This paper describes two general methods: field map processing and NMR lineshape analysis, that we are currently using for the on-going research of improvement techniques specifically applied to our 700 MHz LTS/HTS magnet. The validity methods is verified with comparison between calculations experiments. Also, a simple but effective analysis has been used identify principal source remanent magnetic measured in bore magnet: screening current induced (SCF) from 100-MHz HTS insert, comprised 48...

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...

A 700-mm bore superconducting magnet was built and operated in our laboratory to demonstrate the feasibility of newly developed superconductor wire for fabricating MRI magnets. The magnet, an assembly 10 coils each wound with a reacted s-glass insulated 1-km long, immersed solid nitrogen rather than bath liquid cryogen. This designed operate temperature range 10-15 K, maintained by cryocooler. combination this ldquowiderdquo immersion winding enables under conditions not possible low (LTS)...

Abstract Background: To analyse the association between pancreatogenic diabetes and volume of remnant pancreas after pancreaticoduodenectomy to identify clinicopathologic factors correlated with diabetes. Methods: Among patients who underwent pancreaticoduodenenctomy from 2003 2004, 55 survived by 2009 were able measure pre‐ post‐operatively CT volumetry included in this study. Twelve had before surgery. Median follow‐up duration was 55.2 67.3 months for volumetry, diabetes, respectively....

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.

This paper reports on the operation test of a 22.9 kV hybrid superconducting fault current limiter (SFCL) in KEPCO grid. The SFCL works at rated voltage and 630 A, respectively. There are two major objectives test: (1) long-term (2) tests for protection coordination study. lasted more than year. We experienced several times cryostat suspension due to blackouts false alarms sensor failures during operation. also carried out short circuit grid, equipped with breakers recloser. An artificial...

In the present study, graphite blocks were fabricated using synthetic scrap and phenolic resin, effect of heating rate during carbonization on their mechanical electrical characteristics was examined. While varying from 1, 3, 5, 7 to 9 °C/min, microstructure, density, porosity, flexural strength, compressive resistivity measured. As increased, pores in increased size, shape gas release paths became more irregular. Overall, it found that increases led degradation blocks' properties.

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 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 ability to correct unnatural-appearing, high, and deep double eyelid folds has been limited by the lack of redundant upper skin presence prior incision line scars in patients.From January 2000 September 2011, 256 patients with high underwent our fold-lowering procedure. first dissection was made at superficial layer between orbicularis oculi muscle orbital septum/retroorbicularis fat. second a deeper preaponeurotic fat levator aponeurosis. proceeded 7 8 mm farther cephalad fold separate...

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...

This paper presents the results of a study 2-dimensional normal zone propagation (NZP) in winding pack models comprised 12 straight YBCO tapes stacked with wet, i.e., epoxied, insulating spacers. In each pack, were connected electrically series such way that transport current through zigzagged from one end to other pack. An insulated heater strip placed at middle stack was energized trigger quench combination taps which permits length heated section be varied for 1- or NZP. Voltage various...

A 22.9 kV/630 A-class superconducting fault current limiter (SFCL) was installed on a distribution line in Icheon Substation for real-grid operation. The substation is located semi-urban area with moderate loads. SFCL of hybrid type. After installation it subjected to series on-site tests. Test procedures were determined by following convention testing both superconductivity-related and not-related specifications the SFCL. Tests performed minimum limiting test, temperature dielectric...

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...

This paper presents the results of a study, experimental and simulation, normal zone propagation (NZP) in winding pack models comprised several lengths YBCO tapes, each sandwiched by insulating spacers. A heater strip extending over entire length of, placed at midpoint model was energized to trigger quench middle tape. In model, tapes were connected electrically series such way that transport current through zigzagged from tape one side other model. The transverse speed propagations...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> This paper presents the results of an experimental and theoretical study stability protection small test coil assemblies wound with second-generation (2G) High-Temperature Superconducting (HTS) wires. The study, conducted as a part efforts to improve design applicability YBCO wire technology real-life power devices, such magnets, focused on two specific issues: 1) internal voltage developed...

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...

The YBCO coated conductor (CC) is one of the most promising superconductors for various superconducting applications. Although it has many advantages, joints CC are inevitable because there technical difficulties in lengthening CC. In joining process, important to reduce joint resistance between CCs order operate a persistent current mode. Several approaches have been proposed eliminate stabilizer Among them, this paper introduces chemical etching method that can damaging influences...

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...

A 22.9 kV superconducting fault current limiter (SFCL) has been in operation a real grid Korea. The SFCL is of hybrid type, which the detected by superconductor and bypassed high-speed switch to reactor parallel circuit for limitation. It rating 630 A, operated distribution line Icheon Substation, located suburban area with moderate loads. very stably no degradation performance. Temperatures level liquid nitrogen cooling superconductors have maintained within 0.1 K 0.3 cm, respectively,...

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....