30 results about "Superconducting radio frequency" patented technology

A superconducting quantum interference devices (SQUID) comprises a superconducting inductive loop with at least two Josephson junction, whereby a magnetic flux coupled into the inductive loop produces a modulated response up through radio frequencies. Series and parallel arrays of SQUIDs can increase the dynamic range, output, and linearity, while maintaining bandwidth. Several approaches to achieving a linear triangle-wave transfer function are presented, including harmonic superposition of SQUID cells, differential serial arrays with magnetic frustration, and a novel bi-SQUID cell comprised of a nonlinear Josephson inductance shunting the linear coupling inductance. Total harmonic distortion of less than −120 dB can be achieved in optimum cases.

Niobium or its alloy based Superconducting Radio Frequency (SCRF) Cavities involving atleast one laser beam welded components in the SCRF cavity welded from inside surface of the wall of cavity directed to achieving more than half the thickness to full depth penetration with minimum HAZ, minimizing distortion and shrinkage. The method ensures improved weld quality and surface finish substantially free of any weld defects. Also disclosed is the welding nozzle system and welding rigs adapted to facilitate such laser welding of the Niobium or its alloy based Superconducting Radio Frequency (SCRF) Cavities. The invention is thus directed to enhancing productivity, ensuring consistent quality and reliability, enhanced weld penetration with minimum HAZ, smooth finish of weld joints at possible reduced costs.

To provide a manufacturing method of a superconducting radio-frequency acceleration cavity used in a charged particle accelerator enabling the manufacturing with few waste amounts of the niobium material at low cost in a short time, the manufacturing method has each of the steps of (a) obtaining an ingot made from a disk-shaped niobium material, (b) slicing and cutting the niobium ingot into a plurality of niobium plates each with a predetermined thickness, by vibrating multiple wires back and forth while spraying fine floating abrasive grains with the niobium ingot supported, (c) removing the floating abrasive grains adhered to the sliced niobium plates, and (d) performing deep draw forming on the niobium plates and thereby obtaining a niobium cell of a desired shape.

A high-current, compact, conduction cooled superconducting radio-frequency cryomodule for particle accelerators. The cryomodule will accelerate an electron beam of average current up to 1 ampere in continuous wave (CW) mode or at high duty factor. The cryomodule consists of a single-cell superconducting radio-frequency cavity made of high-purity niobium, with an inner coating of Nb3Sn and an outer coating of pure copper. Conduction cooling is achieved by using multiple closed-cycle refrigerators. Power is fed into the cavity by two coaxial couplers. Damping of the high-order modes is achieved by a warm beam-pipe ferrite damper.

A superconducting RF coil array which may be used in whole body MRI scanners and / or in dedicated MRI systems. Some embodiments provide a superconducting RF coil array for at least one of receiving signals from and transmitting signals to a sample during magnetic resonance analysis of the sample, the superconducting RF coil array comprising a thermally conductive member configured to be cryogenically cooled, and a plurality of coils elements comprising superconducting material, wherein each coil element is thermally coupled to the thermally conductive member and is configured for at least one of (i) receiving a magnetic resonance signal from a spatial region that is contiguous with and / or overlaps a spatial region from which at least one other of the plurality of coil elements is configured to receive a signal and (ii) transmitting a radiofrequency signal to a spatial region that is contiguous with and / or overlaps a spatial region to which at least one other of the plurality coil elements is configured to transmit a radiofrequency signal.

Superconducting rf is limited by a wide range of failure mechanisms inherent in the typical manufacture methods. This invention provides a method for fabricating superconducting rf structures comprising coating the structures with single atomic-layer thick films of alternating chemical composition. Also provided is a cavity defining the invented laminate structure.

An electron gun for generating an electron beam is provided, which includes a secondary emitter. The secondary emitter includes a non-contaminating negative-electron-affinity (NEA) material and emitting surface. The gun includes an accelerating region which accelerates the secondaries from the emitting surface. The secondaries are emitted in response to a primary beam generated external to the accelerating region. The accelerating region may include a superconducting radio frequency (RF) cavity, and the gun may be operated in a continuous wave (CW) mode. The secondary emitter includes hydrogenated diamond. A uniform electrically conductive layer is superposed on the emitter to replenish the extracted current, preventing charging of the emitter. An encapsulated secondary emission enhanced cathode device, useful in a superconducting RF cavity, includes a housing for maintaining vacuum, a cathode, e.g., a photocathode, and the non-contaminating NEA secondary emitter with the uniform electrically conductive layer superposed thereon.

