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Automatic location of L/H transition times for physical studies with a large statistical basisGonzales, S. ...Completely automatic techniques to estimate and validate L/H transition times can be essential in L/H transition analyses. The generation of databases with hundreds of transition times and without ... human intervention is an important step to accomplish (a) L/H transition physics analysis, (b) validation of L/H theoretical models and (c) creation of L/H scaling laws. An entirely unattended methodology is presented in this paper to build large databases of transition times in JET using time series. The proposed technique has been applied to a dataset of 551 JET discharges between campaigns C21 and C26. A prediction with discharges that show a clear signature in time series is made through the locating properties of the wavelet transform. It is an accurate prediction and the uncertainty interval is 3.2 ms. The discharges with a non-clear pattern in the time series use an L/H mode classifier based on discharges with a clear signature. In this case, the estimation error shows a distribution with mean and standard deviation of 27.9 ms and 37.62 ms, respectively. Two different regression methods have been applied to the measurements acquired at the transition times identified by the automatic system. The obtained scaling laws for the threshold power are not significantly different from those obtained using the data at the transition times determined manually by the experts. The automatic methods allow performing physical studies with a large number of discharges, showing, for example, that there are statistically different types of transitions characterized by different scaling laws.Source: Plasma physics and controlled fusion. - ISSN 0741-3335 (Article number 065009, Iss. 6, Vol. 54, 2012, 20 str.)Type of material - article, component partPublish date - 2012Language - englishCOBISS.SI-ID - 26296871
Author
Gonzales, S. |
Vega, J. |
Murari, Andrea |
Lengar, Igor |
Snoj, Luka, 1981- |
Trkov, Andrej |
Žefran, Bojan
Topics
jedrska fizika |
tokamak |
fizika plazme
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source: Plasma physics and controlled fusion. - ISSN 0741-3335 (Article number 065009, Iss. 6, Vol. 54, 2012, 20 str.)
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Gonzales, S. | ![]() |
Vega, J. | ![]() |
Murari, Andrea | ![]() |
Lengar, Igor | 19167 |
Snoj, Luka, 1981- | 27819 |
Trkov, Andrej | 08557 |
Žefran, Bojan | 15742 |
Source: Personal bibliographies
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