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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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