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Detection of Causal Relations in Time Series Affected by Noise in Tokamaks Using Geodesic Distance on Gaussian Manifolds

Murari, Andrea (author)
Culham Sci Ctr, EUROfus Consortium, JET, Abingdon OX14 3DB, Oxon, England.;Univ Padua, Consorzio RFX, Acciaierie Venete SpA, CNR,ENEA,INFN, I-35127 Padua, Italy.;Culham Sci Ctr, JET, EUROfus Programme Management Unit, Abingdon OX14 3DB, Oxon, England.
Bergsåker, Henric (author)
KTH,Fusionsplasmafysik
Bykov, Igor (author)
KTH,Fusionsplasmafysik
show more...
Frassinetti, Lorenzo (author)
KTH,Fusionsplasmafysik
Garcia-Carrasco, Alvaro (author)
KTH,Fusionsplasmafysik
Hellsten, Torbjörn (author)
KTH,Fusionsplasmafysik
Johnson, Thomas (author)
KTH,Fusionsplasmafysik
Menmuir, Sheena (author)
KTH,Fusionsplasmafysik
Petersson, Per (author)
KTH,Fusionsplasmafysik
Rachlew, Elisabeth, 1944- (author)
KTH,Fysik
Ratynskaia, Svetlana (author)
KTH,Rymd- och plasmafysik
Rubel, Marek (author)
KTH,Fusionsplasmafysik
Stefanikova, Estera (author)
KTH,Fusionsplasmafysik
Ström, Petter (author)
KTH,Fusionsplasmafysik
Tholerus, Emmi (author)
KTH,Fusionsplasmafysik
Tolias, Panagiotis (author)
KTH,Rymd- och plasmafysik
Olivares, Pablo Vallejos (author)
KTH,Fusionsplasmafysik
Weckmann, Armin (author)
KTH,Fusionsplasmafysik
Zhou, Yushun (author)
KTH,Fusionsplasmafysik,Fusion Plasma Phys, EES, SE-10044 Stockholm, Sweden.
Zychor, I. (author)
Natl Ctr Nucl Res, PL-05400 Otwock, Poland.
Andersson Sundén, Erik (author)
Uppsala universitet,Tillämpad kärnfysik
Binda, Federico, 1987- (author)
Uppsala universitet,Tillämpad kärnfysik
Cecconello, Marco (author)
Uppsala universitet,Tillämpad kärnfysik
Conroy, Sean (author)
Uppsala universitet,Tillämpad kärnfysik
Dzysiuk, Nataliia (author)
Uppsala universitet,Tillämpad kärnfysik
Ericsson, Göran (author)
Uppsala universitet,Tillämpad kärnfysik
Eriksson, Jacob, Dr, 1985- (author)
Uppsala universitet,Tillämpad kärnfysik
Hellesen, Carl, 1980- (author)
Uppsala universitet,Tillämpad kärnfysik
Hjalmarsson, Anders (author)
Uppsala universitet,Tillämpad kärnfysik
Possnert, Göran, 1951- (author)
Uppsala universitet,Tillämpad kärnfysik
Sjöstrand, Henrik, 1978- (author)
Uppsala universitet,Tillämpad kärnfysik
Skiba, Mateusz, 1985- (author)
Uppsala universitet,Tillämpad kärnfysik
Weiszflog, Matthias (author)
Uppsala universitet,Tillämpad kärnfysik
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Culham Sci Ctr, EUROfus Consortium, JET, Abingdon OX14 3DB, Oxon, England;Univ Padua, Consorzio RFX, Acciaierie Venete SpA, CNR,ENEA,INFN, I-35127 Padua, Italy.;Culham Sci Ctr, JET, EUROfus Programme Management Unit, Abingdon OX14 3DB, Oxon, England. Fusionsplasmafysik (creator_code:org_t)
2017-10-24
2017
English.
In: Entropy. - : MDPI. - 1099-4300. ; 19:10
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Modern experiments in Magnetic Confinement Nuclear Fusion can produce Gigabytes of data, mainly in form of time series. The acquired signals, composing massive databases, are typically affected by significant levels of noise. The interpretation of the time series can therefore become quite involved, particularly when tenuous causal relations have to be investigated. In the last years, synchronization experiments, to control potentially dangerous instabilities, have become a subject of intensive research. Their interpretation requires quite delicate causality analysis. In this paper, the approach of Information Geometry is applied to the problem of assessing the effectiveness of synchronization experiments on JET (Joint European Torus). In particular, the use of the Geodesic Distance on Gaussian Manifolds is shown to improve the results of advanced techniques such as Recurrent Plots and Complex Networks, when the noise level is not negligible. In cases affected by particularly high levels of noise, compromising the traditional treatments, the use of the Geodesic Distance on Gaussian Manifolds allows deriving quite encouraging results. In addition to consolidating conclusions previously quite uncertain, it has been demonstrated that the proposed approach permit to successfully analyze signals of discharges which were otherwise unusable, therefore salvaging the interpretation of those experiments.

Subject headings

NATURVETENSKAP  -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)

Keyword

information geometry
Geodesic Distance on Gaussian Manifolds
recurrence plots
complex networks
ELMs
sawteeth
pacing experiments
Tokamaks
entropy

Publication and Content Type

ref (subject category)
art (subject category)

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