271 results about "Cryostat" patented technology

A dilution refrigerator and a method for operating same as described. The dilution refrigerator comprising a plurality of cryostats each comprising a plurality of temperature-controlled flanges inside a vacuum chamber, the temperature-controlled flanges cooled to progressively lower temperatures. Dilution units are disposed inside each of the cryostats and operable to cool at least a subset of the temperature-controlled flanges. A gas handling system is fluidly coupled to the plurality of cryostats and comprises a flow circuit and flow control devices interconnecting a gas mixture reservoir with the dilution units. A controller is coupled to the gas handling system and configured for operating the flow control devices in accordance with a sequence of operations that open and close paths in the flow circuit that allow a gas mixture to circulate between the gas mixture reservoir and the dilution units.

Systems and techniques that facilitate scalable cryostats and cryogenic systems are provided. In an embodiment, a cryogenic system can comprise a plurality of unit cells joined together, wherein each unit cell comprises: a trapezoidal-shaped frame, wherein frames from adjacent unit cells are connected in a vacuum-tight manner to form a continuous, global vacuum enclosure, and wherein the unit cells are capable of being horizontally removed from or inserted into the plurality of joined unit cells. Furthermore, each unit cell can comprise at least one temperature shell, wherein temperature shells from adjacent unit cells are connected to form a continuous, global temperature shell. Moreover, each unit cell can comprise at least one cryogenic payload located within the at least one temperature shell, that is cooled by at least one retrofitted version of a standard dilution refrigerator.

The utility model belongs to the technical field of ultralow-vibration low-temperature refrigeration, and particularly relates to a dry-type ultralow-vibration closed-cycle low-temperature liquefaction system which comprises a liquefier part, the liquefier part is connected with a low-temperature thermostat part through a low-loss liquid conveying pipe part, and the low-temperature thermostat part is connected with the liquefier part through a circulation gas circuit part. According to the dry-type ultralow-vibration closed-cycle low-temperature liquefaction system, a first-stage cold head and a second-stage cold head in a refrigerating machine are arranged to reach 40K and 4K respectively, due to the air pressure difference, high-purity helium entering the first-stage cold head for heat exchange can be subjected to heat exchange to reach 40K, then enters a second-stage cold head heat exchanger to be subjected to heat exchange to reach 3K, and then passes through a low-temperature needle valve, so that the temperature of a low-temperature thermostat is reduced to be between 2 and 3k, and therefore the heat exchange efficiency is improved. Helium subjected to heat exchange is pumped away through the circulating pump for circulation, the low-loss liquid conveying pipe is fixed, and vibration transmitted by the liquefier part can be filtered.

The application discloses a multi-model adaptive low-temperature valve sealing performance testing device and method, and belongs to the technical field of valve detection. The device comprises: a first upper end cover of a low-temperature thermostat, wherein a to-be-tested low-temperature valve is installed on the first upper end cover through a valve support device; the valve support device is in flexible sealing cooperation with a bellows through an adjusting screw, so that the installation height and centering of the to-be-tested low-temperature valve are controlled, and low-temperature valves of different specifications are adapted; the low-temperature thermostat surrounds a first cold screen and a second cold screen; the bottom of the to-be-tested low-temperature valve is connected with one end of a cold-lead bridge through a pipe clamp and is surrounded by the first cold screen; a GM refrigerating machine comprises two-stage cold heads arranged in the low-temperature thermostat; the second cold screen surrounds the two-stage cold heads; the other end of the cold-lead bridge is connected with the two-stage cold heads; three helium supply devices are connected with the inlet and outlet of the to-be-tested low-temperature valve and the low-temperature thermostat respectively; and a vacuum pump unit is connected with the low-temperature thermostat. The application realizes rapid adaptation and accurate testing of low-temperature valves of multiple models.

