Bulletin of the American Physical Society
49th Annual Meeting of the Division of Plasma Physics
Volume 52, Number 11
Monday–Friday, November 12–16, 2007; Orlando, Florida
Session CP8: Poster Session II: Reconnection and Non-Neutral I; Spheromaks and MCX; MFC Diagnostics; Simulation: Algorithm; Simulation: Kinetic/Edge
Monday, November 12, 2007
Rosen Centre Hotel Room: Grand Ballroom, 2:00pm - 5:00pm
Abstract ID: BAPS.2007.DPP.CP8.78
Abstract: CP8.00078 : Density fluctuation measurements with the microwave imaging reflectometry on TPE-RX*
Preview Abstract Abstract
(Grad. Univ. Adv. Studies)
Electron density fluctuation in a large reversed-field pinch device TPE-RX has been investigated by using the microwave imaging reflectometry (MIR) system for the first time. This system illuminates the TPE-RX plasma with the 20 GHz microwave beam in O-mode and measures the reflection by a two dimensional detector array with spatial resolution of 4cm and temporal resolution of 1ms. Each detector signal has 3 components, such as the amplitude, the in-phase (I) and the quadrature (Q). The reflection surface motion is obtained from the rotation of the I-Q components of the MIR signals. Cross-spectral method is used for the analysis of the amplitude of the reflected wave. We investigate four different types of RFP plasma, such as the quasi-single-helicity (QSH) plasma, the pulsed poloidal current drive (PPCD) plasma, the sawtoothing high theta plasma and the NBI heated plasma. The fluctuations indicate that the plasma turbulence is dominated by the low frequency and long wavelength fluctuation components and the statistical dispersion relation shows the typical electron drift wave characteristics.
*This work is supported by NIFS with No. KEIN0021 and No. ULPP525.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.DPP.CP8.78
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