our equipment with your existing items. Contact us for a quotation today!
Example 9T Bucket Dewar System Quotation
Use this example to help define your specific needs…
Superconducting Magnet System consisting of the following:
Superconducting Magnet, Model 90-200-010L
Solenoid configuration with 2.0″ clear bore.
9 Tesla central field (4.2K).
11 Tesla central field (2.2K).
± 0.1% central field homogeneity over a 10 mm DSV.
Persistent mode switch installed.
Fully protected against damage due to quench.
Fully tested at 4.2K.
High efficiency superinsulated open neck, bucket style.
Evacuation valve, safety positive pressure relief devices.
Magnet Support Assembly/Dewar Top Plate
Copper thermal radiation baffles.
LHe fill/vent ports.
LN2 precool/removal tube.
Quench relief valve.
Redundant one PSI safety pressure relief valve.
B-50, 50 ampere Duty-cycle Optimized current leads.
Superconducting magnet bus bars, magnet supports.
Sample access port, with o-ring groove, o-ring, and bolt circle.
Cover plate for sample access port.
19-pin electrical feedthrough, 15 foot long instrumentation cable
Superconducting LHe level sensor installed.
240 x 400 TFT LCD display.
Simple, intuitive user interface.
Sample and hold operation. (1 minute to 99 hours settability)
Manual update or continuous operation.
Sensor de-ice cycle. (LHe only)
Sensor calibration via front panel menu.
Can drive sensors up to 200cm active.
High and low setpoint control output.
LabVIEW® drivers available.
See photo and further description www.cryomagnetics.com/products/model-lm-510-liquid-cryogen-monitor/
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).
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.
Please click on the following links for more information:
Please Contact Cryomagnetics at email@example.com or your local Sales Representative for a price quotation.
Cryomagnetics offers online ordering for electronic instrumentation:
- 4G Bipolar Power Supplies
- Liquid Cryogen Level Monitoring & Control
- Temperature Monitoring & Control
- Magnetic Field Monitoring & Control