Download or read book Next Generation of Electron Cyclotron Emission Imaging ECEI Instrument for the J TEXT Tokamak and Data Processing and Visualization written by Jinhua Cao and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation work, an Electron Cyclotron Emission Imaging (ECEI) instrument has been developed for electron temperature fluctuation visualization measurements in the experimental fusion plasma device on the J-TEXT (located at Huazhong University of Science and Technology in Wuhan, China). The ECEI instrument provides centimeter level spatial resolution and microsecond level temporal resolution. Two observation windows (128 pixel-channel) are used to image separate radial depths in the plasma. The 256-channel system was successfully installed on J-TEXT in 2019. An intelligent control module has been developed and applied on one million frame per second (SPS) imaging system. The multiple radial zoom options are used to measure large radial coherent structures and fine structures with high resolution, and which are able to switch flexibly. Signal levels are optimized by the feedback control to match the dynamic measurement range facing different plasma scenarios. A system configuration logfile can be saved. In addition, the preset and manual training options are available for operator to calibrate the system before each experiment. A large package of raw data (36 GB daily) will be generated by the high spatial and temporal resolution ECEI diagnostic system. To address this issue, a general graphical analysis process routine has been developed for 2D temperature fluctuation profiles for ECEI. The ECEI analysis program has been developed and released by UC Davis for the J-TEXT ECEI system. Both narrowband and broadband MHD instabilities are clearly presented in the ECEI frequency spectra. The characteristics of MHD evolution are clearly described by 2D electron temperature animations. Artificial intelligence technology has been applied to automatically detect and separate each of the MHD modes. The primary algorithms used are OpenCV Canny Edge Detection and Depth-first search (DFS). The machine learning algorithm of Random Forest has been applied to classify the so-called edge localized modes.

Download or read book The Next Generation of Electron Cyclotron Emission Imaging ECEI Diagnostics written by Peiling Zhang and published by . This book was released on 2008 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design and Implementation of an Electron Cyclotron Emission Imaging Diagnostic for the TEXTOR Tokamak written by Benjamin John Tobias and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The advancement of magnetic confinement nuclear fusion toward a viable source of energy on the scale of today's conventional power plants requires the development of a broad range of instruments for use in present day experimental fusion reactors. A class of plasma diagnostic systems that make use of electromagnetic emission from free electrons includes Electron Cyclotron Emission Imaging (ECEI), conceived at the University of California at Davis as an extension of ECE radiometry. A new ECEI system with unique capabilities is designed and realized for use on the Tokamak Experiment for Technology Oriented Research (TEXTOR), a toroidal plasma confinement device located at Forschungszentrum Jülich, Germany. The TEXTOR ECEI system is capable of 128 channel (16 vertical by 8 radial) 2-D imaging of electron temperature fluctuations below 1% in the poloidal plane on [mu]s time scales. Advancements in a variety of millimeter wave technologies are discussed, including the development of dual-dipole antennas and miniature elliptical substrate lenses, planar quasi-optical notch filters, dichroic plate high-pass filters, dielectric film beamsplitters, RF electronics for double down-conversion heterodyne frequency mixing and signal detection, and optical coupling of electron cyclotron emission signals and local oscillator power. Particular emphasis is given to the development of a new heuristic for the design of optical coupling systems for millimeter wave imaging arrays which has resulted in the realization of the feature of independent vertical zoom, new to ECEI, by which the vertical extent of the plasma image may be continuously varied from 20 to 35 cm. The new TEXTOR ECEI system is compared in laboratory characterization to the legacy ECEI system, which it replaced in 2008, to reveal dramatic improvements in image quality, optical performance, and system noise temperature. Finally, the installation of this diagnostic is discussed and data obtained during commissioning are presented. A look forward to continuing projects in the field of ECEI reveals an exciting future for the technology with growing international collaboration and invaluable contributions to the effort to develop energy resources that may some day eliminate mankind's dependence on fossil fuels.

