AC Face Field Losses In A Type II Superconductor

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Evaluation of Self-Field Distributions for Bi2223 Tapes with

EDUCTION of AC losses in shilver-sheathed Bi2223 tapes is one of the key issues for practical AC power devices such as transmission cables, motors and transformers. The large loss generation in an AC external magnetic field is attributed to strong electromagnetic coupling among the superconducting filaments. This interfilamentary coupling is

Alternative designs of a superconducting synchronous

AC losses in the superconductor. The DI-BiSCCO tape is very sensitive to the magnetic field component perpendicular to the broad face of the tape and this unwelcome property requires the field to be controlled. In all the rotor designs considered here, as well as in an earlier transformer project [4], the field is guided by the use of iron to


Eur. J.Phys.41 (2020) 045203 F Grilli and E Rizzo Figure 2. Aninfinitesuperconductingslabsubjectedtoamagneticfieldparalleltoits face.Left


II. CONDUCTORS A. Requirements Accelerator magnets are special in several respects: i) they must be ramped from low to high field. ii) they must maintain an accurate field shape, under both steady state and ramping conditions. iii) all magnets of a given type must be energized in series to ensure that they exactly carry the same current.


stabilizing materials in order to reduce ac losses; iv) use of stainless steel as a reinforcing element. INTRODUCTION As the present NET specifications call for a toroidal magnetic field of about 5 T on the plasma axis the geometry of the TF coils svstem will require a maximum magnetic field on the conductor of about 11 T.


The AC losses measured in the frequency range from 60 Hz to 1000 Hz are compared with those of a similar coil wound with copper tape. The coil heating due to AC losses was monitored. At 60 Hz, the losses of the YBCO coil were nearly two orders of magnitude lower than those in the Cu coil.

Electrical Characterization of High Temperature

The energy dissipation or AC losses as a function of peak AC magnetic field, magnetic field sweep frequency, and transport current for a VAC sample and a sample manufactured by IGC - Advanced Superconductors (IGC) were measured at 77 K. The losses were measured using a pick up coil with a lock-in amplifier to measure the


a Type-II superconductor with a relatively high Ginzburg Landau parameter (ˇ40 close to stoichiometry [1]) as ities at 4.2K with the same losses as for Nb at 2K, if

AC face field losses in a type II superconductor

Apr 05, 2020 AC face field losses in a type II superconductor To cite this article: M R Halse 1970 J. Phys. D: Appl. Phys. 3 717 View the article online for updates and enhancements. Related content Generalized critical-state model of type II superconductors W I Dunn and P Hlawiczka-Calculation of hysteresis losses in hard superconductors carrying ac: isolated

Record fast-cycling accelerator magnet based onhigh

Feb 26, 2019 Sn superconductor (i) much higher critical current densities and fields, lower AC losses (ii) and (iii) higher operational temperatures. In this Letter we report the 12 T/s ramp rates achieved in a dual-bore accelerator HTS magnet prototype. The AC losses in a SC magnet are proportional to the mass of the conductor and depend on total


conceived as layer wound and made of two distinct sections, a low- and a high-field one, employing different superconductor cross-sections, and electrically connected through an embedded ENEA-type joint. The main features of the magnet system are described here; the results of mechanical, electrical and thermo-

Design Considerations for Fast-Cycling Superconducting

demand due to AC losses in the superconductor leads to a high operational cost. We outline a novel magnet technology based on HTS superconductors that may allow to reduce AC losses in the magnet coil possibly up to an order of magnitude as compared to similar applications based on LTS type superconductors.


Electric Field and Energy Losses of Rounded Superconducting / Ferromagnetic Heterostructures at Self-Field Conditions M. U. Fareed, B. C. Robert, and H. S. Ruiz Abstract The AC losses induced by an alternating transport current in type-II superconductors is a wellknownphenomena which still attracts much attention due to its intrinsic relevance

Design Study and Test Arrangement of HTS Transmission Line

field lines within the conductor space, and so the lower is the mean value. The optimized design of the DSFMR core with the power cable is shown in figure 3. The magnetic core is constructed using 100 µm thick Fe3%Si steel laminations to strongly reduce core eddy losses and improve B-field quality. Fig. 3.


Tampereen teknillinen yliopisto. Julkaisu 586 Tampere University of Technology. Publication 586 Mika Masti Hall Magnetometer for AC Characterization and Test Results of Bi-2223 Ta

E. A. GIJSBERTSE, J. L. J. M. Introduction

FLUX PENETRATION AND a.c. LOSSES IN TYPE II SUPERCONDUCTORS I. MODEL CALCULATIONS E. A. GIJSBERTSE, J. SIKKENGA and L. J. M. VAN DE KLUNDERT Department of Applied Physics, Twente University of Technology, P.O. Box 2l 7, 7500 AE Enschede, The Netherlands Received 22 December 1980


inertial sensors. It suffers from high eddy current losses and a small range of stable air gaps. Analysis of ac tuned circuit methods may be found in Kaplan [ref. 10]. For heavily loaded bearings, direct feedback methods have to be used. However, dynamics has not seen as much attention as it has in journal bearings.

