A tangentially viewing fast ion D-alpha diagnostic for NSTX

Multi-view fast-ion D-alpha spectroscopy diagnostic at ASDEX Upgrade.

A novel fast-ion D-alpha (FIDA) diagnostic that is based on charge exchange spectroscopy has been installed at ASDEX Upgrade. The diagnostic uses a newly developed high-photon-throughput spectrometer together with a low-noise EM-CCD camera that allow measurements with 2 ms exposure time. Absolute intensities are obtained by calibrating the system with an integrating sphere and the wavelength de...

Hydrogenic fast-ion diagnostic using Balmer-alpha light

Hydrogenic fast-ion populations are common in toroidal magnetic fusion AQ1 devices, especially in devices with neutral beam injection. As the fast ions orbit around the device and pass through a neutral beam, some fast ions neutralize and emit Balmer-alpha light. The intensity of this emission is weak compared with the signals from the injected neutrals, the warm (halo) neutrals and the cold ed...

Fast-ion D-alpha Measurements of the Fast-ion Distribution Function

Fast-ion D-alpha measurements at ASDEX Upgrade

A Plan for a Fast-Ion D-Alpha (FIDA) Measurement for JT-60SA∗)

A new fast-ion diagnostic based on the spectroscopy of the Doppler shifted Balmer-alpha line of Deuterium is considered for JT-60SA. Two sight lines, one tangential and the other perpendicular, are examined as candidates. It was found that the tangential one has better sensitivity than the perpendicular one. A trial of the FIDA measurement was performed on JT-60U. Signals due to the tangential-...