Ye Bai

Focusing solenoids for accelerators and other charged particle beam applications usually have general requirements: focusing strength, stray field, eddy current losses and specific requirements. For industrial applications discussed in the paper, conventional resistive solenoids can be used, which have specific requirements include maximum operatio...

The design, analysis and experimental test of a High Temperature Superconductor (HTS) current lead with parallel HTS tapes for MRI applications are presented. Two HTS tapes are electrically shunted in parallel in each current lead to increase its current-carrying capability. Analytical and finite element analysis has been conducted to investigate t...

Purpose: To develop a highly efficient magnetic field gradient coil for head imaging that achieves 200 mT/m and 500 T/m/s on each axis using a standard 1 MVA gradient driver in clinical whole-body 3.0T MR magnet. Methods: A 42-cm inner diameter head-gradient used the available 89- to 91-cm warm bore space in a whole-body 3.0T magnet by increasin...

Purpose: To build and evaluate a small-footprint, lightweight, high-performance 3T MRI scanner for advanced brain imaging with image quality that is equal to or better than conventional whole-body clinical 3T MRI scanners, while achieving substantial reductions in installation costs. Methods: A conduction-cooled magnet was developed that uses le...

To improve the openness of MRI scanners and reduce potential patient claustrophobia, a novel magnet concept with conical-shaped outermost main coils was investigated. This concept may also improve the coil stability because the Lorentz force acting on conical coils is mostly perpendicular to the coil/former interface, which may reduce friction-slip...

The authors had reported components' development of 3 T-250 mm bore MgB2 magnet system. Pre-reacted MgB2 tape wire with copper lamination had n-value related problem due to raw Boron particle size inequality, but it had been corrected. Long MgB2 wires over 3 km had been supplied. All six component coils were made with a wet winding procedure. They...

To achieve high B0 homogeneity adequate for the required IQ, passively shimmed superconducting MRI magnets employ extensive amount of shim steel to compensate individual variations in each magnet due to manufacturing tolerances and site environmental magnetic field. The shim pieces are usually mounted on the shim trays, which are then inserted into...

The MRI magnet composed of a set of multi-layer solenoidal coils provides the main magnetic field for MRI imaging. Due to the large number of turns in each main coil, its overall parasitic capacitor is possibly at a few nF level. Together with their large inductance, the coils may have a resonance frequency in KHz range, which is within the gradien...

A large bore NbTi superconducting magnet with liquid helium bath cooling has been developed for a micro-sized superconducting magnetic energy storage (SMES). The superconducting magnet has the clear bore of 480 mm, outer diameter of 550 mm and height of 500 mm. The magnet system is cooled in a compact cryostat with two GM cryocoolers. One of the cr...

A conduction-cooled high temperature superconducting (HTS) magnet system through a solid nitrogen protection with energy storage of 30 kJ was developed. The HTS magnet system is used to investigate fast discharging performances with a constant output voltage. The superconducting magnet consists of 14 double pancakes wound with Bi2223 tape with the...

We are carrying out a project to develop a conduction-cooled high temperature superconducting magnet system with an energy storage of 25 kJ. This magnet system will be used to investigate fast discharging performances. The magnet is constructed with 20 double pancakes. Each pancake is wound with Bi2223 tape. The magnet has an outer diameter of 212...

In high-energy physics, medical treatments, and space detections, quadrupole field distributions and sextupole field distributions are often required over a large spherical volume. Traditionally, these fields can be generated with cylindrical magnets. In comparison with cylindrical magnets, the spherical magnets have the advantages of smaller value...

Aluminum-stabilized superconductors have been employed in superconducting magnet, such as SMES and detector magnets etc. The stability and homogeneity of temperature in superconducting magnet fabricated by these kinds of conductors are considerably improved due to the advantage of high RRR and high thermal conductivity at low temperature. Because o...

The Magnetic Stereotaxis System (MSS) is a unique medical device designed to deliver drugs and other therapies directly into deep brain tissues. This approach uses superconducting coils to manipulate a small permanent magnet pellet attached to a catheter through the brain tissues. The movement of the small pellet is controlled by a remote computer...

Superconducting magnets cooled by cryocooler, without liquid helium, have been developed in recent years. This kind of magnet system is very easy and convenient to operate. The stability of the magnet depends on the balance between the cryocooler refrigeration capacity and the thermal loads. Based on thermal analysis for the magnet, study has been...

Using the method of separation of variables and expanding the magnetic field generated by currents flowing on a sphere by means of Fourier-Legendre expansion, we can obtain the inverse relationship between the current density and magnetic flux density. The current density required to generate a specified target field inside the sphere may be evalua...

Using the method of separation of variables and expanding the magnetic field generated by currents flow on a sphere by means of Fourier-Legendre expansion, the inverse relationship between the current density and magnetic field. The current density required to generate a specified target field BZ inside the sphere may be evaluated. This approach de...