What is it about?

Thermal ion losses velocity space have not yet been fully characterised in a magnetically confined fusion device. In this article we present the feasibility study of a new diagnostic which would provide fast resolved information of the thermal ion velocity space. Based on the working principle of the Fast Ion Loss Detector (FILD), the new detector presented here would collimate in gyro-phase the thermal ion lost population following the B field lines. Once collimated, they will impinge in an active component in different positions depending on their velocity space coordinates providing, therefore, the desire information. The preliminary design and dimensions as well as the possible physical motivations are inferred in this paper using the FILDSIM code.

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Why is it important?

The thermal ion loss cone could provide useful information on how their non-ambipolar transport would change the power threshold to enter in the High confinement mode (H-mode). Therefore, its characterisation is important to have a better understanding of the L-H transition.

Perspectives

I would like to acknowledge the great contribution of all the co-authors of this publication.

Jesús Poley
Ecole Polytechnique Federale de Lausanne

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This page is a summary of: Conceptual study for velocity space resolved thermal ion loss detection in tokamaks, Review of Scientific Instruments, September 2022, American Institute of Physics, DOI: 10.1063/5.0099087.
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