The invention relates to the field of particle accelerators, and provides a wire drawing device and a wire drawing method for a tension wire in a cold shield of a cryostat. The wire drawing device for the tension wire in the cold screen of the cryostat comprises a first bridging pipe, a second bridging pipe and an internal guide body, and the first bridging pipe and the second bridging pipe are inserted into the cold screen from the two opposite sides of a vacuum chamber of the cryostat respectively and connected with a tension wire instrument corresponding to the interior of the cold screen in a sleeved mode; the end, close to the second bridging pipe, of the first bridging pipe is provided with a first reducing section. Due to the fact that the inner diameter of the first reducing section is gradually increased in the direction close to the second bridging pipe, the end, close to the first bridging pipe, of the second bridging pipe can be easily inserted into the first reducing section, and the interior of the first bridging pipe and the interior of the second bridging pipe are communicated to form a wire guiding channel. Therefore, under the condition that the cover plate does not need to be opened, stable and lasting stretching of the linear reference can be rapidly achieved with high precision, the accuracy of deformation monitoring of the cryostat is ensured, and the experiment efficiency is improved.

The invention relates to a storage cryostat (2) for liquid helium (7), suitable for transferring liquid helium (7) from the storage cryostat (2) into an application cryostat (3), wherein the storage cryostat (2) comprises: - a vacuum-insulated helium vessel (6) for liquid helium (7), the helium vessel (6) having a vertical height HHB that can be filled with liquid helium (7), - a transfer line (4) for liquid helium (7), having an inlet opening (20) which opens into a lower region of the helium vessel (6), in particular into a lower fifth of the helium vessel (6), and - a convection-suppression system (9) which is arranged within the helium vessel (6) and impedes vertical convection of liquid helium (7) in the helium vessel (6), characterised in that the convection-suppression system (9) is formed in the helium vessel (6) over a height interval (IKS) with a vertical height HKS, where HKS ≥ 0.50 × HHB, and in that the convection-suppression system (9) impedes the vertical convection of liquid helium (7) in the helium vessel (6) over the region of the height interval (IKS) of the convection-suppression system (9). The invention provides a storage cryostat that enables simple and rapid transfer of liquid helium from the storage cryostat into the application cryostat, with minimised helium losses.

The utility model provides a low-temperature heat exchanger and a low-temperature thermostat. The low-temperature heat exchanger comprises a heat exchanger core, a heat exchanger shell and a cold head. The heat exchanger core is arranged in the heat exchanger shell, and the cold head is connected with the heat exchanger shell. The heat exchanger core internally comprises a first flow channel composed of a plurality of holes extending in the axial direction, and an inlet of the first flow channel is used for guiding in cooling fluid. The surface of the heat exchanger core comprises a plurality of protruding structures, the surface of the heat exchanger core and the inner surface of the heat exchanger shell form a second flow channel, and an outlet of the second flow channel is used for guiding out cooling fluid. The heat exchanger core comprises a through hole, and the through hole communicates with an outlet of the first flow channel and an inlet of the second flow channel. According to the structure of the first flow channel and the second flow channel in the low-temperature heat exchanger, the heat exchange area between the refrigerating fluid and the low-temperature heat exchanger can be increased, the heat exchange temperature difference between the refrigerating fluid and the low-temperature heat exchanger can be reduced, and the heat exchange efficiency of the low-temperature heat exchanger is improved.

The invention relates to a modularized and anti-noise variable-temperature electrical characterization test system and method, and the system comprises a vacuum pump, a cryostat, a refrigerator, a temperature controller, an electrical characterization system, and a computer. A sample table, a cold head, a heater and a temperature sensor are arranged in the cryostat; the vacuum pump is connected with the low-temperature thermostat through a vacuum pipeline and is used for adjusting the air pressure in the low-temperature thermostat; the refrigerating machine is connected with the cold head and is used for cooling the sample table; the temperature controller is used for collecting the temperature detected by the temperature sensor and controlling the heater; the computer is used for collecting data acquired by the temperature controller and the electrical characterization system and sending a control instruction to the temperature controller and the electrical characterization system; and the electrical characterization system is connected with the test sample on the sample table and is used for carrying out electrical characterization test on the test sample under modular configuration. According to the invention, the anti-noise capability in the data acquisition process can be improved.

