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51. 发明授权

US4682134A Conical, unimpregnated winding for MR magnets 失效
标题翻译：圆锥形，未浸渍的MR磁体绕组
公开(公告)号：US4682134A
公开(公告)日：1987-07-21
申请号：US740921
申请日：1985-06-03
申请人： Evangelos T. Laskaris
发明人： Evangelos T. Laskaris
IPC分类号： G01R33/381 , A61B5/055 , A61B10/00 , G01R33/20 , H01F6/00 , H01F6/06 , H01F7/22
CPC分类号： H01F6/00 , G01R33/381 , H01F6/06 , Y10S336/01 , Y10S505/879
摘要： An unimpregnated winding for use in a cryostat of a superconducting magnet is provided comprising a form including a shell having the shape of two truncated cones attached to one another at their respective bases. Superconducting wire is wrapped around the form under tension so that during superconducting magnet operation, the form remains under compression.
摘要翻译：提供用于超导磁体的低温恒温器的未浸渍的绕组，其包括包括在其各自的基部处彼此附接的具有两个截头圆锥形状的壳体的形式。超导线材在张力下缠绕形式，使得在超导磁体操作期间，该形式保持在压缩状态。

52. 发明授权

US4635450A Compact retractable cryogenic leads 失效
标题翻译：紧凑型可伸缩低温引线
公开(公告)号：US4635450A
公开(公告)日：1987-01-13
申请号：US826049
申请日：1986-02-04
申请人： Evangelos T. Laskaris
发明人： Evangelos T. Laskaris
IPC分类号： F17C13/00 , H01F6/06 , F25B19/00
CPC分类号： H01F6/065 , Y10S505/892
摘要： Retractable cryogenic leads for superconducting magnets are provide for making low resistance contacts at liquid helium temperature reliably in the presence of heavy frost. A tube defining a bayonet socket on one end extends through a vertical stack cover of a cryostat insert to engage and disengage a vertical terminal rod having a transverse pin. A copper rod is slidably mounted inside the tube and is vertically displaced relative to the tube by a nut rotatably mounted on the other end of the tube and threadingly engaged with the copper rod. The end of the copper rod can be forced against the top of the vertical terminal rod at high pressure after the bayonet socket engages the pin of the vertical terminal rod.
摘要翻译：提供用于超导磁体的伸缩低温引线用于在存在严重的结霜的情况下可靠地在液氦温度下制造低电阻接触。在一端限定卡口式插座的管道延伸穿过低温恒温器插入件的垂直堆叠盖以接合和分离具有横向销的垂直端子杆。铜杆可滑动地安装在管内并且通过可旋转地安装在管的另一端并与铜杆螺纹接合的螺母相对于管垂直移位。在卡口插座接合垂直端子杆的销之后，铜杆的端部可以在高压下被迫靠在垂直端子杆的顶部。

53. 发明授权

US4633682A Horizontal cryostat insert with a vertical service stack 失效
标题翻译：卧式低温恒温器插件，带垂直服务堆
公开(公告)号：US4633682A
公开(公告)日：1987-01-06
申请号：US826058
申请日：1986-02-04
申请人： Evangelos T. Laskaris
发明人： Evangelos T. Laskaris
IPC分类号： F17C3/08 , F17C13/00 , F25B19/00
CPC分类号： F17C3/085 , F17C2221/014 , F17C2221/017 , F17C2270/0536 , Y10S505/892
摘要： The insert has a horizontal vacuum jacketed, vapor cooled tube that fits in the cryostat penetration tube. The insert is equipped with a vertical service stack to access cryogenic leads of the cryostat magnet as well as a slanted transfer line to supply liquid helium or couple the insert to a liquifier. Internal radiation shields of the insert are heat stationed to thermal stations of the horizontal vapor cooled tube and the internal shields are also heat stationed to a vapor cooled tube in the vertical stack. A burst disk is provided near the top of the vertical stack as a pressure relief device.
摘要翻译：插入件具有水平的真空夹套蒸汽冷却管，其适合于低温恒温器穿透管。该插入件配备有垂直服务堆叠以访问低温恒温器磁体的低温引线以及倾斜的输送管线以供应液体氦或将插入物连接到液化器。插入件的内部辐射屏蔽件被加热到水平蒸汽冷却管的热站，并且内部屏蔽件也被加热到垂直堆叠中的蒸气冷却管。在垂直堆叠的顶部附近设置爆破盘作为压力释放装置。

