Plasma Diagnostics Research

Tobin Munsat, Sam Wurzel, William Willcockson, and C. Leland Ellison

section view of the LAMA instrument

Figure 1: Section view of the LAMA instrument.

The Plasma Diagnostics group is working on a number of projects based on measurement and assessment of turbulence and cross-field transport in Field Reversed Configuration (FRC) and other magnetically confined plasmas. This work combines local experiments at CU with collaborations with universities and national laboratories.                                                                                                                                                                                                                                                                                                                                                                                                  

Microwave Imaging Diagnostic Development

microwave optics graphs

Diagnostic development work involves an ongoing collaboration with PPPL, U.C. Davis, and the FOM Institute in The Netherlands to develop a new microwave imaging instrument for simultaneous density and temperature fluctuation measurements in tokamaks. The instrument is a combined Electron Cyclotron Emission Imaging (ECEI) and Microwave Imaging Reflectometer (MIR) system, which is installed on the TEXTOR tokamak. Both subsystems use a shared set of large microwave optics to image the emitting/reflecting layer onto an array of detectors to provide high-resolution, time-resolved measurements.

 

Velocity Fields in edge turbulence images on NSTX

Additional data analysis work by the group includes collaboration with the NSTX spherical torus at PPPL. This research involves the derivation of velocity field maps from time-dependent image sequences produced by the Gas Puff Imaging instrument. This is a diagnostic system which records line-emission from the edge of tokamak plasmas with high spatial and temporal resolution. The velocity-field analysis reveals the dynamics of intermittent structures visible at the plasma periphery.