초록 ▼

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 (20

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°of rotation of the cyclotron. Finally a movable floor (27) around the cyclotron is described.

대표청구항 ▼

In a superconducting cyclotron apparatus which generates a beam of high velocity particles comprising atomic particles and subparticles thereof to be directed at an object to be irradiated from spirally accelerated charged particles around a cyclotron axis which form the beam or which impinge upon a

In a superconducting cyclotron apparatus which generates a beam of high velocity particles comprising atomic particles and subparticles thereof to be directed at an object to be irradiated from spirally accelerated charged particles around a cyclotron axis which form the beam or which impinge upon a target to produce the beam and including inlet and outlet conduit means for supplying and removing liquified gas to and from a vessel around superconducting coils supplied by electrical leads inside the vessel which pass around spaced apart iron poles so as to generate a magnetic field between the poles when current is supplied to the coils and which function to produce the spirally accelerated charged particles with an oscillatory electrical field, the improvement which comprises: a Joule-Thompson effect constricted capillary tube leading to a semi-circular tube adjacent to and in heat transfer relationship with both coils and the liquified gas in the vessel, with the semi-circular tube connected to an exit tube from the vessel and cyclotron, wherein in operation of the cyclotron liquified gas is at an elevated pressure P1 in the vessel and a portion of the liquified gas in the vessel flows through the capillary tube and expands into the semi-circular tube at a pressure P2 lower than P1 thus cooling the semicircular tube and thus the liquified gas in the vessel and the coils and then the liquified gas is removed through the exit tube, and wherein the cooled semi-circular tube subcools the liquified gas in the coil vessel thus preventing the formation of bubbles in this vessel due to heat flowing into the liquified gas in the vessel along the electrical leads supplying current to the coils.