Theoretical Analysis and Design Consideration of Advanced Linear Type Magnetic Flux Pump
As a current compensator, we already developed a linear type magnetic flux pump (LTMFP) that is comprised of DC coils, three phase armature coils, an LTS Nb foil and laminated linear slots. The LTMFP produced a homopolar traveling magnetic field with DC bias current and 3-phase armature current and then, a pumping current is generated in the closed superconducting loop. In this study, we have proposed an advanced LTMFP which can easily produce homopolar traveling magnetic field with the combination of a permanent magnet and the AC armature current. Since the permanent magnets have replaced DC coils in the system, its structure and operation are simplified. As well as, the heating loss of the advanced LTMFP is reduced due to the permanent magnet compared with the LTMFP. From this reason, we confirmed that the advanced LTMFP has more simplified and efficient operation compared with already developed magnetic flux pumps. This paper describes the structure and operating principle of the advanced LTMFP. As well as, the distributions of electromagnetic-thermal analysis of the LTS Nb foil were calculated based on the finite element method (FEM). Thus, in order to realize the homopolar traveling magnetic field, appropriately designing parameters of the combination of AC current and the permanent magnet were obtained.
Electromagnetic analysis for multiple hybrid HTS electromagnets interfaced with LSM propulsion system in EMS maglev model
This study introduces over 400 km/h maglev vehicle system based on electromagnetic suspension (EMS) model. Such a maglev system is composed of high temperature superconducting (HTS) magnet, normal conducting magnet and propulsion system. The hybrid electromagnet (EM) consumes little power to keep large suspension gap. The propulsion system realizes to propel the vehicle along the guide-way and assist in braking action. Especially, as the essential point of EMS-based maglev model is to keep the stable suspension force in the high speed operation, the levitation and propulsion forces should be analyzed in order to equilibrate the suspension gap. In this paper, theoretical properties of the levitation force based on electromagnetic analysis are described, as we have been constructed a proto-type electromagnetic suspension (EMS) based maglev vehicle system. Based on the simulation results, we obtained the design parameters for variation suspension gap under high speed propulsion condition.
Parameters for low energy operation of CESR
We present a detailed design for operation of the Cornell Electron Storage Ring, CESR, in the energy range covering the /spl psi/ resonances and the Charm and Tau thresholds, as well as reaching to the upper Y resonances near 11 GeV. The addition of 18 m of super-ferric wiggler magnets will partially restore low energy beam emittance and damping times. Installation of superconducting quadrupoles in the interaction region and the addition of high performance superconducting RF cavities will enhance performance at all energies. Studies of optics, beam dynamics, wiggler and vacuum system performance, beam stability, and beam-beam effects confirm operation with a luminosity of 3/spl times/ 10/sup 32/ CM/sup -2/ sec/sup -1/ at 1.88 GeV.