Progress on Bayesian Inference of the Fast Ion Distribution Function

L. Stagner, W.W, Heidbrink, X. Chen, Mirko Salewski, B.A. Grierson

Research output: Contribution to journalConference abstract in journalpeer-review


The fast-ion distribution function (DF) has a complicated dependence on several phase-space variables. The standard analysis procedure in energetic particle research is to compute the DF theoretically, use that DF in forward modeling to predict diagnostic signals, then compare with measured data. However, when theory and experiment disagree (for one or more diagnostics), it is unclear how to proceed. Bayesian statistics provides a framework to infer the DF, quantify errors, and reconcile discrepant diagnostic measurements. Diagnostic errors and weight functions that describe the phase space sensitivity of the measurements are incorporated into Bayesian likelihood probabilities. Prior probabilities describe physical constraints. This poster will show reconstructions of classically described, low-power, MHD-quiescent distribution functions from actual FIDA measurements. A description of the full weight functions will also be shown.
Original languageEnglish
JournalAmerican Physical Society. Bulletin
Issue number16
Publication statusPublished - 2013
Event55th Annual Meeting of the APS Division of Plasma Physics - Denver, United States
Duration: 11 Nov 201315 Nov 2013
Conference number: 55


Conference55th Annual Meeting of the APS Division of Plasma Physics
Country/TerritoryUnited States


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