The fundamental understanding of the behavior of fusion plasmas is based on sophisticated measurements that allow non-invasive diagnosis of certain parameters. This presentation outlines the path from the need to determine a certain quantity, to a conceptual measurement principle towards an actual implementation on a fusion device, using the example of the LLAMA diagnostic. LLAMA stands for Lyman-Alpha Measurement Apparatus, a multi-channel, bandpass filter pinhole camera system and has been recently installed at DIII-D. It measures the Lyman-Alpha brightness profiles at the plasma edge, enabling the inference of edge neutral density profiles to study sourcing of plasma particles. This opens a previously hardly accessible field of studies with specific importance when scaling towards large scale future fusion devices, where the sourcing from neutrals is expected to be drastically reduced.
FusionEPtalks is brought to you by students and researchers involved in the field of nuclear fusion. Our mission is to do student-led webinars, expert talks and panels on the development of nuclear fusion as an energy source that connect scholars, engineers and enthusiasts around the world.