Journal
REVIEW OF SCIENTIFIC INSTRUMENTS
Volume 89, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5035498
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Funding
- ITPA Energetic Particle Physics Topical Group
- Euratom research and training programme [20142018, 633053]
- RCUK Energy Programme [EP/P012450/1]
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Velocity-space tomography provides a way of diagnosing fast ions in a fusion plasma by combining measurements from multiple instruments. We use a toroidally viewing and a vertically viewing fast-ion D-alpha diagnostic installed on the mega-amp spherical tokamak ( before the upgrade) to perform velocity-space tomography of the fast-ion distribution function. To make up for the scarce amount of data, prior information is included in the inversions. We impose a non-negativity constraint, suppress the distribution in the velocity-space region associated with null-measurements, and encode the belief that the distribution function does not extend to energies significantly higher than those expected neoclassically. This allows us to study the fast-ion velocity distributions and the derived fast-ion densities before and after a sawtooth crash.
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