Abstract
| Original language | English |
|---|---|
| Article number | 10D125 |
| Journal | Review of Scientific Instruments |
| Volume | 89 |
| Issue number | 10 |
| Number of pages | 5 |
| ISSN | 0034-6748 |
| DOIs | |
| Publication status | Published - 2018 |
Keywords
- Optical Spectroscopy
Cite this
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Velocity-space tomography using prior information at MAST. / Madsen, B.; Salewski, Mirko; Huang, J.; Jacobsen, A.S.; Jones, O.; McClements, K. G.
In: Review of Scientific Instruments, Vol. 89, No. 10, 10D125, 2018.Research output: Contribution to journal › Journal article › Research › peer-review
TY - JOUR
T1 - Velocity-space tomography using prior information at MAST
AU - Madsen, B.
AU - Salewski, Mirko
AU - Huang, J.
AU - Jacobsen, A.S.
AU - Jones, O.
AU - McClements, K. G.
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
KW - Optical Spectroscopy
U2 - 10.1063/1.5035498
DO - 10.1063/1.5035498
M3 - Journal article
C2 - 30399877
VL - 89
JO - Review of Scientific Instruments
JF - Review of Scientific Instruments
SN - 0034-6748
IS - 10
M1 - 10D125
ER -