摘要:
A supported superconducting magnet includes a superconducting magnet arranged within an outer vacuum container and a support structure bearing the weight of the superconducting magnet against a support surface. The support structure includes a tubular suspension element located between the magnet and the support surface, the tubular suspension element retaining the magnet in a fixed relative position with reference to the outer vacuum container by means of complementary interface surfaces arranged to transmit the weight of the superconducting magnet to the support structure. The tubular suspension element is arranged about a generally vertical axis, and supports a solenoidal magnet structure which is arranged about a generally horizontal axis.
摘要:
A method for controlling egress of gas from a cryogen vessel (12) housing a superconducting magnet (10). A controller (30) receives data indicative of gas pressure within the cryogen vessel; a controlled valve (40) controls the egress of cryogen gas from the cryogen vessel (12); and data is made available to the controller, indicating a state of the magnet. Egress of cryogen gas from the cryogen vessel is controlled by operation of the controlled valve (40) by the controller (30) in response to the available data indicating a state of the magnet.
摘要:
A tensioning arrangement for a suspension system comprising an elongate suspension member (2) for attachment to an element to be suspended under tension at a predetermined location relative to a support surface (10); the arrangement comprising a lever arm member (1) having a component (5) adapted to engage with and support said elongate suspension member remotely from said suspended element, wherein said lever arm member is formed with first (7) and second (6) bearing means adapted to bear respectively against first (9) and second (8) spaced-apart regions of said support surface and wherein at least said first bearing means incorporates an adjuster means (3) permitting the said arm member to be moved relative to said first region of said support surface, thereby to permit adjustment of tension in said suspension member.
摘要:
A method of producing an adsorption medium to remove at least one constituent from a feed stream. The method comprises dissolving at least one metal compound in a solvent to form a metal solution, dissolving polyacrylonitrile into the metal solution to form a PAN-metal solution, and depositing the PAN-metal solution into a quenching bath to produce the adsorption medium. The at least one constituent, such as arsenic, selenium, or antimony, is removed from the feed stream by passing the feed stream through the adsorption medium. An adsorption medium having an increased metal loading and increased capacity for arresting the at least one constituent to be removed is also disclosed. The adsorption medium includes a polyacrylonitrile matrix and at least one metal hydroxide incorporated into the polyacrylonitrile matrix.
摘要:
A cryostat comprises a cryogen vessel suspended within an outer vacuum container, the cryogen vessel is supported by an arrangement that includes at least one housing mounted on an exterior surface of the outer vacuum container and arranged to function as a floor mounting foot, for supporting weight of the cryogen vessel and the outer vacuum container, and at least two mounting points mounted within the housing(s). Each of at least two suspension elements (an upper suspension element and a lower suspension element) extends through a hole in the surface of the outer vacuum container, between the respective mounting point and a respective point on the cryogen vessel.
摘要:
A supported superconducting magnet, comprising a superconducting magnet arranged within an outer vacuum container; and a support structure bearing the weight of the superconducting magnet against a support surface. The support structure comprises a tubular suspension element located between the magnet and the support surface, said tubular suspension element retaining the magnet in a fixed relative position with reference to the outer vacuum container by means of complementary interface surfaces arranged to transmit the weight of the superconducting magnet to the support structure. The tubular suspension element is arranged about a generally vertical axis, and supports a solenoidal magnet structure which is arranged about a generally horizontal axis.
摘要:
A tensioning arrangement for a suspension system comprising an elongate suspension member (2) for attachment to an element to be suspended under tension at a predetermined location relative to a support surface (10); the arrangement comprising a lever arm member (1) having a component (5) adapted to engage with and support said elongate suspension member remotely from said suspended element, wherein said lever arm member is formed with first (7) and second (6) bearing means adapted to bear respectively against first (9) and second (8) spaced-apart regions of said support surface and wherein at least said first bearing means incorporates an adjuster means (3) permitting the said arm member to be moved relative to said first region of said support surface, thereby to permit adjustment of tension in said suspension member.
摘要:
In a magnet system for MRI imaging comprising a superconducting magnet (10) mounted within a cryogen vessel (12), apparatus is provided for controlling egress of cryogen gas from the cryogen vessel. The apparatus comprises a controlled valve (42) linking the interior of the cryogen vessel to a gas exit path; and a controller (30) arranged to control the valve. The valve is arranged such that a gas pressure in the cryogen vessel exceeding a gas pressure in the gas exit path acts on the valve to open the valve and allow venting of cryogen gas. The valve is also arranged such that a gas pressure in the cryogen vessel inferior to a gas pressure in the gas exit path acts on the valve to urge it closed, so restricting flow of gas into the cryogen vessel.
摘要:
A cryostat, comprising an outer vacuum vessel containing cryogenic equipment suspended from the outer vacuum vessel by a number of suspension rods. At least one of the suspension rods is provided with a tensioning and retaining mechanism for holding that suspension rod in tension braced against a suspension bracket). This tensioning and retaining mechanism includes a tubular rod carrier arranged, in use, to pass through a hole or slot in the suspension bracket, the rod carrier having an axial bore through which, in use, the rod may pass; a thread on its outer surface along at least part of its length; and a rod bearing surface for, in use, transmitting force to the rod. This tensioning and retaining mechanism also comprises a tensioning nut threaded onto the thread so as to, in use, brace against the suspension bracket to urge the tubular rod carrier in the direction of the rod bearing surface so as to apply tension to the rod.
摘要:
A cryostat, comprising an outer vacuum vessel containing cryogenic equipment suspended from the outer vacuum vessel by a number of suspension rods. At least one of the suspension rods is provided with a tensioning and retaining mechanism for holding that suspension rod in tension braced against a suspension bracket). This tensioning and retaining mechanism includes a tubular rod carrier arranged, in use, to pass through a hole or slot in the suspension bracket, the rod carrier having an axial bore through which, in use, the rod may pass; a thread on its outer surface along at least part of its length; and a rod bearing surface for, in use, transmitting force to the rod. This tensioning and retaining mechanism also comprises a tensioning nut threaded onto the thread so as to, in use, brace against the suspension bracket to urge the tubular rod carrier in the direction of the rod bearing surface so as to apply tension to the rod.