System Components
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3 System Components
This section describes the types and functions of the various sub-systems that are delivered
as part of our AVANCE UltraStabilized NMR systems. These include the following:
• Superconducting Magnet Components [}19].
• Console and Other System Components [}20].
• CryoProbe System (Optional) [}21].
• Other Optional Components [}23].
3.1 Superconducting Magnet Components
The superconducting magnet is a complex system producing a very strong, homogeneous,
and stable magnetic field as required for NMR. This section describes the various sub-
systems of the magnet system.
Magnet: The magnet system’s main component is a superconducting coil housed
in a cryostat. The cryostat consists of an outer vacuum enclosure, some
radiation shields and a liquid helium vessel.
The magnet uses liquid helium as cryogenic liquid. The magnet coil is
immersed in a sub-cooled liquid helium (~2 K) bath. An additional liquid
helium bath operating at a standard temperature of 4.2 K is located
above the sub-cooled helium section and is also housed in the outer
vacuum enclosure.
After the initial charging with electrical current, the magnet runs in
persistent mode. The current runs in a closed loop inside the system and
the magnet itself is no longer connected to a continuous power supply.
Pulse Tube
Cooler:
The magnet system is equipped with one cryocooler (pulse tube type).
The cold head is mounted on top of the magnet. The rotary valve is
mounted on a column right next to the magnet.
The cryocooler re-liquefies helium that has been extracted by pumping
and virtually leads to cryogen consumption free operation.
Helium
Compressor:
An oil-lubricated helium compressor is used to supply pressurized helium
gas for PTC operation. This compressor requires water cooling and
electrical power without any interruption.
Maintenance: Magnet maintenance consists of refilling the system with cryogenic fluids
at defined time intervals.
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