A flux pump is a kind of power source that energizes superconducting magnets usually embedded in the cryogenic system. Therefore, heat loss through current leads eliminated, allowing for more efficient cooling design. winding technique, so-called "wind-and-flip," had been proposed by authors to realize jointless HTS coil perfect resistanceless closed loop, which may enable induce persistent an wound with second-generation tape. In this paper, we investigated charging/discharging...

Magnetic linear dichroism and birefringence in (Ga,Mn)As epitaxial layers is investigated by measuring the polarization plane rotation of reflected linearly polarized light when magnetization lies sample. We report on spectral dependence ellipticity angles a broad energy range $0.12--2.7\phantom{\rule{4pt}{0ex}}\mathrm{eV}$ for series optimized samples covering wide Mn dopings Curie temperatures find clear blueshift dominant peak at exceeding host material band gap. These results are...

Conductor on round core (CORC) is one of high temperature superconducting (HTS) conductors with large current capacity. CORC stacks HTS tapes to increase the can have various structures according how we stack tapes. The direction spiral winding in each layer and overlapped area affect AC losses because mainly depend perpendicular magnetic fields We measured magnetization short samples structures. Each sample has a different number layers, layer, area. confirmed best structure least loss.

High Temperature Superconducting (HTS) cables for large current capacity are being studied in several forms power device applications. Currently, the developed DC applications rather than AC However, if a technology reducing loss is developed, it will be possible to apply HTS various devices. Twisted Stacked-Tape Cable (TSTC) one of cables. It made by stacking and twisting multiple tapes capacity. The TSTC should twisted uniformity distribution each tape. Since tape has wide thin film shape,...

Twisted stacked-tape cable (TSTC) is one of the high temperature superconducting (HTS) conductors with a large current capacity. These HTS cables for currents need their strands to be transposed even distribution. The strands, stacked tapes, in TSTC can by twist. Moreover, twist also decouple filaments an strand when tape striated. We made short samples striated or non-striated tapes verify effect magnetization loss reduction. were 4 mm that did not have copper stabilizers. In this paper,...

A 600 kJ HTS SMES system has been developed for power stabilization as a national project in Korea. Successful operating tests of the were recently completed. In this paper, 2.5 MJ class with magnets single solenoid, multiple solenoid and modular toroid type optimized using multi-modal optimization technique named multi-grouped particle swarm (MGPSO). The objective was to minimize total length superconductor wires satisfying some equality inequality constraints. stored energy constraints...

A 2.5 MJ Superconducting Magnetic Energy Storage System (SMES) is being developed as a national R&D project in Korea. It 2nd phase of total 3 phases program. In 1, we 600 kJ SMES which had the maximum storage over 1 MJ. Its magnet was an HTS solenoid, whereas for 2 toroid composed 28 double pancake coils. The final target to develop 5 SMES, will start from next year. operating temperature be below 20 K by conduction cooling. this paper, present and compare conceptual designs shape...

It has been well known that a coated conductor (CC), 2G superconducting tape, shows higher critical current and better performance than the 1G, BSCCO one. However, there still no way to make joint with CC, so it almost impossible build CC magnet in persistent mode. As viable solution for this, we have proposed special winding technology called Wind-and-Flip method. new possibility generation of mode CC. First, partially cut wide tape into two pieces along except at both end parts like...

The high temperature superconducting (HTS) conductors for electrical power devices and machines should have large current capacity low AC loss. Conductors on round core (CORC) is one of the promising that characteristics. It consists helically wound HTS tapes copper. We simulated a striated tape CORC with multiple in parallel. Two width 6 mm emulated 12 striation three 4 two striations, so on. performance depends diameter former pitch helical winding. First, we investigated characteristics...

A SMES magnet can be operating in three different modes: charging, storing, and discharging. The eddy current losses magnetization are generated during charging discharging the system. per cycle mainly period because is generally shorter that for charging. Magnetization In this paper, we investigated a decrease according to shapes of conduction cooling plates. plate having small was designed by dividing slitting. Also, toroidal coil constructed with many pancake coils were analyzed using 3-D...

Auto tuning niching genetic algorithm was used to design optimal HTS magnets for the 600 kJ class SMES system under several constraint conditions. Constraint conditions were operation loss of magnet (less than 2 W), inductance 24 H), number double pancake coils (about 10 DPCs), turns DPC 300 turns), outer diameter (close 800 mm) and total length wire in a 500 m). As result optimum design, we obtained parameters according two operating currents, 360 A 370 A. However, even though designed...

