The NSTX fast-ion D-alpha diagnostic

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

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 at ASDEX Upgrade

Fast Ion Loss Diagnostic in ASDEX Upgrade

The confinement of fast particles is of crucial importance for next step fusion devices like ITER. Since fast ion losses might reduce the core heating and, in addition, cause untolerable first wall load, it is important to understand and possibly avoid them. Here, an integrated approach is presented for the analysis of neutral beam injection related fast ion losses in ASDEX Upgrade. It consists...