Article,
Tomographic reconstructions of the fast-ion phase space using imaging neutral particle analyser measurements
Contributors
Rueda-Rueda, José
0000-0002-4535-326X
(Corresponding author)
[1]
Garcia-Munoz, Manuel
0000-0002-3241-502X
[1]
Viezzer, Eleonora
0000-0001-6419-6848
[1]
Schneider, Philip Adrian
0000-0001-7257-3412
[2]
Oyola, P
0000-0002-8455-1090
[1]
Galdon-Quiroga, Joaquín
0000-0002-7415-1894
[1]
Salewski, Mirko
0000-0002-3699-679X
[3]
Schmidt, Bo Simmendefeldt
0000-0001-5302-9489
[3]
Garcia-Dominguez, Javier
0000-0002-3903-0560
[1]
Affiliations
- [1] University of Seville [NORA names: Spain; Europe, EU; OECD];
- [2] Max Planck Institute for Plasma Physics [NORA names: Germany; Europe, EU; OECD];
- [3] Technical University of Denmark [NORA names: DTU Technical University of Denmark; University; Denmark; Europe, EU; Nordic; OECD]
Abstract
In this paper we demonstrate how the inversion, in energy and major radius (E, R) coordinates, of imaging neutral particle analyser (INPA) measurements can be used to obtain the fast-ion distribution. The INPA is most sensitive to passing ions with energies in the range (20–150) keV and pitches near 0.5 in the core and 0.7 near the plasma edge. Inversion of synthetic signals, via 0th-order Tikhonov and Elastic Net regularization, were performed to demonstrate the capability of recovering the ground truth fast-ion 2D phase-space distribution resolved in major radius and energy, even in the presence of moderate noise levels (10%). Finally, we apply our method to measure the 2D phase-space distribution in an MHD quiescent plasma at ASDEX Upgrade and find good agreement with the slowing down fast-ion distribution predicted by TRANSP.