A 600 kJ superconducting magnetic energy storage system (SMES) project with high temperature superconductor (HTS) started as a national in Korea. The HTS model coils were designed and fabricated for preliminary test prior to the creation of full scale prototype. Single reinforced BSCCO-2223 wires used operating was decided be 20 K. Even though an SMES is not AC-powered device, time-varying currents during charging discharging periods lead generation time-variation fields applied AC loss. In...

We had proposed a winding method, the so-called "wind-and-flip," which enables persistent current-mode operation of high-temperature superconducting (HTS) pancake coil. Two coils been fabricated using this method and tested in liquid nitrogen bath with an external magnetic field. The result showed that time stability was not good enough to use for resonance imaging or nuclear when they were magnetized by field cooling at 77 K. In paper, test results stacked HTS coil center 1 T are presented....

Superconducting magnetic energy storage (SMES) systems with High Temperature (HTS) wires have been actively developed world-wide. A 600 kJ class SMES Bi-2223 HTS wire has in development as a national project since 2004 and is currently approaching the final testing stage of first three phases. In second phase project, several MJ will be developed. this paper, designs magnets for 5 DI-BSSCO YBCO coated conductor are presented compared.

Motors with HTS wires or bulks have been developed recently. These are a large synchronous motor at the field winding in rotor, hysteresis and reluctance motors bulk rotor. This paper presents fabrication test results of an induction motor. Conventional end rings short bars were replaced Stator conventional was used as stator Rated capacity rpm full rotor 0.75 kW 1710 rpm. Two parallel to make bars. The critical current BSCCO-2223 wire which 115 A. An electrodynamometer coupled directly shaft wires.

AC losses generated in the HTS winding differ from that of short sample because each turn is magnetically affected by adjacent turns. In this paper, we calculated loss pancake windings. Numerical calculation was carried out to figure magnetic field During both windings, were obtained using data. According results calculation, data multi-stacked tape more approached than single To prove effectiveness calculations, windings measured and compared. Finally phase transformer with constructed tested.

It is well known that HTS (high temperature superconductor) promising for magnet applications, but it has been almost impossible so far to apply them magnets in persistent current mode because of poor qualities their superconducting joints at higher as lower index values. To get rid the non-superconducting from an magnet, a wind-and-flip technique demonstrating operation using YBCO coated conductors had suggested. This paper presents experimental results measured drift pancake coil which was...

Recently, it is proposed to make striations on the YBCO coated conductor and transpose each other as one of solutions decrease perpendicular magnetization loss. For large power application using HTS, stacked packing conductors should be used because current carrying capacity a single limited. The has different AC loss characteristics from screening currents in adjacent affect local magnetic field at position conductors. In this paper, we research effect by stack, striation transposition...

A 2.5 MJ HTS superconducting magnetic energy storage (SMES) system is under development to compensate the sag or instantaneous black out for a utility side. The toroidal-type structure adapted reduce perpendicular field and stray at outside of SMES. magnet shows small field. However, parallel much larger than one. Therefore, Lorentz force tape can be so strong stress analysis should carried verify that maximum hoop normal are in appropriate range. In addition, overall inward an pancake...

This paper describes the electrical analysis and performance test result of windings a 10 HP homopolar fully superconducting synchronous motor. The motor has high temperature (HTS) armature field coils. stationary coils make cooling system simple easy because there is no cryo-moving part. design magnetization loss generated in are performed by finite element method. critical current results 2G wire, pancake coil for winding race track reported.

A 2.5 MJ HTS SMES is being developed as a national program in Korea. This paper presents design results of modular magnets for the toroidal SMES. We considered choice BSCCO-2223 or ReBCO tapes conductors Operating temperature was decided to be 20 K which could accomplished by conduction cooling with couple GM cryo-coolers. Key factors may include minimization total conductor requirement and low AC loss.

In this paper, a design methodology for toroid-type superconducting magnetic energy storage system using the analytical method and data table from finite element analysis is proposed. The simplifies model, uses analytically derived equations to calculate center flux density. order determine number of turns current analytic process, perpendicular density parallel are obtained table. A 2.5-MJ designed proposed method.

AC loss is one of the major topics in large power applications using high temperature superconductor such as transformers, transmission cables and fault current limiters because it closely related to operation efficiency. Multi-stacked tape conductors should be used transport those applications. A research various arrangements HTS tapes for multi-stacked has been performed increase capacity In this paper, we studied magnetization shield effect from several different BSCCO Face-to-Face type,...