Title :
Calibration of the collective scattering system on NSTX
Author :
Lee, W. ; Mazzucato, E. ; Smith, D.R. ; Park, H.K. ; Domier, C.W. ; Luhmann, N.C., Jr.
Author_Institution :
POSTECH, Pohang, South Korea
Abstract :
A multichannel 280-GHz collective scattering system has been employed to investigate electron gyro-scale density fluctuations in National Spherical Torus Experiment (NSTX) plasmas. The longitudinal scattering volume length, which is the spatial resolution of the scattering measurement, was calculated in tokamak geometry since the targeting wavenumber is greatly affected by the configuration of the magnetic field. An absolute power calibration was performed to determine the power response of the detection system. The results of the scattering length calculation and the power calibration were applied to estimate the density fluctuation levels from the scattering signals measured on NSTX plasmas.
Keywords :
Tokamak devices; plasma fluctuations; plasma transport processes; plasma turbulence; NSTX plasma; National Spherical Torus Experiment; absolute power calibration; electron gyro-scale density fluctuation; electron transport; magnetic field; multichannel collective scattering system; scattering measurement; short scale turbulence; spatial resolution; tokamak geometry; wave number; Calibration; Electrons; Fluctuations; Length measurement; Magnetic field measurement; Plasma density; Plasma measurements; Plasma waves; Scattering; Spatial resolution;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves, 2009. IRMMW-THz 2009. 34th International Conference on
Conference_Location :
Busan
Print_ISBN :
978-1-4244-5416-7
Electronic_ISBN :
978-1-4244-5417-4
DOI :
10.1109/ICIMW.2009.5325541