54. 发明授权

US4586017A Persistent current switch for high energy superconductive solenoids 失效
标题翻译：用于高能超导螺线管的持续电流开关
公开(公告)号：US4586017A
公开(公告)日：1986-04-29
申请号：US530925
申请日：1983-09-12
申请人： Evangelos T. Laskaris , Donald W. Jones
发明人： Evangelos T. Laskaris , Donald W. Jones
IPC分类号： H01L39/20 , H01L43/00
CPC分类号： H01L39/20 , Y10S505/882
摘要： Electrical switches used in conjunction with high energy superconductive windings must be able to quickly absorb large amounts of electrical energy since switching of the superconducting current is accomplished by means of transition to the resistive state in the switch portion of the superconducting current loop. Furthermore, to minimize the heat generated during the transition to the resistive state, the switch itself should exhibit a relatively high resistance while at the same time exhibiting a low external magnetic field. The switch should also exhibit minimal stray magnetic fields, especially in those applications requiring field uniformity. These objectives are achieved in a persistent current switch which includes a length of superconductive material disposed in a compact, thermally insulated volume which also includes a mechanism for heating at least a portion of the superconductive conductor in the switch in order to return it to its resistive state. Furthermore, there is included a mass of thermally conductive material within the volume which is in thermal contact with at least a substantial portion of the superconductive conductor to mitigate the effects of hot spots occuring within the switch.
摘要翻译：与高能超导绕组结合使用的电开关必须能够快速吸收大量的电能，因为通过在超导电流回路的开关部分中转变为电阻状态来实现超导电流的切换。此外，为了最小化在向电阻状态转变期间产生的热量，开关本身应呈现相对较高的电阻，同时呈现低的外部磁场。开关还应该具有最小的杂散磁场，特别是在需要场均匀性的应用中。这些目的是在持续电流开关中实现的，其包括设置在紧凑的隔热体积中的一段超导材料，其还包括用于加热开关中的超导导体的至少一部分以将其返回到其电阻州。此外，在体积内包括大量导热材料，其与至少大部分超导导体热接触以减轻开关内发生的热点的影响。

55. 发明授权

US3991587A Method of supplying cryogenic fluid through a transfer joint employing a stepped bayonet relative-motion gap 失效
标题翻译：通过使用阶梯式卡口相对运动间隙的转移接头供应低温流体的方法
公开(公告)号：US3991587A
公开(公告)日：1976-11-16
申请号：US662103
申请日：1976-02-27
申请人： Evangelos T. Laskaris
发明人： Evangelos T. Laskaris
IPC分类号： F16L59/065 , F16L59/18 , F17C13/00 , H02K55/04 , F17C7/02
CPC分类号： H02K55/04 , F16L59/065 , F16L59/185 , Y02E40/625 , Y10S285/904 , Y10S505/897
摘要： Cryogenic liquid coolant is transferred from a stationary liquefier through a bayonet to a conduit rotating with the rotor of a superconducting generator, using a cryogenic fluid transfer joint attached to the collector end of the rotor. A relative-motion gap about the bayonet has its inner and outer diameters reduced in size near the outlet end of the bayonet. The gap thus stepped downward in size extends into a core of boil-off coolant within the rotating conduit, preventing liquid coolant centrifugally forced against the inside of the conduit from entering the gap, and allowing only boil-off coolant to enter.
摘要翻译：低温液体冷却剂通过连接到转子收集端的低温流体传递接头从静止液化器通过卡口转移到与超导发生器的转子一起旋转的导管。围绕卡口的相对运动间隙的内径和外径在卡口的出口端附近的尺寸减小。因此，尺寸向下延伸的间隙延伸到旋转管道内的蒸发冷却剂芯体中，防止离心力地压迫导管内部的液体冷却剂进入间隙，并且仅允许冷却剂冷却剂进入。

56. 发明授权

US06429761B2 Mold for bonding MRI pole piece tiles and method of making the mold 有权
标题翻译：用于粘结MRI极片的模具和制造模具的方法
公开(公告)号：US06429761B2
公开(公告)日：2002-08-06
申请号：US09738838
申请日：2000-12-18
申请人： Evangelos T. Laskaris , William D. Barber , Johannes M van Oort , Bulent Aksel , Paul S. Thompson , Michele D. Ogle
发明人： Evangelos T. Laskaris , William D. Barber , Johannes M van Oort , Bulent Aksel , Paul S. Thompson , Michele D. Ogle
IPC分类号： H01F500
CPC分类号： H01F7/0278 , G01R33/383 , Y10S29/001 , Y10T29/4902 , Y10T29/49075 , Y10T29/49078
摘要： A laminate tile pole piece for an MRI, a method and a mold for manufacturing laminate tile metal pole pieces for an MRI. Each laminate tile has a trapezoidal or annular sector shape. The trapezoidal shape allows the tiles to be attached side by side to form a multiple concentric annular array pole piece without using oddly shaped edge filler tiles needed to fill a circular pole piece with square tiles. The pole piece is made by placing a plurality of tiles into a mold and filling the mold with an adhesive substance to bind the plurality of tiles into a unitary tile body. The unitary tile body is then removed from the mold and attached to a pole piece base to form the pole piece. The mold cavity surface preferably has a non-uniform contour. The bottom surface of the unitary tile body forms a substantially inverse contour of the mold cavity surface contour.
摘要翻译：用于MRI的叠层瓦片极片，用于制造用于MRI的层压瓦片金属极片的方法和模具。每个层压砖具有梯形或环形扇形。梯形形状允许瓦片并排连接以形成多个同心环形阵列极片，而不使用填充具有方形瓦片的圆形极片所需的奇怪形状的边缘填充瓦。极片通过将多个瓦片放置在模具中并用粘合剂物质填充模具来制造，以将多个瓦片粘合成整体瓦片体。然后将单一瓦片体从模具中取出并附接到极片基座以形成极片。模腔表面优选具有不均匀的轮廓。整体瓦片体的底面形成模腔表面轮廓的基本上相反的轮廓。

