Superconducting medical cyclotron
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United States of America Patent
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Feb 3, 1987
Grant Date -
N/A
app pub date -
Apr 26, 1984
filing date -
Apr 26, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved superconducting cyclotron (10) particularly useful for medical or therapeutic purposes is described. The vessel (105) for liquified gas surrounding superconducting coils (101, 101a) is provided with a capillary tube (200) joined to a semi-circular tube (123) leading into an exit tube (201) from the vessel which provides Joule-Thompson effect cooling upon flow of a portion of the liquified gas in the vessel into the semi-circular tube. The cooling maintains the liquified gas in the vessel in a subcooled condition to prevent boiling. The liquified gas from the exit tube can be used to cool the magnetic poles (103, 104) and then can be vented to the atmosphere or recycled. A special external magnetic yoke (102) configuration for weight reduction is described. Also described is a flexible hose (37) for supplying the liquified gas to and from the cyclotron which is mounted in a helical coil so as to allow up to a 360.degree. of rotation of the cyclotron. Finally a movable floor (27) around the cyclotron is described.
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