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Microwave Scattering System Design for (rho)(sub i) e-Scale Turbulence Measurements on NSTX.

DE2004828006

Publication Date	2004
Personal Author	Smith, D. R.; Mazzucato, E.; Johnson, M.; Munsat, T.; Park, H.
Page Count	18
Abstract	Despite suppression of (rho)(sub i)-scale turbulent fluctuations, electron thermal transport remains anomalous in NSTX. For this reason, a microwave scattering system will be deployed to directly observe the w and k spectra of (rho)(sub e)-scale turbulent fluctuations and characterize the eect on electron thermal transport. The scattering system will employ a Gaussian probe beam produced by a high power 280 GHz microwave source. A five-channel heterodyne detection system will measure radial turbulent spectra in the range (k(sub r)) = 0-20 cm(sup-1). Inboard and outboard launch configurations cover most of the normalized minor radius. Improved spatial localization of measurements is achieved with low aspect ratio and high magnetic shear configurations. This paper will address the global design of the scattering system, such as choice of frequency, size, launching system, and detection system.
Keywords	Tokamaks Turbulence Microwaves Aspect ratio Design Detection Electrons Fluctuations Launching Probes Scattering Shear Spectra NSTX devices
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Princeton Univ., NJ. Plasma Physics Lab.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200510

Microwave Scattering System Design for (rho)(sub i) e-Scale Turbulence Measurements on NSTX.

Microwave Scattering System Design for (rho)(sub i) e-Scale Turbulence Measurements on NSTX.
DE2004828006

Publication Date	2004
Personal Author	Smith, D. R.; Mazzucato, E.; Johnson, M.; Munsat, T.; Park, H.
Page Count	18
Abstract	Despite suppression of (rho)(sub i)-scale turbulent fluctuations, electron thermal transport remains anomalous in NSTX. For this reason, a microwave scattering system will be deployed to directly observe the w and k spectra of (rho)(sub e)-scale turbulent fluctuations and characterize the eect on electron thermal transport. The scattering system will employ a Gaussian probe beam produced by a high power 280 GHz microwave source. A five-channel heterodyne detection system will measure radial turbulent spectra in the range (k(sub r)) = 0-20 cm(sup-1). Inboard and outboard launch configurations cover most of the normalized minor radius. Improved spatial localization of measurements is achieved with low aspect ratio and high magnetic shear configurations. This paper will address the global design of the scattering system, such as choice of frequency, size, launching system, and detection system.
Keywords	Tokamaks Turbulence Microwaves Aspect ratio Design Detection Electrons Fluctuations Launching Probes Scattering Shear Spectra NSTX devices
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Princeton Univ., NJ. Plasma Physics Lab.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200510