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Book Microwave Imaging Reflectometry MIR System for Plasma Turbulance Studies

Download or read book Microwave Imaging Reflectometry MIR System for Plasma Turbulance Studies written by Jian Wang and published by . This book was released on 2004 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Laboratory Characterization of an Imaging Reflectometer System

Download or read book Laboratory Characterization of an Imaging Reflectometer System written by Tobin Leo Munsat and published by . This book was released on 2003 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Numerical Study of Microwave Reflectometry in Plasmas with 2D Turbulent Fluctuations

Download or read book Numerical Study of Microwave Reflectometry in Plasmas with 2D Turbulent Fluctuations written by E. Mazzucato and published by . This book was released on 1998 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Synthetic Diagnostic for the Evaluation of New Microwave Imaging Reflectometry System for Large Tokomaks DIII D and KSTAR

Download or read book Synthetic Diagnostic for the Evaluation of New Microwave Imaging Reflectometry System for Large Tokomaks DIII D and KSTAR written by Li Juan Lei and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Microwave Imaging Reflectometry (MIR) systems have been used as diagnostic tools for characterization of fluctuating plasma density in large tokamaks. Such a technique has been implemented on the TEXTOR device [H. Park, et al., Review of Scientific Instruments, 2004] and is being continued on DIII-D and KSTAR. To develop a new MIR system for density fluctuation measurements for DIII-D and KSTAR, one requires an understanding of how to preserve phase information. The current design for an MIR optical system makes use of design tools in free space, which is great for evaluation of port access but not provide significant information when it comes to the plasma region. This thesis describes a numerical study of MIR in the presence of turbulent fluctuations by evaluating the effectiveness in coupling the reflection layer in the full wave region and the detector array in free space with respect to fluctuation levels. A synthetic diagnostic tool making use of 2D full-wave diffractive simulation in full plasma geometry is applied to couple an optical imaging system with different optical arrangements.

Book Microwave Reflectometry for the Study of Density Fluctuations in Tokamak Plasmas

Download or read book Microwave Reflectometry for the Study of Density Fluctuations in Tokamak Plasmas written by and published by . This book was released on 1990 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of small scale density fluctuations on the propagation of electromagnetic waves in an inhomogeneous magnetized plasma in the presence of a cutoff is investigated. It is shown that, provided the fluctuation scale length is greater than the free space wavelength of an incident plane wave, the scattered field is strongly enhanced from fluctuations near the turning point. Numerical results for wave propagation in a tokamak plasma demonstrate the feasibility of reflectometry for the localized measurement of density fluctuations in the range k {sub {perpendicular}} [rho]{sub i} {much lt} 1. 19 refs., 6 figs,

Book Design and Implementation of a Microwave Imaging Reflectometer MIR for the EAST Tokamak

Download or read book Design and Implementation of a Microwave Imaging Reflectometer MIR for the EAST Tokamak written by Xing Hu and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Nuclear fusion is one of the promising ways to generate renewable energy to solve the current energy crisis. However, controlled nuclear fusion with net power gain has not yet been achieved due to the instabilities inside the fusion plasmas. In order to control and eliminate these instabilities, diagnostic tools have been developed to understand the physics. Most of the characteristic frequencies of fusion plasmas fall within the millimeter wave region of the electromagnetic spectrum, which makes microwave imaging systems excellent tools for visualizing the particle activities inside fusion plasmas. There are two types of microwave imaging diagnostic systems developed at the Plasma Diagnostic Group at UC Davis: one is the electron cyclotron emission imaging (ECEI) system, which measures the ECE radiation from the plasma to determine electron temperature fluctuation and the other is the microwave imaging reflectometer (MIR), which injects multi-frequency probing beams into the plasma and measures the reflected beams from different cutoff surfaces to determine the electron density fluctuation. In this dissertation, the hardware setup of both ECEI and MIR systems is discussed. Characterization of the ECEI system for the HL-2A tokamak at Chengdu, China, and the MIR system for the DIII-D tokamak at La Jolla, USA, are given as an introduction to the laboratory testing methods of these microwave imaging systems. The topic of particular emphasis in this dissertation is the development of the latest generation MIR system for the EAST tokamak at Hefei, China. This system consists of 8 radial channels separated by different probing frequencies ranging from 75 to 103 GHz, and 12 vertically separated receiving channels, providing 96 imaging pixels inside the fusion plasma. As an important protection to the receiver system, development of the frequency selective surface based notch filter is discussed. The improved notch filter resonating at 140 GHz for the EAST MIR system has reduced the pass band insertion loss by half while maintaining over 30 dB rejection at the stop band. The implementation of embedded microcontrollers and RF components with serial peripheral interface (SPI) enables the system to be remotely controlled over the Ethernet. Technology advancements for future MIR systems including the CMOS based transmitter on chip and the digital beam forming technology are briefly discussed at the end of this dissertation.