Bruker Biospin Gmbh

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Bruker Biospin Ag

Bruker Switzerland Ag

Steffen Bonn

Patrick Wikus

Gerhard Roth

Volker Niemann

Marco Strobel

Wolfgang Frantz

Michael Dumm

Michael Wagenknecht

Heinrich Harsch

A cryostat assembly with an outer container for a storage tank with a first cryogenic fluid and a coil tank for a superconducting magnet coil system. The magnet coil system is cooled by a second cryogenic fluid colder than the first cryogenic fluid, the coil tank being mechanically connected to the outer container and/or to radiation shields surrounding the coil tank via a mounting structure. Liquid helium at an operating temperature of approximately 4.2 K is the first cryogenic, fluid and helium at an operating temperature of &#x3c;3.5 K is the second cryogenic fluid in the coil tank. The mounting structure has mounting elements with thermally conductive contact points thermally coupled to heat sinks having a temperature at or below that of the storage tank, via thermal conductor elements. This ensures long times to quench if malfunctions occur.

Cryostat assembly with superconducting magnet coil system with thermal anchoring of the mounting structure

A cooling device () has a cryostat () and a cold head () of a cooling system (), and additionally includes a pivot bearing (), with which the cold head () is mounted on the cryostat () so as to be rotatable about a rotation axis (A). A connecting line () for a working gas of the cooling system () is connected to the cold head so that forces caused by the cooling system () act on the cold head () via the connecting line () at a force application point (EP) in a force application direction (ER). The force application direction (ER) is inclined by no more than 40&#xb0; with respect to the normal (N) of a lever plane (HE) which contains the rotation axis (A) and the force application point (EP).

Cooling device, comprising a cryostat and a cold head having improved decoupling to a cooling system

A cryostat arrangement has an outer jacket, a first tank with a first cryogen, and a second tank with a second liquid cryogen which boils at a higher temperature than the first cryogen. The first tank comprises a neck tube, whose hot upper end is connected to the outer jacket at ambient temperature and whose cold lower end is connected to the first tank at a cryogenic temperature. The arrangement uses a riser pipe protruding into the second tank through which the second liquid cryogen can flow out of the second tank and into a first heat exchanger in thermal contact with the neck tube. An outflow line is provided through which second cryogen evaporating from the first heat exchanger can flow out and into an optional second heat exchanger. It is thus possible to greatly reduce heat input from the neck tube into the first tank.

Cryostat with active neck tube cooling by a second cryogen

A cryostat arrangement (), with a vacuum container () and an object () to be cooled, is provided, wherein the object () to be cooled is arranged inside the vacuum container () comprising a neck tube () leading to the object () to be cooled. A closed cavity () is formed around the cooling arm () of a cold head (), wherein the cavity () in normal operation is filled at least partly with a first cryogenic fluid (), and wherein a first thermal coupling component () is provided for the thermal coupling of the first cryogenic fluid () in the cavity () to the object () to be cooled. The cryostat arrangement () further comprises a pump device (), to which the cavity () is connected, and with which the cavity () is configured to be evacuated upon failure of the cooling function of the cold head (). Various cryostat configurations are provided.

Cryostat arrangement with a vacuum container and an object to be cooled, with evacuable cavity

An arrangement for setting the spatial profile of a magnetic field in a working volume of a main field magnet (), in particular a superconducting main field magnet, of a magnetic resonance installation. The main field magnet is arranged in a cryostat () and the spatial profile is set by a passive shim apparatus () with magnetic field forming elements which are arranged within the cryostat during operation and which have cryogenic temperatures. The magnetic resonance installation contains a room temperature tube (), in which the sample volume is situated during operation. The passive shim apparatus is introduced into or removed from the cold region of the cryostat via a vacuum lock (), without needing to ventilate the cold region of the cryostat. This provides a relatively simple, cost effective, and time-efficient method to carry out a stable field homogenization using a passive shim apparatus.

Magnet and cryostat arrangement, and method for passive shimming

A connecting device in a pulse tube cooler system branches such that a first line branch () has a first flexible line segment () and a second line branch () has a second flexible line segment (), the flexible line segments being arranged in parallel with and offset from one another. The flexible line segments each have a front segment end () and a rear segment end (), the front segment end () of the first flexible line segment () and the rear segment end () of the second flexible line segment () are rigidly connected to one another, the rear segment end () of the first flexible line segment () and the front segment end () of the second flexible line segment () are rigidly connected to one another, and there is no continuous rigid connection between the control valve and the cold head.

Pulse tube cooler system with force-compensated rotary valve line

A cooling device () has a cryostat () and a cold head (), in particular, the cold head () of a pulse tube cooler. The cryostat () has a vacuum container () with a vacuum container wall (), wherein the vacuum container wall () seals off a vacuum inside the vacuum container () from the environment. A flexible sealing section () connects the vacuum container wall () directly or indirectly to the room temperature part () of the cold head (). The flexible sealing section () seals off the inside of the cryocontainer () from the environment. The cooling device further reduces mechanical coupling between the cold head and the cryostat, in particular, in order to enable performance of NMR measurements with fewer disturbances due to external vibrations.

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Zurich, Switzerland

Steffen Bonn