Document Detail


ac Modeling and impedance spectrum tests of the superconducting magnetic field coils for the Wendelstein 7-X fusion experiment.
MedLine Citation:
PMID:  17979447     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The impedance spectrum test was employed for detection of short circuits within Wendelstein 7-X (W7-X) superconducting magnetic field coils. This test is based on measuring the complex impedance over several decades of frequency. The results are compared to predictions of appropriate electrical equivalent circuits of coils in different production states or during cold test. When the equivalent circuit is not too complicated the impedance can be represented by an analytic function. A more detailed analysis is performed with a network simulation code. The overall agreement of measured and calculated or simulated spectra is good. Two types of short circuits which appeared are presented and analyzed. The detection limit of the method is discussed. It is concluded that combined high-voltage ac and low-voltage impedance spectrum tests are ideal means to rule out short circuits in the W7-X coils.
Authors:
Hartmut Ehmler; Matthias Köppen
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Review of scientific instruments     Volume:  78     ISSN:  0034-6748     ISO Abbreviation:  Rev Sci Instrum     Publication Date:  2007 Oct 
Date Detail:
Created Date:  2007-11-05     Completed Date:  2008-01-08     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0405571     Medline TA:  Rev Sci Instrum     Country:  United States    
Other Details:
Languages:  eng     Pagination:  104705     Citation Subset:  IM    
Affiliation:
Max-Planck-Institute for Plasma Physics, EURATOM-Association, Wendelsteinstrasse 1, D-17489 Greifswald, Germany. hartmut.edmler@hmi.de
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MeSH Terms
Descriptor/Qualifier:
Computer Simulation
Electric Conductivity
Electromagnetic Phenomena / instrumentation*,  methods
Equipment Design
Equipment Failure Analysis
Models, Theoretical*
Nuclear Fusion*
Reproducibility of Results
Research / instrumentation*,  methods
Sensitivity and Specificity
Spectrum Analysis / methods*
Transducers*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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