Extended fast-ion D-alpha diagnostic on DIII-D

Fast Ion Loss Diagnostics on DIII-D

Sawteeth and tearing modes affect fast ion confinement, while large fast ion densities can drive collective instabilities, including toroidicity-induced Alfvén eigenmodes. Losses of energetic alpha particles in ITER will reduce the alpha heating available to reach ignition, and have the potential to cause major damage to the first wall of ITER. Measurements of the internal mode structures of th...

Fast Wave Current Drive on Diii - D

The physics of electron heating and current drive with the fast magnetosonic wave has been demonstrated on DIU-D , in reasonable agreement with theoretical modeling. A recently completed upgrade to the fast wave capability should allow f id noninductive current drive in steady state advanced confinement discharges and provide some current density profile control for the Advanced Tokamak Program...

Alfvén Instabilities in Diii-d: Fluctuation Profiles, Thermal-ion Excitation and Fast-ion Transport

New fluctuation and fast-ion diagnostics provide a wealth of data about fast-ion instabilities during neutral beam injection into DIII-D. Toroidicity-induced Alfvén eigenmodes (TAE), reversed-shear induced Alfvén eigenmodes (RSAE), and compressional Alfvén eigenmodes are observed. Owing to differing spatial sensitivities, the measured spectra differ greatly for different diagnostics. In plasmas...

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...

Fast-ion D-alpha measurements at ASDEX Upgrade