Abstract
To investigate the fast ion behavior, a fast ion D-alpha (FIDA) diagnostic system has been planned and is presently under development on Experimental Advanced Superconducting Tokamak. The greatest challenges for the design of a FIDA diagnostic are its extremely low intensity levels, which are usually significantly below the continuum radiation level and several orders of magnitude below the bulk-ion thermal charge-exchange feature. Moreover, an overlaying Motional Stark Effect (MSE) feature in exactly the same wavelength range can interfere. The simulation of spectra code is used here to guide the design and evaluate the diagnostic performance. The details for the parameters of design and hardware are presented.
Highlights
In present day fusion devices, with the development of high power external heating systems, such as neutral beam injection and wave heating at radio frequencies, the study of the fast-ion behavior becomes more important to understand their confinement
One powerful diagnostic method is the fast-ion D-alpha (FIDA) technique, which is based on charge-exchange between injected neutral beam particles and the high energetic deuterium ions, similar as the measurements of energetic helium ions reported on Joint European Torus (JET) in 1993.1 Since it was first successfully exploited in Doublet-III-D (DIII-D),2 it has been applied to several tokamaks (National Spherical Torus Experiment (NSTX);3 Tokamak EXperiment for Technology Oriented Research (TEXTOR);4 Axially Symmetric Divertor EXperiment Upgrade (ASDEX-U)5)
Similar experiments based on Fast Ion Charge eXchange Spectroscopy (FICXS) have been applied on Large Helical Device (LHD)
Summary
In present day fusion devices, with the development of high power external heating systems, such as neutral beam injection and wave heating at radio frequencies, the study of the fast-ion behavior becomes more important to understand their confinement. One powerful diagnostic method is the fast-ion D-alpha (FIDA) technique, which is based on charge-exchange between injected neutral beam particles and the high energetic deuterium ions, similar as the measurements of energetic helium ions reported on Joint European Torus (JET) in 1993.1 Since it was first successfully exploited in Doublet-III-D (DIII-D), it has been applied to several tokamaks (National Spherical Torus Experiment (NSTX); Tokamak EXperiment for Technology Oriented Research (TEXTOR); Axially Symmetric Divertor EXperiment Upgrade (ASDEX-U)). To investigate the fast ion behavior on EAST (Experimental Advanced Superconducting Tokamak), FIDA diagnostic system has been planned and is presently under development.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
