American Magnetics MAxes Multi-Axis Magnet systems for Vector Fields - Manual (Page 2)

Forces in such magnets can be extremely high due to the
interaction between each coil when they are energized
simultaneously. Care must be taken to stay within the
factory defined operating envelop or one could end up
damaging the magnet and cryostat. This risk is minimized
by operating multiple coils of the MAxes
TM
system using
AMI’s Free LabVIEW virtual interface which allows the
users to specify and control the magnetic field vector from a
single computer screen. High resolution power supplies are
computer controlled using an AMI model 430 power supply
programmer. The programmer is also web enabled using an
Ethernet option. Infinite combinations of magnetic field
vectors are hence possible. Calculated field components,
based on actual current measurements and predetermined
coil constants for a given magnet, are continuously
displayed on the screen. The interface allows the users to
enter in the desired field vector of a 3-axis magnet in
Cartesian, cylindrical, or spherical coordinates (2-Axis in Cartesian or polar). Once the desired vectors are
specified in tabular format or as read from a file, a “NEXT VECTOR” control from the program initiates
appropriate control commands to the AMI power supply programmers which are connected via an RS-
232/GPIB or an Ethernet port.
MAxes
TM
MX-2 (2-axis) Vector Magnet System
Over the last few years American Magnetics has delivered wide
ranging 2-axis systems with vector fields ranging from 1T to 5T.
These have been offered for different bore sizes for use with He3
inserts and dilution fridges. American Magnetics has excellent
working relationships with various OEM’s and we work diligently to
offer customized solutions. With the advent of high power pulse tube
cryocooler technology, Cryogen free magnet systems are becoming
virtual research laboratories in various branches of condensed matter
physics. AMI offers cryogen free MAxes
TM
systems in both dry and
recondensing geometry. The picture on the left shows a conduction
cooled MAxes
TM
magnet integrated with dilution refrigerator
manufactured by Leiden Cryogenics. It is a 2-axis 3T/9T conduction
cooled magnet and offers 3T vector field with 9T in vertical plane.
Users desiring to use existing inserts that operate in liquid He may
opt for Recondensing style systems. The recondensing configuration
produces Near Zero He Boil-off systems (NZHB) and allows users to
benefit from the latest technology without investing in new and
expensive sample insert.