EUROfusion Glossary

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Glossary Term: Beam Emission Spectroscopy

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Beam Emission Spectroscopy (BES) measures plasma turbulence. It registers the light emitted from the neutral particle beams which are injected into the plasma for heating or diagnostic. These particles collide with plasma particles, get excited and emit light. The intensity variations of these emissions reflect the local density fluctuations, from which plasma turbulence can be measured.