The invention relates to a low-temperature convergent transmission spectrum measuring device based on a Fourier transform infrared spectrometer. The device comprises a Fourier transform infrared spectrometer, a convergence angle optical system, a low-temperature optical system and a receiver. The convergence angle optical system comprises a collimating lens, a diaphragm, a convergent lens group and a reflector, and the low-temperature optical system comprises a diaphragm, a sample holder and a low-temperature thermostat. The collimating lens is used for converting divergent light emitted by the infrared spectrometer into parallel light, the aperture diaphragm is used for regulating and controlling the spot size of the parallel light, the convergent lens is used for converting the parallel light into convergent light, and after the convergent light is emitted through a sample, the emergent divergent light is converted into the parallel light. Incident parallel light is reflected into a receiver in a convergent state by using an aspheric concave reflector, and the temperature of a sample is reduced to a temperature to be measured by using a cryostat. The low-temperature convergent transmission spectrum measuring device has the characteristics of simple structure, large convergent angle regulation and control range, wide spectrum band and temperature coverage range and the like.

A superconducting magnet device includes a tubular cryostat defining a central cavity therein, a first superconducting coil set and a second superconducting coil set disposed outside the central cavity and inside the tubular cryostat, and a power supply system being capable of controlling a magnitude of a first exciting current to the first superconducting coil set and a magnitude of a second exciting current to the second superconducting coil set independently of each other. The first superconducting coil set generates a magnetic field distribution, which is convex downward on an X axis and convex upward on a Y axis when the first exciting current is supplied, in the central cavity. The second superconducting coil set generates a magnetic field distribution, which is convex upward on the X axis and convex downward on the Y axis when the second exciting current is supplied, in the central cavity.

Systems and techniques for facilitating scalable cryostats and cryogenic systems are provided. In one embodiment, the cryogenic system (300) may include a plurality of unit cells (304) coupled together, wherein each unit cell includes a trapezoidal frame (704) wherein the frames from adjacent unit cells are vacuum-sealed to form a continuous global vacuum enclosure, and wherein the unit cells are horizontally removable from or inserted into the plurality of coupled unit cells. Furthermore, each unit cell may include at least one temperature housing (508, 510, 512) wherein temperature housings from adjacent unit cells are coupled to form a continuous global temperature housing. Moreover, each unit cell may include at least one cryogenic payload (514) located within at least one temperature housing, which is cooled by at least one modified version of a standard dilution refrigeration unit.

The present invention relates to a method and system for designing a magnet using an induced current, which includes: determining the field type of an external magnetic field and the coil distribution profile according to physical requirements, and determining the conductor shell shape according to the coil distribution profile; calculating the eddy current distribution generated by the conductor shell under the external magnetic field, and obtaining a preliminary discrete coil distribution after discretizing the eddy current distribution; parameter modeling of the discretized coil position, adjusting the coil distribution, and optimizing the magnetic field at the coil end; converting the magnetic field and current distribution data on the optimized coil into a Lorentz force distribution and loading it into a finite element model for structural simulation, and mechanically designing the coil skeleton and the magnet structure according to the simulation results, and after the structural design of the cold body is completed, designing a cryostat from the inside out. The present invention has no special restrictions on the field shape and the coil cross-sectional distribution, has extremely high flexibility, can cope with the design requirements of various complex magnetic field systems, and can be applied in the field of magnet optimization design technology.

Cryostat microtome, including: a main body; a cryostat arranged on and above the main body, wherein a receiving chamber is formed in the cryostat; a cutting device, located at least partially in the receiving chamber; a cooling system connected to and configured with the main body to provide a source of cold for the cryostat microtome, the cooling system includes a compressor and the compressor is a variable speed compressor.

This infrared radiation detector comprises: – a cryostat equipped with a cold finger, suitable for heat exchange with a cold source, and a window transparent to the infrared radiation to be detected; – a cold plate, mechanically fixed and in heat exchange with the cold finger; – a detection block comprising at least one detection matrix sensitive to the range of infrared wavelengths to be detected, and in heat exchange directly or indirectly with the cold plate; – a cold screen mechanically fixed and in heat exchange with the cold plate and suitable for limiting parasitic radiation, the cold screen being equipped with at least one diaphragm or baffle (9), oriented radially with respect to the general orientation of the detector, and equipped with an opening suitable for allowing the transit of the optical path resulting from the incident radiation.The free edge (13) of said at least one diaphragm or baffle (9) is structured so as to define non-linear patterns (14). Figure for the abbreviation: Fig 6.

