Simultaneous Microwave Imaging System for Density and Temperature Fluctuation Measurements on TEXTOR
Authors: H. Park, E. Mazzucato, T. Munsat, C.W. Domier, M. Johnson, N.C. Luhmann, Jr., J. Wang, Z. Xia, I.G.J. Classen, A.J.H. Donné, and M.J. van de Pol
Date of PPPL Report: May 2004
Published in: Rev. Sci. Instrum. 75:10 (October 2004) 3987-3992;
Presented at the 15th Topical Conference on High-temperature Plasma Diagnostics (19-22 April 2004, San Diego, CA).
Diagnostic systems for fluctuation measurements in plasmas have, of necessity, evolved from simple 1-D systems to multi-dimensional systems due to the complexity of the MHD and turbulence physics of plasmas illustrated by advanced numerical simulations. Using the recent significant advancements in millimeter wave imaging technology, Microwave Imaging Reflectometry (MIR) and Electron Cyclotron Emission Imaging (ECEI), simultaneously measuring density and temperature fluctuations, are developed for TEXTOR. The MIR system was installed on TEXTOR and the first experiment was performed in September, 2003. Subsequent MIR campaigns have yielded poloidally resolved spectra and assessments of poloidal velocity. The new 2-D ECE Imaging system (with a total of 128 channels), installed on TEXTOR in December, 2003, successfully captured a true 2-D images of Te fluctuations of m=1 oscillation ("sawteeth") near the q~1 surface for the first time.