Synthetic Thomson scattering

[eldond]

Thomson scattering just samples electron temperature and electron density at small volumes (practically points) for very short integration windows (8 nanoseconds at DIII-D, so basically instantaneous). Just pick the R,Z coordinates and pull values out of the SOLPS model. If only the real thing were that easy.

Being a laser-aided diagnostic, the measurement volumes will lie along a straight line in 3-space, which could project to a curve in the R-Z half plane.

The measurement volumes will probably be a few mm to 1 cm long, and the laser beam radius will probably be a few mm. It is probably not necessary to model the fall off of laser power with radius (although the energy distribution will be close to Gaussian if the laser's mode structure is clean). The ends of the measurement volumes will technically be slanted and not parallel in general, but this is probably unnecessary detail at this point.

Just start with point measurements and upgrade later?

from http://dx.doi.org/10.1063/1.4738656

SynthDiag list on SPARC sharepoint