57. 发明授权

US06259252B1 Laminate tile pole piece for an MRI, a method manufacturing the pole piece and a mold bonding pole piece tiles 失效
标题翻译：用于MRI的层叠瓦片极片，制造极片的方法和模具接合极片瓦片
公开(公告)号：US06259252B1
公开(公告)日：2001-07-10
申请号：US09198507
申请日：1998-11-24
申请人： Evangelos T. Laskaris , William D. Barber , Johannes M van Oort , Bulent Aksel , Paul S. Thompson , Michele D. Ogle
发明人： Evangelos T. Laskaris , William D. Barber , Johannes M van Oort , Bulent Aksel , Paul S. Thompson , Michele D. Ogle
IPC分类号： G01V300
CPC分类号： H01F7/0278 , G01R33/383 , Y10S29/001 , Y10T29/4902 , Y10T29/49075 , Y10T29/49078
摘要： A laminate tile pole piece for an MRI. Each laminate tile has a trapezoidal or annular sector shape. The trapezoidal shape allows the tiles to be attached side by side to form a multiple concentric annular array pole piece without using oddly shaped edge filler tiles needed to fill a circular pole piece with square tiles. The pole piece is made by placing a plurality of tiles into a mold and filling the mold with an adhesive substance to bind the plurality of tiles into a unitary tile body. The unitary tile body is then removed from the mold and attached to a pole piece base to form the pole piece. The mold cavity surface preferably has a non-uniform contour. The bottom surface of the unitary tile body forms a substantially inverse contour of the mold cavity surface contour.
摘要翻译：用于MRI的层压瓦片极片。每个层压砖具有梯形或环形扇形。梯形形状允许瓦片并排连接以形成多个同心环形阵列极片，而不使用填充具有方形瓦片的圆形极片所需的奇怪形状的边缘填充瓦。极片通过将多个瓦片放置在模具中并用粘合剂物质填充模具来制造，以将多个瓦片粘合成整体瓦片体。然后将单一瓦片体从模具中取出并附接到极片基座以形成极片。模腔表面优选具有不均匀的轮廓。整体瓦片体的底面形成模腔表面轮廓的基本上相反的轮廓。

58. 发明授权

US5446433A Superconducting magnet having a shock-resistant support structure 失效
标题翻译：具有抗冲击支撑结构的超导磁体
公开(公告)号：US5446433A
公开(公告)日：1995-08-29
申请号：US309700
申请日：1994-09-21
申请人： Evangelos T. Laskaris , Constantinos Minas , Robert A. Ackermann
发明人： Evangelos T. Laskaris , Constantinos Minas , Robert A. Ackermann
IPC分类号： F17C13/00 , F25D19/00 , G01R33/38 , G01R33/3815 , H01F6/04 , H01F7/22
CPC分类号： H01F6/04 , G01R33/3815 , F25D19/006 , G01R33/3802 , Y10S505/898
摘要： A superconductive magnet having a superconductive coil located within a thermal shield located within a vacuum enclosure. A cryocooler coldhead's first stage is in solid-conductive thermal contact with the thermal shield, and its second stage is in solid-conductive thermal contact with the superconductive coil. A magnet re-entrant support assembly includes an outer support cylinder located between the vacuum enclosure and the thermal shield and includes an inner support cylinder located between the thermal shield and the superconductive coil. The outer support cylinder's first end is rigidly connected to the vacuum enclosure, and its second end is rigidly connected to the thermal shield. The inner support cylinder's first terminus is rigidly connected to the thermal shield near the outer support cylinder's second end, and its second terminus is located longitudinally between the outer support cylinder's first and second ends and is rigidly connected to the superconductive coil.
摘要翻译：一种超导磁体，其具有位于真空外壳内的热屏蔽内的超导线圈。冷冻机冷头的第一阶段是与热屏蔽件进行导电热接触，其第二阶段与超导线圈进行固体导电热接触。磁体入口支撑组件包括位于真空外壳和热屏蔽之间的外部支撑筒，并且包括位于热屏蔽和超导线圈之间的内部支撑圆柱体。外部支撑筒的第一端刚性连接到真空外壳，其第二端刚性连接到热屏蔽。内支撑筒的第一端在外支撑筒的第二端附近刚性地连接到热屏蔽，并且其第二端位于外支撑筒的第一和第二端之间的纵向位置，并且刚性地连接到超导线圈。

