Refrigeration – Gas compression – heat regeneration and expansion – e.g.,...
Reexamination Certificate
2006-01-12
2008-12-16
Doerrler, William C (Department: 3744)
Refrigeration
Gas compression, heat regeneration and expansion, e.g.,...
C062S295000
Reexamination Certificate
active
07464556
ABSTRACT:
A magnetic resonance apparatus comprising a superconducting magnet coil disposed in a cryostat, and a refrigerator for cooling same comprising a compressor (1) for compressing a working gas, and a high-pressure line (2) and a low-pressure line (3) disposed between the compressor (1) and a control valve (5), which periodically connects the high-pressure line (2) and the low-pressure line (3) to at least one connecting line (6) between the control valve (5) and a cold head (4) of the refrigerator, thereby producing pressure pulses through the switched working gas, wherein the control valve (5) and/or connecting line (6) and cold head (4) components are rigidly mechanically coupled to the cryostat, is characterized in that at least one of the above-mentioned lines (2, 3, 6) is branched on the compressor side upstream of the rigidly coupled components, and is symmetrically joined at one of the coupled components in such a manner that the pressure pulses through the working gas are vectorially compensated for at the component where the branched line is joined, thereby minimizing vibrations of the cryostat. The inventive magnetic resonance apparatus greatly reduces transmission of oscillations to the magnet coil and thereby the number and strength of artefacts in the spectra or images acquired with this magnetic resonance apparatus, to ensure high-quality magnetic resonance recordings.
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Takayuki Tomara, Toshikazu Suzuki, Tomiyoshi Haruyama, Takakazu Shintomi, Akira Yamamoto, Tomohiro Koyama, Rui Li. “Vibration analysis of cryocoolers”, Cryogenics 44 (2004) 309-317.
Bruker Biospin GmbH
Doerrler William C
Vincent Paul
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