The invention discloses a cyclotron and a superconducting magnet debugging method, and the cyclotron comprises a superconducting magnet and a first debugging segment assembly. The first debugging section assembly comprises a first connecting unit and a first connecting end, and the first connecting unit is used for being in threaded connection with a load belt of the cryostat and used for tensioning or loosening the load belt; the first connecting end is used for being detachably connected with a second debugging section assembly, and the first connecting end is used for receiving power to drive the first connecting unit to move. The cyclotron and the superconducting magnet debugging method are used for realizing flexible installation of a superconducting magnet debugging tool, and ensuring normal use of the cyclotron and proton radiotherapy effect.

The invention relates to the technical field of transfer devices, and provides a transfer device for a cryostat, which comprises a bottom bracket, a main body bracket arranged above the bottom bracket, and a damping mechanism, a suspension mechanism and a tensioning mechanism which are arranged between the bottom bracket and the main body bracket, at least the upper end of the main body bracket is provided with an opening for the cryostat to enter and exit the accommodating space; the damping mechanism is used for attenuating or isolating a vibration load between the bottom bracket and the main body bracket; the suspension mechanism comprises a suspension support detachably arranged at the upper end of the body support, a suspension assembly used for suspending the top end of the cryostat and a hoisting assembly used for being connected with hoisting equipment. The tensioning mechanism is arranged on the main body support and used for being connected with the bottom end of the cryostat so as to limit the bottom end of the cryostat from moving relative to the main body support. By means of the arrangement, the problem that in the prior art, when the cryostat is transferred, the cryostat is prone to being damaged is solved.

A therapeutic apparatus may be provided. The therapeutic apparatus may include a radiation therapy device configured to apply therapeutic radiation to a region of interest (ROI). The radiation therapy device may include an accelerator configured to accelerate electrons in an electron beam to produce a radiation beam of the therapeutic radiation, a magnetic resonance imaging (MRI) device configured to acquire MRI data with respect to the ROI. The MRI device may include an annular cryostat including at least one annular structure enclosing one or more chambers.

This invention provides a fully enclosed microfluidic pressure control system and method, relating to the fields of cryogenic metering and precision pressure control. The system includes a first cryogenic thermostat and a second cryogenic thermostat; a connecting pipe linking the gas phase spaces of the two thermostats to form a fully enclosed gas loop; a gas flow control valve located on the connecting pipe; an active temperature control unit thermally coupled to the second cryogenic thermostat; and a central control system that, based on the deviation between the actual pressure and the target pressure of the first cryogenic thermostat, controls the active temperature control unit to adjust the temperature of the second cryogenic thermostat to generate a pressure difference, and controls the opening of the gas flow control valve according to the deviation, allowing the working gas to transfer within the fully enclosed gas loop to regulate the internal pressure of the first cryogenic thermostat. This invention achieves zero-loss recycling of the working gas and is suitable for high-precision pressure control in applications such as ultra-low temperature physics experiments, quantum computing, and cryogenic thermostats.

On-chip cryostat and method, in particular for providing one or more quantum elements, comprising a substrate; a layer structure arranged on the substrate, wherein a sample, in particular a quantum element, can be arranged on a sample surface on the side of the layer structure opposite the substrate, and a vacuum housing surrounding the layer structure; wherein the layer structure comprises at least one ADR layer.

