American Magnetics AMI Superconducting Magnets - Manual (Page 2)

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Introduction
These instructions are written to be generic and apply to most of the various types of
magnets supplied by AMI. Some sections and data may or may not apply to the
system you have purchased. It is recommended that you carefully read these
instructions prior to the installation and operation of your magnet system. If you have
purchased a magnet that is permanently installed into a cryostat, these instructions will
generally be supplemented by operating instructions provided by the cryostat
manufacturer.
Magnet Construction
AMI superconducting magnets are typically wound using conductors comprised of
many filaments of a superconducting material embedded in a copper matrix and
twisted along its axis to insure optimum performance of the superconductor. Electrical
insulation is provided by the insulation on the wire and by the epoxy between each
turn. All magnets are wet wound or vacuum impregnated with an epoxy to assure the
absence of voids and to prohibit movement of the wire.
The former on which the magnet is wound is constructed of aluminum, brass, stainless
steel, or other material as required for a particular magnet. Micarta end flanges are
typically used on the magnets to provide a rugged, insulated mounting surface. When
required, tapped brass inserts are screwed and epoxied into the end flange for
supporting the magnet. Standard mounting holes are tapped for threaded rods or
screws. Current lugs, protective diodes, and a persistent switch are typically mounted
on one end of the magnet.
AMI magnets are typically over-wrapped with a yellow cord to protect the windings
from minor shock. The end flanges are painted dark blue and each magnet is labeled
with a unique four digit serial number.
Specifications
A Magnet Specification Sheet is provided with each magnet after it has been tested at
AMI. All stated currents are nominal and may vary slightly from the cited currents in
the final magnet application. The coil constant which specifies the magnetic field
produced per ampere of current is supplied with each magnet.
Magnet Protection
All AMI magnets are designed and constructed such that in the unlikely event of a
quench at fields up to and including the rated field, damage will not occur to the
magnet. Each magnet is warranted against such damage by the standard AMI
warranty. AMI magnets are not warranted if operated above the rated field.