We present the first measurement of a local fast-ion 2D velocity distribution function f(ν∥, ν⊥). To this end, we heated a plasma in ASDEX Upgrade by neutral beam injection and measured spectra of fast-ion Dα (FIDA) light from the plasma centre in three views simultaneously. The measured spectra agree very well with synthetic spectra calculated from a TRANSP/NUBEAM simulation. Based on the measured FIDA spectra alone, we infer f(ν∥, ν⊥) by tomographic inversion. Salient features of our measurement of f(ν∥, ν⊥) agree reasonably well with the simulation: the measured as well as the simulated f(ν∥, ν⊥) are lopsided towards negative velocities parallel to the magnetic field, and they have similar shapes. Further, the peaks in the simulation of ...
Superthermal ions in tokamak plasmas play a critical role in heating and current drive, and their co...
Spectra of passive fast-ion D-alpha (FIDA) light from beam ions that charge exchange with background...
We demonstrate the measurement of a 2D MeV-range ion velocity distribution function by velocity-spac...
We present the first measurement of a local fast-ion 2D velocity distribution function f(ν∥, ν⊥). To...
Fast-ion Dα (FIDA) and collective Thomson scattering (CTS) diagnostics provide indirect measurements...
We compute tomographies of 2D fast-ion velocity distribution functions from synthetic collective Tho...
Velocity-space tomography of the fast-ion distribution function in a fusion plasma is usually a phot...
Velocity-space tomography has been used to infer 2D fast-ion velocity distribution functions. Here w...
To investigate the fast ion behavior, a fast ion D-alpha (FIDA) diagnostic system has been installed...
All the information about a plasma species is encoded in its distribution function. While it would b...
Fast ions are produced by neutral beam injection and ion cyclotron heating in toroidal magnetic fusi...
A fast-ion D-alpha (FIDA) diagnostic has been developed for the fully tungsten coated ASDEX Upgrade ...
The fast-ion Dα (FIDA) diagnostic is an application of charge-exchange recombination spectroscopy. F...
The Dα light emitted by neutralized deuterium fast ions is measured in magnetohydrodynamics (MHD)-qu...
Visible imaging has been used to provide the 2D spatial structure and temporal evolution of the prof...
Superthermal ions in tokamak plasmas play a critical role in heating and current drive, and their co...
Spectra of passive fast-ion D-alpha (FIDA) light from beam ions that charge exchange with background...
We demonstrate the measurement of a 2D MeV-range ion velocity distribution function by velocity-spac...
We present the first measurement of a local fast-ion 2D velocity distribution function f(ν∥, ν⊥). To...
Fast-ion Dα (FIDA) and collective Thomson scattering (CTS) diagnostics provide indirect measurements...
We compute tomographies of 2D fast-ion velocity distribution functions from synthetic collective Tho...
Velocity-space tomography of the fast-ion distribution function in a fusion plasma is usually a phot...
Velocity-space tomography has been used to infer 2D fast-ion velocity distribution functions. Here w...
To investigate the fast ion behavior, a fast ion D-alpha (FIDA) diagnostic system has been installed...
All the information about a plasma species is encoded in its distribution function. While it would b...
Fast ions are produced by neutral beam injection and ion cyclotron heating in toroidal magnetic fusi...
A fast-ion D-alpha (FIDA) diagnostic has been developed for the fully tungsten coated ASDEX Upgrade ...
The fast-ion Dα (FIDA) diagnostic is an application of charge-exchange recombination spectroscopy. F...
The Dα light emitted by neutralized deuterium fast ions is measured in magnetohydrodynamics (MHD)-qu...
Visible imaging has been used to provide the 2D spatial structure and temporal evolution of the prof...
Superthermal ions in tokamak plasmas play a critical role in heating and current drive, and their co...
Spectra of passive fast-ion D-alpha (FIDA) light from beam ions that charge exchange with background...
We demonstrate the measurement of a 2D MeV-range ion velocity distribution function by velocity-spac...