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Author: Jo-Han Yu
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Millimeter-wave imaging diagnostic instruments developed by Davis Millimeter Research Center (DMRC) have made important contributions to fusion science and have been adopted at major fusion facilities worldwide: Electron cyclotron emission (ECE) imaging is a passive radiometric technique that measures electron temperature fluctuations; and microwave imaging reflectometry (MIR) is an active radar imaging technique that measures electron density fluctuations. These instruments have been comprised with the combination of discrete waveguide components and board-level surface mount components employing quasi-optical coupling in the front-end system. Aim to implement ultra-wideband observation for visualizing the 2-D images of fusion plasma in the old days, the conventional passive down-converting mixer mounted on the printed board antenna with mini lens offers the most reliable method therefore becomes the first generation of above techniques. Such technology has been widely applied and has provided crucial contributions on sawtooth, Alfven eigenmodes, and ELMs. Until recent, existing systems have been installed in several major magnetic confinement devices around the world, such as DIII-D, KSTAR, ASDEX-U, EAST, HL-2A, TEXTOR and J-TEXT. Nowadays, advances in device fabrication and the scaling of feature size have recently extended the maximum operating frequency of integrated circuits considerably in excess of a hundred gigahertz. The groundbreaking improvement on the electronic device, a multi-function instrumentation can be implemented by integrating the entire front-end system on a single chip, which is known as system-on-chip (SoC) technique. In this dissertation, the author will introduce the system from the previous hardware limitations to the system-on-chip advancement for fusion science applications and will deliver the details of the waveguide horn antenna array with single MMIC receiver module. Fusion plasma diagnostics require operation at specific frequencies with >20 GHz bandwidth limiting the usefulness of commercial products. The in-house designed receiver chip offer >30 dB signal amplification over 20 GHz bandwidth with
Author: Jo-Han Yu
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Millimeter-wave imaging diagnostic instruments developed by Davis Millimeter Research Center (DMRC) have made important contributions to fusion science and have been adopted at major fusion facilities worldwide: Electron cyclotron emission (ECE) imaging is a passive radiometric technique that measures electron temperature fluctuations; and microwave imaging reflectometry (MIR) is an active radar imaging technique that measures electron density fluctuations. These instruments have been comprised with the combination of discrete waveguide components and board-level surface mount components employing quasi-optical coupling in the front-end system. Aim to implement ultra-wideband observation for visualizing the 2-D images of fusion plasma in the old days, the conventional passive down-converting mixer mounted on the printed board antenna with mini lens offers the most reliable method therefore becomes the first generation of above techniques. Such technology has been widely applied and has provided crucial contributions on sawtooth, Alfven eigenmodes, and ELMs. Until recent, existing systems have been installed in several major magnetic confinement devices around the world, such as DIII-D, KSTAR, ASDEX-U, EAST, HL-2A, TEXTOR and J-TEXT. Nowadays, advances in device fabrication and the scaling of feature size have recently extended the maximum operating frequency of integrated circuits considerably in excess of a hundred gigahertz. The groundbreaking improvement on the electronic device, a multi-function instrumentation can be implemented by integrating the entire front-end system on a single chip, which is known as system-on-chip (SoC) technique. In this dissertation, the author will introduce the system from the previous hardware limitations to the system-on-chip advancement for fusion science applications and will deliver the details of the waveguide horn antenna array with single MMIC receiver module. Fusion plasma diagnostics require operation at specific frequencies with >20 GHz bandwidth limiting the usefulness of commercial products. The in-house designed receiver chip offer >30 dB signal amplification over 20 GHz bandwidth with
Author: Duixian Liu
Publisher: John Wiley & Sons
ISBN: 9780470742952
Category : Technology & Engineering
Languages : en
Pages : 850
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Book Description
This book explains one of the hottest topics in wireless and electronic devices community, namely the wireless communication at mmWave frequencies, especially at the 60 GHz ISM band. It provides the reader with knowledge and techniques for mmWave antenna design, evaluation, antenna and chip packaging. Addresses practical engineering issues such as RF material evaluation and selection, antenna and packaging requirements, manufacturing tolerances, antenna and system interconnections, and antenna One of the first books to discuss the emerging research and application areas, particularly chip packages with integrated antennas, wafer scale mmWave phased arrays and imaging Contains a good number of case studies to aid understanding Provides the antenna and packaging technologies for the latest and emerging applications with the emphases on antenna integrations for practical applications such as wireless USB, wireless video, phase array, automobile collision avoidance radar, and imaging
Author: Kenneth J. Button
Publisher:
ISBN:
Category : Millimeter wave devices
Languages : en
Pages : 272
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Book Description
Author: Xing Hu
Publisher:
ISBN: 9780355149487
Category :
Languages : en
Pages :
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Book Description
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.
Author: Mazzocchi, Francesco
Publisher: KIT Scientific Publishing
ISBN: 3731511819
Category : Technology & Engineering
Languages : en
Pages : 212
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Book Description
This work aimed at designing, studying and producing the first prototypes of KIDs tailored for fusion plasma polarimetric diagnostics. Diamond was considered for the first time as substrate material for low-temperature superconducting detectors given its unmatched optical, radiation hardness and thermal qualities, properties necessary for working environments potentially saturated with radiation. This work represents a first step toward the optimization and final application of this technology.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Author:
Publisher:
ISBN:
Category : Lasers in plasma diagnostics
Languages : en
Pages : 432
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ISBN:
Category : Electrical engineering
Languages : en
Pages : 1948
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Author:
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ISBN:
Category :
Languages : en
Pages : 724
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Author: United States. Energy Research and Development Administration. Technical Information Center
Publisher:
ISBN:
Category : Force and energy
Languages : en
Pages : 1680
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