Cryostat configuration
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United States of America Patent
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Issued Date -
Feb 2, 2006
app pub date -
Jul 19, 2005
filing date -
Jul 30, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A cryostat configuration for keeping liquid helium comprising an outer jacket (3) surrounding a helium container (1) connected at at least two suspension tubes (2) to the outer jacket (3), wherein the helium container (1) also comprises a neck tube (5) whose upper warm end is connected to the outer jacket (3) and whose lower cold end is connected to the helium container (1) and into which a multi-stage cold head (6) of a cryocooler is installed, wherein the outer jacket (3), the helium container (1), the suspension tubes (2) and the neck tube (5) delimit an evacuated space (7), and the helium container (1) is surrounded by at least one radiation shield (4) which is connected in a heat-conducting fashion to the suspension tubes (2) and also to the neck tube (5) of the helium container (1) is characterized in that there is a direct connection (8) between the warm ends of the suspension tubes (2) and the neck tube (5) through which helium gas can flow. A cryostat configuration of this type considerably reduces or completely eliminates the heat input via the suspension tubes of an actively cryocooler-cooled NMR magnet system, as a result of which a less powerful cryocooler can be used.
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