The invention discloses a non-contact current compensation method for a high-temperature superconducting electric suspension magnet. The non-contact current compensation method specifically comprises the steps that zero-flux suspension coils are installed on a ground track at equal intervals in the train running direction; the low-temperature system is composed of an outer Dewar, a radiation screen and a refrigerating machine. The vehicle-mounted superconducting magnet is directly conducted and cooled through a refrigerating machine, and the vehicle-mounted power generation coil and the vehicle-mounted excitation coil are installed on the outer side and the inner side of the outer Dewar respectively. The surface of the radiation screen is provided with a high-temperature superconducting tape, and two ends are connected with a vehicle-mounted superconducting magnet to form a closed loop. When a train runs, the vehicle-mounted superconducting magnet induces current in the suspension coil, the vehicle-mounted power generation coil generates power by using a harmonic magnetic field of the suspension coil, the vehicle-mounted excitation coil generates a traveling wave magnetic field and induces voltage on the high-temperature superconducting strip, and based on the magnetic flux quantum coupling theory, the induced voltage has a direct-current component. The vehicle-mounted superconducting magnet is excited, and attenuation of magnet current is compensated. According to the invention, efficient and stable non-contact direct current compensation of the vehicle-mounted superconducting magnet is realized.

The invention discloses a closed low-temperature heat exchange cooling table system and a cooling method, and belongs to the technical field of ultralow-temperature refrigeration, a low-temperature thermostat and a low-temperature sample table are mounted on a scanning electron microscope, an internal channel of the low-temperature thermostat is connected with the low-temperature sample table, and the low-temperature thermostat is used for regulating and controlling the temperature of helium / nitrogen entering the low-temperature sample table; the heat exchanger is contained in a heat exchange box of the low-temperature refrigerator, the interior of the heat exchange box is in a vacuum state, the heat exchanger is connected with a cold head of the low-temperature refrigerator, and a refrigerant in the cold head of the low-temperature refrigerator in the heat exchange box absorbs heat of helium / nitrogen in the heat exchanger to reduce the temperature of the helium / nitrogen in the heat exchanger; the circulating air pump is connected with an inlet of the heat exchanger through a pipeline, an outlet of the heat exchanger is connected with one end of the low-temperature thermostat internal inflow channel, and the other end of the low-temperature thermostat internal inflow channel is connected with the low-temperature sample table. And the problem of vibration of the low-temperature sample table caused by gas-liquid phase change is avoided.

Inside the vacuum enclosure (101) of a cryostat, a plurality of temperature stages form an ordered series in a primary direction. They are cooled to respective cryogenically cooled temperatures with stages (104, 106) of a staged cooling system. A first dilution refrigerator (1001) comprises a first still (109) and a first mixing chamber (110), of which said first still (109) is located on a first still flange (501) and said first mixing chamber (110) is located on a first mixing chamber flange (502). A second dilution refrigerator (1002) comprises a second still (301) and a second mixing chamber (302), of which said second still (301) is located on a second still flange (504) and said second mixing chamber (302) is located on a second mixing chamber flange (505). Said first still flange (501) is thermally separate from said second still flange (504). Said first mixing chamber flange (502) is thermally separate from said second mixing chamber flange (505). Said second dilution refrigerator (1002) is configured for a larger cooling power than said first dilution refrigerator (1001).

An apparatus, including a scanning probe microscope base that includes a configured to be secured to an end of an insert in a cryostat; a top configured to be connected to a base of a scanning probe microscope head that is configured to be disposed inside the insert; and a damping system disposed between the frame and the top and comprising a bellows that seals the end of the insert. This sealing separates an ultra-high vacuum (UHV) environment in the insert from a high vacuum (HV) environment surrounding the end of the insert and also positions an upper surface of the top in the UHV environment.

The invention relates to an infrared imaging device (1) comprising: - an imaging system (3), - a measuring system (5) comprising: -- an array of lenses (7) situated in an image plane (9) of the imaging system, and -- an array of photodetectors (11), -- a cryostat (13) configured to cool the array of photodetectors and the array of lenses, each lens (7a, 7b) being associated with a main photodetector (11a, 11b), and each lens being configured to image an exit pupil (14) of the imaging system on an area centred on the main photodetector, the device being configured either in a first configuration, in which a distance separating two centres of adjacent main photodetectors is equal to twice a dimension of a main photodetector, or in a second configuration, in which the distance separating two centres of adjacent main photodetectors is equal to three times the dimension of a main photodetector.

