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ZTKS0156 / Z31820 / Rev.: 03
Introduction
The heart of the NMR magnet system is a superconducting magnet located inside the
helium vessel, which is filled with liquid helium. The helium vessel is surrounded by a
radiation shield (RS) both cooled by a Cryogenic Refrigerator. The outer casing, the
room temperature (RT) vessel (10) contains the helium vessel and the radiation shield.
The vacuum inside the RT vessel reduces thermal conduction. RT vessel, helium
vessel, radiation shield, helium turrets, helium flow systems and the RT bore together
build the cryostat of the NMR magnet system. The RT bore (9) allows the access to the
magnetic centre of the NMR magnet system.
The cryostat is mounted on a magnet stand (8). The isolators in the magnet stand
absorb floor vibrations. Different heights and isolators are available optionally.
The helium turrets (5, 8) build the interface of the helium vessel to the outside. The
current lead turret (5) builds the interface for energizing the magnet coil and for
diagnostic. The helium fill-in turret (8) with access to the siphon and connecting plug for
the helium level sensor is used to fill the helium vessel. It is marked with a yellow label.
The helium flow system (6) connects the two helium turrets.
The Cryogenic Refrigerator is a closed loop helium expansion cycle. It consists of a
Compressor (1), two Flex Lines (2), a Remote Rotary Valve inside the Rotary Valve
Column (RVC; 3), a Cold Head (7) and a Connection Line (4) between Remote Rotary
Valve and Cold Head. The Remote Rotary Valve, Flex Lines, Connection Line and Cold
Head are covered with an applicable noise protection cover. For the Compressor a noise
protection is available optionally.
Depending on the customers site restrictions several opportunities for the additional
equipment of the Cryogenic Refrigerator are possible. Refer to the order subscription
and to the supplied manuals of the supplied equipment.
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