Low TC and high TC superconductor in power applications: contactless testing

Program of ASTRA/Scenet 2 workshop, 15. 16. 4. 2004

   Non-destructive methods based on solving inverse problem applied to magnetic field mapping of superconducting tapes and cables represent actual tasks of applied superconductivity both for high Tc as well as low Tc superconductors. The goal is obviously to determine current distribution in conductors used for transport of energy or applied in superconducting windings of magnets. In the frame of cooperation within EURATOM aroused couple of problems concerning current distribution in huge cables intended to work in devices for magnetic plasma storage and working at helium temperatures. Hall probe magnetometry used in magnetic field mapping at vicinity of the cable proved to be reliable and productive in gathering input data for Biot-Savart inverse, i.e. calculation of transport current distribution in the cable.
   Many years experience in developing, testing and calibration of Hall probes in IEE Bratislava resulted in production of hundreds of magnetic sensors based on Hall effect and working at broad range of temperatures from helium up to room. Concentration of charge carriers was tuned to shift quantum oscillations to larger magnetic fields in measurements at helium temperatures or, contrary, to increase sensitivity for measurements at 77K or 300K Higher sensitivity is especially important for magnetic field mapping at vicinity of HTC tapes with limited currents or in test measurements of LTC devices at room temperature when only small currents can be applied.
   We found interesting and useful to gather recent results in this field as well as related topics of contactless testing and also people attending the workshop to discuss the problems in informal atmosphere of spring 2004 in Bratislava.

Príspevky:

Prednášajúci Inštitúcia Názov
B.A. Glowacki Depart. Materials Science,
Univ. of Cambridge, UK
Dynamic flux patterns of multifilamentary Ag/Bi2 Sr2 Ca2 Cu3 O10-d tapes at 8K 77K temperatures by magnetooptic and Hall probe magnetometry
F. Bellina Faculty Engn.,
Univ. degli Studi di Udine, Italy
Current distribution identification in superconducting multistrand cables
M. Polák Depart. Electrodynamics Supercond.,
IEE SAS, Bratislava
Characterization of YBCO thin samples using Hall probe contactless measurements
F. Gömöry Depart. Supercond. Physics,
IEE SAS, Bratislava
Distribution of currents in the model of transmission cable
X. Granados ICMAB,
Barcelona, Spain
Magnetization and current distribution analysis by in field Hall mapping technique
A. Formisano Dipart. Ingn. Informaz. 2,
Univ. of Naples, Italy
Current unbalance detection in CICC cables with Hall probes
P. Ušák Depart. Electrodynamics Supercond.,
IEE SAS, Bratislava
The current distribution in tape Bi-2223/Ag as a function of current ramping up and down
S. Takács Depart. Supercond. Physics,
IEE SAS, Bratislava
Change of the induced magnetic field along twisted superconductors
A.D. Caplin Blackett Laboratory,
Imperial College, London, UK
Hall sensors for scanning, imaging and more
G. Perkins Blackett Laboratory,
Imperial College, London, UK
Scanning Hall technique for conductor characterization
M. Masti Inst. Electromagnetics,
Tampere Univ. of Technol., Finland
Hall - magnetometer for measuring magnetic field caused by alternating currents
E. Ušák Depart. Electrodynamics Supercond.,
IEE SAS, Bratislava
The influence of sample length on AC losses
P. Kováč Depart. Supercond. Physics,
IEE SAS, Bratislava
Magnetic fields above the colummar structure Bi-2223/Ag tapes
B. Klinčok Depart. Supercond. Physics,
IEE SAS, Bratislava
Study of AC transport in superconducting wire with help of pick- up coils
E. Demenčík Depart. Electrodynamics Supercond.,
IEE SAS, Bratislava
YBCO profiles at higher frequencies of external AC magnetic fields

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