59. 发明授权

US5436607A Open (non-enclosed) magnets for magnetic resonance imaging 失效
标题翻译：用于磁共振成像的开放（非封闭）磁体
公开(公告)号：US5436607A
公开(公告)日：1995-07-25
申请号：US273581
申请日：1994-07-11
申请人： Madabushi V. Chari , Evangelos T. Laskaris , Gary Bedrosian , Michele D. Ogle
发明人： Madabushi V. Chari , Evangelos T. Laskaris , Gary Bedrosian , Michele D. Ogle
IPC分类号： A61B5/055 , G01R33/38 , G01R33/3815 , G01R33/383 , H01F6/00 , H01F6/04 , H01F7/02 , H01F7/20 , H01F1/00
CPC分类号： G01R33/3806 , G01R33/3815 , G01R33/383
摘要： An open magnet having two magnet assemblies arranged in a spaced-apart, parallel relationship to define a working space therebetween is provided for magnetic resonance imaging. Each assembly has an annular superconductive coil and a ferromagnetic field enhancer encircled by the superconductive coil. The field enhancers are substantially cylindrical ferromagnetic pole pieces which are encircled by a respective one of the superconductive coils. The magnet assemblies are attached to a C-shaped support frame which is rotatively mounted to a pedestal member. The frame can thus be rotated between vertical and horizontal imaging positions. The field enhancers are shaped so as to maximize homogeneity in the imaging volume while keeping their weight and volume to a minimum. The specific shape of the field enhancers is determined with a nonlinear optimization design method.
摘要翻译：具有两个磁体组件的开放磁体，其设置成间隔开的平行关系以限定其间的工作空间用于磁共振成像。每个组件具有由超导线圈包围的环形超导线圈和铁磁场增强器。场增强器是由相应的一个超导线圈包围的大致圆柱形铁磁极片。磁体组件附接到C形支撑框架，其被可旋转地安装到基座构件上。因此，框架可以在垂直和水平成像位置之间旋转。场增强器被成形为使得成像体积中的均匀性最大化，同时将它们的重量和体积保持在最小。用非线性优化设计方法确定场增强器的具体形状。

60. 发明授权

US5410286A Quench-protected, refrigerated superconducting magnet 失效
标题翻译：淬火保护的冷冻超导磁体
公开(公告)号：US5410286A
公开(公告)日：1995-04-25
申请号：US201964
申请日：1994-02-25
申请人： Kenneth G. Herd , Evangelos T. Laskaris
发明人： Kenneth G. Herd , Evangelos T. Laskaris
IPC分类号： F17C13/00 , F25D29/00 , G01R33/3815 , H01F6/04 , H01F1/00 , F25B19/00
CPC分类号： H01F6/04 , F25D29/001 , G01R33/3815
摘要： A superconducting magnet including a superconducting coil assembly having a magnet cartridge, a cryocooler coldhead having a cold stage in thermal contact with the magnet cartridge, and a thermal buffer assembly. The thermal buffer assembly includes an inlet tube and an outlet tube each having an end connected to a helium pressure container which is placed in thermal contact with the magnet cartridge. A first gas pressure regulator on the inlet tube supplies helium gas and a second gas pressure regulator on the outlet tube vents helium gas so as to maintain a generally constant pressure for the helium gas within the helium pressure container. The high specific heat per unit volume of the pressurized gaseous helium acts as a thermal buffer to extend the time the magnet can operate superconductively without the cryocooler before quenching, such as during an electric power outage.
摘要翻译：一种超导磁体，包括具有磁体盒的超导线圈组件，具有与磁体盒热接触的冷阶段的冷却器冷头以及热缓冲组件。热缓冲器组件包括入口管和出口管，每个入口管和出口管的端部连接到与磁体盒热接触的氦压力容器。入口管上的第一气体压力调节器供应氦气，出口管上的第二气体压力调节器排出氦气，以保持氦压力容器内氦气的大致恒定的压力。加压气态氦的每单位体积的高比热作为热缓冲器，以延长磁体在淬火之前超导的时间，而不需要冷却器，例如在停电期间。

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