Study of the Resistive Switching phenomenon in YBCO

In particular, in type II superconductors the Meissner effect occurs only as long as the applied magnetic field stays below a certain critical field, H C1 , but for higher fields the magnetic flux starts penetrating into the material and the superconductor enters the mixed state.

Bhujbal Knowledge City

4) Identify superconductor and its types. 5) Understands applications of nanoparticles in engineering field. ACH Applied Chemistry (17211) 1) Select proper type of cell based on the requirement in electronics and computer engineering. 2) Apply knowledge of extraction, properties of copper and aluminium in

Development of loss models for a high-temperature

a certain superconductor, and the power losses for the actual superconductor can be predicted in considerable more complicated cases. Key words: high-temperature superconductor, hysteresis losses, flux flow losses, critical state model, calorimetric measurements

Edinburgh Research Explorer

II. EXPERIMENTAL ETHOD Fig. 1 shows a schematic of the experimental arrangement used in this work to measure dynamic resistance of a four-tape YBCO stack at 77 K. An ac magnet comprising two vertically stacked sets of racetrack coils was used to produce ac magnetic field amplitudes at the sample of up to 100 mT. Two different


a zero in the field near both faces so the superconductor can sit on either of these zeroes. The knowledge gained from these calculations will be used to design a better separation apparatus. II) Screening (Paper submitted to Superconductivity. Science and Technology). We have made a theoretical calculation of the screening


induces electric field and, hence, an eddy current inside the su-perconductor. In an ordinary conductor, the vectors of the elec-tric field and current density are related by the linear Ohm law. Type-II superconductors are, instead, characterized in the Bean critical state model [7] by a highly nonlinear current voltage re-

Tampere University of Technology. Publication 923

φ Field orientation Φ 0 Magnetic flux quantum ρ Cu Electrical resistivity of copper σ u Tensile strength AC Alternating current Aluheat Project for building High efficiency aluminium billet in-duction heater ASC American superconductor corporation BCS Theory formulated by Bardeen, Cooper and Schrieffen Bi-2223 Bismuth based high

Unit 7 AC losses in Superconductors

USPAS June 2015, Rutgers University Superconducting accelerator magnets AC Losses in Superconductors 4.2 Scope of the Lesson AC losses general classification 1. Hysteresis losses 2. Coupling and eddy current losses 3. Self-field losses Role of transport current in loss terms Impact of AC losses on cryogenics


superconductor are proposed to be arranged one above other and connected in series with current flow in opposite direction. Due to this the magnetic fields arising from the currents are largely cancelled out. The cancellation of magnetic fields also minimise ac losses. Table 2 Parameters of 12 kV SFCL Specification Parameters

NIELIT Aurangabad B.Tech : Electronics Engineering

Superconductivity- Introduction, critical temperature, critical field, Meissner effect, type I, type-II superconductor, BCS theory of superconductivity, applications of superconductivity. Wave and particle duality of radiation, de-Broglie,s hypothesis, Wavelength of matter waves, Electron

Superconducting windings in a power transformer, an old

within the superconductor, with net energy storage. The direction of that field will depend on whether previously 10 or -10 was flowing. Accordingly, there is memory and hysteresis in a type-II superconductor. 2. Derivation of the loss-rate equation The loss formula used in ref~r~nce (1) is eSsen­

Estimation of Self-Field Critical Current and Transport

field critical current and total AC losses of the cable by means of numerical models, which are able to take into account the geometric layout of the cable as well as the complex J c(B; ) dependence of the superconductor materials of the manufacturers II. PROPERTIES OF THE ROEBEL CABLES Two Roebel cable samples were assembled from 12mm-wide

On the Cover

EMF electromagnetic field F field fcc face-centered cubic FCL fault current limiter FIB focused ion beam FM ferromagnetic FWHM full width at half maximum GB grain boundary GDP gross domestic product GTO gate-turnoff thyristor Hc2 upper critical field of type II superconductor HHV higher heating value HLPE hybrid liquid phase epitaxy

Generalized critical-state model of type II superconductors

Apr 23, 2020 Surface structure and a.c. losses in superconductive niobium R M Easson and P Hlawiczka-Flux penetration and a.c. losses in superconducting niobium R M Easson and P Hlawiczka-Theory of ac loss in type II superconductors in the Meissner state P H Melville-Recent citations Nonlinear AC magnetic response of the Hg1223 powder A. Rysak and S.Z. Korczak-

NASA Technical Reports Server (NTRS)

viz., (i) a prototype superconductor magnetic suspension system(l), and (ii) a pilot cryogenic wind tunnel facility(2). In the first development, the University of Virginia research group designed, built, and tested an all­ superconductor prototype magnetic suspension system for the principal purpose of establishing the feasibility of