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Jennifer HayELMs in fusion language is an acronym for Edge Localized Modes. ELMs behave rather like solar flares where a huge burst of energy erupts out of the magnetic field confining the sun (itself a huge ball of plasma). They are bad news for fusion experiments as they cause the plasma to lose up to 10% of its energy.This "lost" plasma is mainly deposited on one part of the experiment casing - the divertor - which can be damaged over time by these repetitive bursts of energy. Therefore, the control of ELMs is an important issue for the ITER team.