Cryomagnetics'
liquid helium (wet) 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 will optimize current lead configuations
to match your experiment schedule. 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.
Dewar
High efficiency superinsulated open neck, bucket style.
Aluminum/fiberglass construction.
Evacuation valve, safety positive pressure relief
devices.
Lifting lugs.
Magnet Support Assembly/Dewar Top
Plate
Copper thermal radiation baffles.
LHe fill/vent ports.
Lifting lugs.
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.
Model LM-500 Liquid Cryogen Monitor
Bright vacuum fluorescent 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)
Adjustable constant current source.
Sensor calibration via front panel menu.
Can drive sensors up to 200cm active.
High and low setpoint control output.
RS-232 interface.
LabVIEW® drivers available.
See photo and further description at
http://www.cryomagnetics.com/lm-500.htm.
Available options installed:
Option 1: Analog Output. 0-1 Volt
Option 2: IEEE-488.2 Interface.
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.