The present invention belongs to the technical field related to refrigeration and cryogenic containers, and discloses a eddy-current-free liquid helium cryostat for use in a pulsed high-magnetic field environment. The cryostat comprises a sample rod, a helium chamber, a liquid nitrogen layer, a vacuum chamber, and a tail pipe. The tail pipe is composed of an inner epoxy tail pipe and an outer epoxy tail pipe, each of which is mounted via metal flanges. The epoxy tail pipe and the metal flanges are bonded together with epoxy sealant. The vacuum interlayer between the helium chamber and the vacuum chamber is interconnected with the vacuum interlayer between the inner epoxy tail pipe and the outer epoxy tail pipe. In addition, the metal flange of the inner tail pipe is precisely mounted concentrically from top to bottom, and a removable metal seal is achieved between the metal flange of the inner tail pipe and the bottom flange of the helium chamber. The present invention effectively solves the problem of liquid helium loss caused by Joule heat generated by induced eddy currents in a pulsed high-magnetic field environment in the prior art, while significantly improving the measurement accuracy of scientific experiments in a high-field pulsed high-magnetic field environment.

Technologies for an optomechanical system include an intermediate plate having a top surface with multiple tapped holes arranged in a grid. A pair of dowel pin holes surround each tapped hole in a linear pattern. Multiple optical blocks are coupled to the intermediate plate using dowel pins positioned in the dowel pin holes and corresponding dowel pin holes defined in the bottom surface of the optical block. Each optical block includes multiple optical elements coupled to the top surface of the optical block with dowel pins. A cryostat may be coupled to the intermediate plate. A cryo-package assembly is mounted inside a cryo chamber of the cryostat. The cryo-package assembly includes a cryo device such as an ion trap covered by a machined copper lid. The lid includes a meandering passageway to allow for differential pumping in order to achieve ultra-high vacuum within the cryo-package assembly.

A high-speed global-shutter thermal imaging system includes a cryostat, the cryostat including a store of coolant and a detector assembly, a vacuum pump, and an output channel to a analog-to-digital converter (ADC).

Systems and techniques that facilitate scalable cryostats and cryogenic systems are provided. In an embodiment, a cryogenic system (300) can comprise a plurality of unit cells (304) joined together, wherein each unit cell comprises: a trapezoidal-shaped frame (704), wherein frames from adjacent unit cells are connected in a vacuum-tight manner to form a continuous, global vacuum enclosure, and wherein the unit cells are capable of being horizontally removed from or inserted into the plurality of joined unit cells. Furthermore, each unit cell can comprise at least one temperature shell (508, 510, 512), wherein temperature shells from adjacent unit cells are connected to form a continuous, global temperature shell. Moreover, each unit cell can comprise at least one cryogenic payload (514) located within the at least one temperature shell, that is cooled by at least one retrofitted version of a standard dilution refrigerator.

The utility model relates to a freezing slicer which comprises a machine body, a freezing chamber, a first sliding assembly, a heat absorption assembly and a freezing table. The freezing chamber is arranged in the slicing operation space; the first sliding assembly is arranged in the freezing chamber and comprises a connecting part and a sliding part, and the sliding part is in sliding fit with the connecting part; the heat absorption assembly is connected to the sliding part; the freezing table and the heat absorption assembly are oppositely arranged. The first sliding assembly is matched with the heat absorption assembly to move, so that the heat absorption assembly can cover all tissue sample areas of the freezing table, and heat absorption of large-batch tissue samples is realized.

The invention relates to a cryostat structure (30) for a magnetic resonance apparatus (10), the cryostat structure comprising: an outer vacuum chamber (42) enclosing a vacuum region (71); a heat radiation shield (33) disposed within the outer vacuum chamber (42) and configured to surround the magnet space (72); and a conduit (60) extending through a wall of the heat radiation shield (33) and fluidly connecting the magnet space (72) and a vacuum region (71) outside the heat radiation shield (33). The invention also relates to a magnetic resonance apparatus (10) comprising the cryostat structure (30) of the invention.