A method for providing a superconducting surface on a laser-driven niobium cathode in order to increase the effective quantum efficiency. The enhanced surface increases the effective quantum efficiency by improving the laser absorption of the surface and enhancing the local electric field. The surface preparation method makes feasible the construction of superconducting radio frequency injectors with niobium as the photocathode. An array of nano-structures are provided on a flat surface of niobium. The nano-structures are dimensionally tailored to interact with a laser of specific wavelength to thereby increase the electron yield of the surface.

A flange joint system for SRF cavities. The flange joint system includes a set of high force spring clamps that produce high force on the simple flanges of Superconducting Radio Frequency (SRF) cavities to squeeze conventional metallic seals. The system establishes the required vacuum and RF-tight seal with minimum particle contamination to the inside of the cavity assembly. The spring clamps are designed to stay within their elastic range while being forced open enough to mount over the flange pair. Upon release, the clamps have enough force to plastically deform metallic seal surfaces and continue to a new equilibrium sprung dimension where the flanges remain held against one another with enough preload such that normal handling will not break the seal.

The invention reveals a superconducting radio frequency unit. The superconducting radio frequency unit includes a body defining a hollow cavity, the body having first and second apertures, an axis atopposite ends of the body, and an equator extending between the first and second apertures, and surrounding the axis between the first and second apertures. The body includes at least a first weld that surrounds the axis at a location on the body spaced apart from the equator. Each of the weld seams extends through the body and has opposite sides terminating near the inside and outside of the body, and each of the weld seams includes a first conductive weld portion formed on one side of the weld seam and a second weld portion formed on the opposite side of the weld seam. The second weld may bea conductive weld, a piercing weld, or a transition weld.

The invention discloses an intelligent monitoring system of a superconducting access system, wherein the intelligent monitoring system is applied to the superconducting access system to realize real-time remote monitoring, control and maintenance so as to guarantee normal work of the superconducting access system. The intelligent monitoring system is composed of a main control module, a power supply detection module, a current detection module, a voltage detection module, a refrigeration system monitoring module, a case temperature monitoring module, a power monitoring module, a storage module, a liquid crystal display module, a fault warning module and a remote monitoring module. According to the intelligent monitoring system disclosed by the invention, with an ARM architecture processor with high performance and low power consumption, data acquisition, warning, controlling, processing, information recording and system maintenance are carried out on a BA channel of the superconducting access system, a BA refrigeration system and a BA high-stability power system in real time, so that reliability of the superconducting access system and network transmission can be improved. The intelligent monitoring system has advantages of powerful function, high precision, wide range, fast speed, low power consumption and simple control in fields of monitoring, controlling, and maintenance.

The invention discloses a superconducting magnetic resonance imaging machine, and a construction method and a use thereof. The superconducting magnetic resonance imaging machine of the invention comprises imaging areas, at least one vacuum insulation cover, a main magnet and a low-temperature cooling system, wherein the main magnet generates magnetic fields in the imaging areas; the low-temperature cooling system is connected with the vacuum insulation cover; a low vacuum space is formed and a lower-temperature heat conducting plate and at least one high vacuum inner cover and high vacuum outer cover are arranged inside the vacuum insulation cover; the vacuum insulation cover at least provides one imaging area; at least one superconducting radio frequency coil is arranged inside the low vacuum space and connected with the low-temperature heat conducting plate; and the low-temperature heat conducting plate is connected with the low-temperature cooling system through a heat pipe to realize and maintain the lower temperature condition of the superconducting radio frequency coil. The construction of the vacuum insulation cover is suitable for the imaging of the following body parts: breasts, knees, wrists, feet, a neck and a head. The invention can improve the magnetic resonance imaging quality and achieve a high signal-to-noise ratio in the imaging areas.

A high-current, compact, conduction cooled superconducting radio-frequency cryomodule for particle accelerators. The cryomodule will accelerate an electron beam of average current up to 1 ampere in continuous wave (CW) mode or at high duty factor. The cryomodule consists of a single-cell superconducting radio-frequency cavity made of high-purity niobium, with an inner coating of Nb3Sn and an outer coating of pure copper. Conduction cooling is achieved by using multiple closed-cycle refrigerators. Power is fed into the cavity by two coaxial couplers. Damping of the high-order modes is achieved by a warm beam-pipe ferrite damper.

A superconducting radio frequency (SRF) cell includes a body defining a hollow cavity having a first iris at a first end of the body, a second iris at a second end of the body, an axis that extends between the first and second irises and an equator around the axis between the first and second irises. The body includes a first weld seam around the axis at a location on the body spaced from the equator. A method for producing the SRF cavity includes: (a) providing a first-partial cell including a first cell welding edge; (b) providing a second-partial cell including a second cell welding edge; (c) positioning the first- and second-partial cells with the first and second cell welding edges facing toward each other; and (d) welding the first- and second-partial cells together at a position other than the equator of the body.