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Model 4G Bipolar Power Supplies for Superconducting Magnets

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Model 4G-100 100Amp Superconducting Magnet Power Supply Front

Model 4G-100 Front Panel Display

Model 4G-100 100Amp Superconducting Magnet Power Supply Rear

Model 4G-100 Rear Panel View

Model 4G-Dual 200Amp Superconducting Magnet Power Supply Front

Model 4G-Dual Front Panel Display

Model 4G-Dual 200Amp Superconducting Magnet Power Supply Rear

Model 4G-Dual Rear Panel View

Cryomagnetics is pleased to offer the Model 4G Bipolar Superconducting Magnet Power Supply. Click below for a video summary of features and operation.

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4G represents our “4th Generation” of power supplies designed from inception to be optimized for the high inductive loads present during operation of superconducting magnets. Since the late 1980’s, Cryomagnetics has refined power supply designs on a wide variety of superconducting magnets. This experience has made our Model 4G the most advanced superconducting magnet power supply available today.

All Model 4G power supplies are 4-quadrant, true bipolar systems featuring smooth sweeps through zero. All are equipped with USB, Ethernet, and IEEE-488.2 interfaces.

A full color, backlit TFT liquid crystal display clearly indicates output current, voltage, limit settings, and system status. No other superconducting magnet power supply provides such complete information to the user on the front panel.

The Model 4G is available in several configurations to fit your application.

The Model 4G series of power supplies are available in the following output ranges: Model 4G-100, featuring bipolar output of ± 100 amperes at up to 800 watts (± 10 volts up to 80 amperes, ±8 volts at 100 amperes), and, Model 4G-150, featuring bipolar output of ± 150 amperes at up to 1500 watts (±10 volts at 150 amperes).  Current settability with the Model 4G power supply is 0.1 milliamps — an order of magnitude better than the previous Model CS4 power supply offers. Stability will be ± 0.005% of Imax, or 0.1 mA, whichever is greater. A persistent switch heater (PSH) power supply is included in the Model 4G. Two PSH supplies are standard in the dual output model. Versatile programmability via five (5) customizable sweep rates allows the user to specify several different sweep rates for different current ranges of the magnet – making it possible to sweep a magnet slower in a particular range if it is more sensitive there without user intervention. A fast ramp capability up to 10 amperes/second is also included. Safety features include magnet quench detection and protection, automated ramp down of current in case of an error, input power loss, and over temperature. There are safety interlocks for persistent switch enable/disable and changing of important magnet parameters and limits. A 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.

The Model 4G-200S is a single output model with output current up to 200 amperes at 1650 watts (± 10 volts up to 165 amperes, ± 8 volts at 200 amperes). The Model 4G-Dual contains two independently operable ± 100 amperes at 800 watt power modules. The TFT LCD display will indicate output current and voltage of both supplies. Control of both supplies is easily accomplished via the front panel or via computer control.

The Model 4G-100 and 4G-200S have a SHIM option available. This option provides the capability to charge/discharge a superconducting magnet and also charge/discharge superconducting shim coils as found on NMR and ICR systems. While charging the main coil, the Model 4G-100/SHIM or Model 4G-200S/SHIM will automatically cycle each shim coil’s persistent switch heater to dump induced current.

CE-marked for European configurations. Input power is 220Vac (± 10%),50/60Hz.

Available Models

Model Number Max Current Output Max Output Voltage
4G-100 ± 100 amperes ± 10.00 volts
4G-150 ± 150 amperes ± 10.00 volts
4G-Dual TWO ± 100 amperes Modules ± 10.00 volts
4G-200S ± 200 amperes ± 10.00 volts
4G-100/SHIM* ± 100 amperes ± 10.00 volts
4G-200S/SHIM* ± 200 amperes ± 10.00 volts

* A special version of the 4G-100 or 4G-200S that has the capability of charging up to 12 different superconducting shim coils. These shim coils are used in many ICR and NMR systems. Contact the factory for further details.

Standard Features

  • Full color, backlight LCD display
  • True bipolar operation
  • 0.1 mA current settability
  • USB, Ethernet, and IEEE-488.2 computer interfaces standard
  • Intuitive menu system
  • Persistent switch heater power supply.
  • Variable ramp rate over 5 ranges 
  • CE-Marked.
  • Fully quench protected
  • LabVIEW® drivers available at no extra charge.
  • 15 feet length output cables.


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