Laser-Plasma-based Detection of Local Plasma Density for Diagnostics of Tokamak Plasma

M.S. Hur

Detecting local plasma density in Tokamak plasma is important. Existing methods mostly yield space-integrated data only and inversion process is required to reconstruct the density distribution. There have been several years efforts to devise laser-plasma-based diagnostic concepts for probing local information. There are several kinds of ideas. First the laser-plasma system is used for generation of high-power THz pulse which can be used as a probe pulse. The frequency range of THz is advantageous in coupling with Tokamak plasmas. The THz-probe idea was advanced to focused Raman-backscatter for local density detection. Most recently, the idea of directly stimulating the local plasma oscillation at a desired position of the target plasma itself by colliding electromagnetic pulses. In this talk, those several ideas are presented with pro-and-cones of each of them along with discussion on their potential as future diagnostic methods.