Download or read book Two Dimensional Electron Cyclotron Emission Imaging Study of Electron Temperature Profiles and Fluctuations in Tokamak Plasmas written by Bihe Deng and published by . This book was released on 1999 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Electron Cyclotron Emission Measurements on the Texas Experimental Tokamak written by Max Eugene Austin and published by . This book was released on 1992 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analysis of Non thermal Electron Cyclotron Emission During Electron Cyclotron Current Drive Experiments on the DIII D Tokamak written by Scott J. Janz and published by . This book was released on 1992 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Assessment of the Impact Cyclotron Emission on the Performanceof Next generation Tokamaks in the Presence of an Absorbing Wall written by K. Borrass and published by . This book was released on 1988 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Electron Cyclotron Emission from Tokamak Plasmas written by Robert Mathieu Johan Sillen and published by . This book was released on 1986 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigations of Electron Cyclotron Emission from a Tokamak Plasma written by David John Campbell and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High Spatial Resolution Upgrade of the Electron Cyclotron Emission Radiometer for the DIII D Tokamak written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The 40-channel DIII-D electron cyclotron emission (ECE) radiometer provides measurements of Te(r, t) at the tokamak midplane from optically thick, second harmonic X-mode emission over a frequency range of 83-130 GHz. Heterodyning divides this frequency range into three 2-18 GHz intermediate frequency (IF) bands. The frequency spacing of the radiometer's channels results in a spatial resolution of ~1-3 cm, depending on local magnetic field and electron temperature. A new high resolution subsystem has been added to the DIII-D ECE radiometer to make sub-centimeter (0.6-0.8 cm) resolution Te measurements. The high resolution subsystem branches off from the regular channels' IF bands and consists of a microwave switch to toggle between IF bands, a switched filter bank for frequency selectivity, an adjustable local oscillator and mixer for further frequency down-conversion, and a set of eight microwave filters in the 2-4 GHz range. We achieved a higher spatial resolution through the use of a narrower (200 MHz) filter bandwidth and closer spacing between the filters' center frequencies (250 MHz). This configuration allows for full coverage of the 83-130 GHz frequency range in 2 GHz bands. Depending on the local magnetic field, this translates into a "zoomed-in" analysis of a ~2-4 cm radial region. These high resolution channels will be most useful in the low-field side edge region where modest Te values (1-2 keV) result in a minimum of relativistic broadening. Some expected uses of these channels include mapping the spatial dependence of Alfven eigenmodes, geodesic acoustic modes, and externally applied magnetic perturbations. Initial Te measurements, which demonstrate that the desired resolution is achieved, is presented.

Download or read book Assessment of the Impact of Cyclotron Emission on the Performance of Next generation Tokamaks in the Presence of an Absorbing Wall written by Kurt Borrass and published by . This book was released on 1988 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fundamental Electron Cyclotron Emission in the Apex Tokamak written by Stephen R. Magill and published by . This book was released on 1979 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Submillimeter Wave Electron Cyclotron Emission Diagnostic for the Alcator C Mod Tokamak written by Thomas C. Hsu and published by . This book was released on 1994 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Electron Cyclotron Emissions Fluctuation Diagnostic on JET and PBX M Tokamaks written by Ali Mohammad Zolfaghari and published by . This book was released on 1994 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Principles of Plasma Diagnostics written by I. H. Hutchinson and published by Cambridge University Press. This book was released on 2005-07-14 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a systematic introduction to the physics of plasma diagnostics measurements. It develops from first principles the concepts needed to plan, execute and interpret plasma measurements, making it a suitable book for graduate students and professionals with little plasma physics background. The book will also be a valuable reference for seasoned plasma physicists, both experimental and theoretical, as well as those with an interest in space and astrophysical applications. This second edition is thoroughly revised and updated, with new sections and chapters covering recent developments in the field.

Download or read book Nuclear Fusion written by C.M. Braams and published by CRC Press. This book was released on 2002-06-20 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fusion research started over half a century ago. Although the task remains unfinished, the end of the road could be in sight if society makes the right decisions. Nuclear Fusion: Half a Century of Magnetic Confinement Fusion Research is a careful, scholarly account of the course of fusion energy research over the past fifty years. The authors outline the different paths followed by fusion research from initial ignorance to present understanding. They explore why a particular scheme would not work and why it was more profitable to concentrate on the mainstream tokamak development. The book features descriptive sections, in-depth explanations of certain physical and technical issues, scientific terms, and an extensive glossary that explains relevant abbreviations and acronyms.

Download or read book Driving Scientific and Engineering Discoveries Through the Convergence of HPC Big Data and AI written by Jeffrey Nichols and published by Springer Nature. This book was released on 2020-12-22 with total page 555 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the revised selected papers of the 17th Smoky Mountains Computational Sciences and Engineering Conference, SMC 2020, held in Oak Ridge, TN, USA*, in August 2020. The 36 full papers and 1 short paper presented were carefully reviewed and selected from a total of 94 submissions. The papers are organized in topical sections of computational applications: converged HPC and artificial intelligence; system software: data infrastructure and life cycle; experimental/observational applications: use cases that drive requirements for AI and HPC convergence; deploying computation: on the road to a converged ecosystem; scientific data challenges. *The conference was held virtually due to the COVID-19 pandemic.