Abstract A problem arising in several engineering areas is to design magnets outside a volume that produce desired magnetic field inside it. One instance of this stellarator design, where it has recently been shown permanent can provide the required shaping field. Here we demonstrate robust and efficient algorithm REGCOIL_PM calculate spatial distribution these magnets. The procedure involves s...

This paper presents a novel 2-D magnet array with gaps and staggers, which is especially suitable for magnetically levitated planar motor with moving magnets. The magnetic flux density distribution is derived by Fourier analysis and superposition. The influences of gaps and staggers on high-order harmonics and flux density were analyzed, and the optimized design is presented. Compared with the ...

This paper describes the finite element (FE)-based design of a slotted tubular permanent magnet actuator (TPMA) used in railway vehicle active lateral secondary suspension that improves the actuator’s thrust and lowers its cogging force under thermal and geometric constraints. To consider the electromagnetic and thermal fields and the complex interactions among the design variables, design was ...

The final focus system for the Thomson X-ray scattering experiment termed PLEIADES (Picosecond Laser-Electron InterAction for Dynamic Evaluation of Structures) at LLNL demands ultra-high field gradient quadrupoles in order to focus initially small beams to 1020μm spot sizes. The scheme present here circumvents limitations due to chromatic aberrations and space-charge effects in this relatively ...

One of the more challenging aspects of hybrid permanent magnet undulator design is end-field termination. Klaus Halbach provided indication of correct excitation patterns for tapered wigglers, but implementation on hybrid undulators has proven more difficult. Initial results on APS undulators achieved complete passive gap dependence of both total residual angle and trajectory through the device...

In this study, a direct drive in-wheel system is proposed as high power density for reducing the intermediate parts, such speed reducer by increasing torque. We propose design strategy to show that multipolarization and improvement of gap magnetic flux can effectively increase density. A Halbach array magnet rotor combines main electrode magnets spoke with core adopted technique improving compa...

1098-4402= Advanced high-brightness beam applications such as inverse-Compton scattering (ICS) depend on achieving of ultrasmall spot sizes in high current beams. Modern injectors and compressors enable the production of high-brightness beams having needed short bunch lengths and small emittances. Along with these beam properties comes the need to produce tighter foci, using stronger, shorter f...

This paper investigates the performance enhancements of permanent magnet Vernier machines (PMVMs) that can be achieved using a new structure Halbach array magnets (HAPMs) for direct-drive motorcycle application. To start with, size and design specifications electric machine are determined based on assumed acceleration drive cycle motorcycle. Then, five-segment (HAPMVMs) with two different slot/...

We report on the design, construction, and magnetic field measurements of a system of high field sextupole magnets made from NdFeB compounds. The magnets are utilized as a focusing system for neutral hydrogen ~or deuterium! atoms in a polarized atomic beam source based on Stern–Gerlach spin separation. Each magnet consists of 24 segments of permanently magnetized material differing in remanence...