Speaker
Mark Szutyanyi
(Department of Mathematics and Computational Sciences)
Description
The physics of Edge Localized Modes (ELM) is one of the most studied scientific fields in fusion research. Automatic detection of ELMs in different diagnostic signals is an important initial step during massive experimental data analysis.
This contribution contains the description of the generalized Sequential Probability Ratio Test (g-SPRT) method used for automatic ELM detection in different diagnostic signals collected on the COMPASS tokamak. After determination of H-mode periods based on D-alpha signal in a given shot, ELMs are automatically detected in different diagnostic time traces (e.g. magnetic signals, Li-BES signals, divertor probe signals and also in D-alpha signals). The onset time, the maximum location and value, moreover the duration of each detected ELM is determined.
g-SPRT is based on the classical SPRT, but instead of probability density functions, uses empirical distribution functions of studied phenomenon in diagnostic signals. Therefore approximation of empirical distribution functions of different phenomena in diagnostic signals has also been worked out.
Analyzed diagnostic signals came from different radial positions of the studied plasma volume, thus from arrival times of given ELM into different detectors, the radial velocity of ELM is also estimated.
Comparison of results from g-SPRT method with two different automatic ELM detection method (threshold technique and correlation technique), in different shots, will be also presented.
Co-authors
Attila Bencze
(Department of Plasma Physics, Institute for Particle and Nuclear Physics, Wigner RCP of the H.A.S., Konkoly Thege Miklos road 29-33, H-1121 Budapest, Hungary)
Mark Szutyanyi
(Department of Mathematics and Computational Sciences, Szechenyi Istvan University, Gyor, Hungary)
Martin Hron
(Tokamak Department, Institute of Plasma Physics of the CAS, Za Slovankou 1782/3 182 00 Prague 8, Czech Republic)
Miklos Berta
(Department of Physics and Chemistry, Szechenyi Istvan University, Gyor, Egyetem ter 1., Hungary)
Radomir Panek
(Tokamak Department, Institute of Plasma Physics of the CAS, Za Slovankou 1782/3 182 00 Prague 8, Czech Republic)
