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Automatic ELM Location in JET Using a Universal Multi-Event Locator

S. González, J. Vega, A. Murari, A. Pereira, M. Beurskens, JET-EFDA Contributors

Fusion Science and Technology / Volume 58 / Number 3 / November 2010 / Pages 755-762

Selected Paper from Sixth Fusion Data Validation Workshop 2010 (Part 2)

Massive amounts of data generated by fusion machines (such as JET) require developing automatic methods for data analysis. Edge-localized modes (ELMs) are instabilities occurring in the edge of H-mode plasmas. The aim of this work is to develop an automatic off-line method for identifying and locating ELMs. This method uses Universal Multi-Event Locator (UMEL) as the event locator. The combination of information from D emission and diamagnetic energy allows the recognition of single ELMs. This paper shows the way in which waveforms of a wide range of discharges can be treated and how UMEL is applied in order to identify and locate ELMs independently of the signal amplitudes. A large database of more than 1200 discharges has been used to test the performance of the method obtaining 226 751 ELMs.

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