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Physics Of Off Axis Electron Cyclotron Current Drive
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Book Synopsis Physics of Off-Axis Electron Cyclotron Current Drive by :
Download or read book Physics of Off-Axis Electron Cyclotron Current Drive written by and published by . This book was released on 2002 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron cyclotron current drive is a key option for driving current off-axis in a tokamak, as needed for example for current profile control or for suppression of neoclassical tearing modes. Experiments in DIII-D at low beta have shown that the partial cancellation of the Fisch-Boozer co-current by the Ohkawa counter-current can cause strong deterioration of the current drive efficiency at larger minor radius. However, more recent experiments at higher power have shown that the loss in efficiency can be mostly recovered if the target plasma has higher electron beta, [beta]{sub e}. The improvement in efficiency with beta can be understood from a theoretical viewpoint by applying the Fokker-Planck code CQL3D, which shows excellent agreement with experiment over a wide range of parameters, thereby validating the code as an effective means of predicting the ECCD.
Book Synopsis ELECTRON CYCLOTRON CURRENT DRIVE IN DIII-D by :
Download or read book ELECTRON CYCLOTRON CURRENT DRIVE IN DIII-D written by and published by . This book was released on 2003 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: A271 ELECTRON CYCLOTRON CURRENT DRIVE IN DIII-D: EXPERIMENT AND THEORY. Experiments on the DIII-D tokamak in which the measured off-axis electron cyclotron current drive has been compared systematically to theory over a broad range of parameters have shown that the Fokker-Planck code CQL3D provides an excellent model of the relevant current drive physics. This physics understanding has been critical in optimizing the application of ECCD to high performance discharges, supporting such applications as suppression of neoclassical tearing modes and control and sustainment of the current profile.
Book Synopsis Electron Cyclotron Emission And Electron Cyclotron Heating (Ec12), Proceedings Of The 12th Joint Workshop by : Gerardo Giruzzi
Download or read book Electron Cyclotron Emission And Electron Cyclotron Heating (Ec12), Proceedings Of The 12th Joint Workshop written by Gerardo Giruzzi and published by World Scientific. This book was released on 2003-02-21 with total page 613 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 12th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating (EC-12) was held in Aix-en-Provence (France) from May 13 to 16, 2002. This workshop was concerned with the interaction of electromagnetic waves and hot plasmas, a subject of great importance in the framework of research on controlled thermonuclear fusion. Using as a fuel a mixture of deuterium and tritium, which can be extracted from sea water, this is a very promising way to develop an intrinsically safe reactor. The workshop gathered approximately one hundred specialists in the production, use and theory of millimetre waves for heating and diagnostics of fusion plasmas.
Book Synopsis DETAILED MEASUREMENTS OF THE ELECTRON CYCLOTRON CURRENT DRIVE EFFICIENCY ON DIIID. by :
Download or read book DETAILED MEASUREMENTS OF THE ELECTRON CYCLOTRON CURRENT DRIVE EFFICIENCY ON DIIID. written by and published by . This book was released on 2002 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron cyclotron current drive (ECCD) experiments on the DIII-D tokamak are solidifying the physics basis for localized, off-axis current drive, the goal being to validate a predictive model for ECCD. The ECCD profiles are determined from the magnetic field pitch angles measured by motional Stark effect (MSE) polarimetry. The measured ECCD switches from the co to the counter direction as the toroidal injection angle is varied with a profile width that is in accordance with ray tracing calculations. Tests of electron trapping in low beta plasmas show that the ECCD efficiency decreases rapidly as the deposition is moved off-axis and towards the outboard side of the plasma, but the detrimental effects of electron trapping on the current drive are greatly reduced in high beta plasmas. Overall, the measured ECCD is in good agreement with theoretical calculations using a quasilinear Fokker-Planck code over a wide range of injection angles and plasma parameters.
Book Synopsis Electron Cyclotron Emission And Electron Cyclotron Resonance Heating (Ec-15) - Proceedings Of The 15th Joint Workshop (With Cd-rom) by : John Lohr
Download or read book Electron Cyclotron Emission And Electron Cyclotron Resonance Heating (Ec-15) - Proceedings Of The 15th Joint Workshop (With Cd-rom) written by John Lohr and published by World Scientific. This book was released on 2009-04-15 with total page 583 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings present the latest results in electron cyclotron emission, heating and current drive, with an emphasis on the physics and technology of Electron Cyclotron Emission, Electron Cyclotron Heating and Electron Cyclotron Current Drive applied to magnetic fusion research. The field is a key element in the development of fusion power and the ITER project now under construction.
Book Synopsis Proceedings of the Fifteenth Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating by : John Lohr
Download or read book Proceedings of the Fifteenth Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating written by John Lohr and published by World Scientific. This book was released on 2009 with total page 583 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings present the latest results in electron cyclotron emission, heating and current drive, with an emphasis on the physics and technology of Electron Cyclotron Emission, Electron Cyclotron Heating and Electron Cyclotron Current Drive applied to magnetic fusion research. The field is a key element in the development of fusion power and the ITER project now under construction.
Book Synopsis Ec-10: Proceedings Of The 10th Joint Workshop On Electron Cyclotron Emission And Electron Cyclotron Resonance by : Tony Donne
Download or read book Ec-10: Proceedings Of The 10th Joint Workshop On Electron Cyclotron Emission And Electron Cyclotron Resonance written by Tony Donne and published by World Scientific. This book was released on 1998-02-13 with total page 661 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this proceedings, physicists from all over the world discussed the state-of-the-art in the field of Electron Cyclotron Emission (ECE) and Electron Cyclotron Resonance Heating (ECRH) in great detail. Papers have been presented in the field of millimeter wave technology for ECE and ECRH, theory of propagation and absorption of EC waves in plasmas, EC current drive theory and experiments, nonlinear effects, ECRH sources, transmission line technology, experiments and plans. Comprehensive summaries on the main topics of the EC-10 workshop (theory, diagnostics, experiments, techniques) have been written by world renowned experts. The proceedings is indispensable for anyone who is working in the field of ECE and ECRH.
Book Synopsis Electron Cyclotron Emission And Electron Cyclotron Resonance Heating (Ec-16) - Proceedings Of The 16th Joint Workshop (With Cd-rom) by : Ronald Prater
Download or read book Electron Cyclotron Emission And Electron Cyclotron Resonance Heating (Ec-16) - Proceedings Of The 16th Joint Workshop (With Cd-rom) written by Ronald Prater and published by World Scientific. This book was released on 2011-02-21 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume, the sixteenth in a biannual series, presents a snapshot of the state of current research worldwide on Electron Cyclotron Emission (ECE) and Electron Cyclotron Resonance Heating (ECRH) and related technologies. The papers address the physics, both theory and experiment, of ECE and ECRH. The technologies of high power millimeter-wave sources — gyrotrons — and transmission lines and launchers are included. The focus is on physics and technology relevant to the research and development of nuclear fusion.
Book Synopsis Electron Cyclotron Emission and Electron Cyclotron Resonance Heating (EC-16) by : Ronald Prater
Download or read book Electron Cyclotron Emission and Electron Cyclotron Resonance Heating (EC-16) written by Ronald Prater and published by World Scientific. This book was released on 2011 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume, the sixteenth in a biannual series, presents a snapshot of the state of current research worldwide on Electron Cyclotron Emission (ECE) and Electron Cyclotron Resonance Heating (ECRH) and related technologies. The papers address the physics, both theory and experiment, of ECE and ECRH. The technologies of high power millimeter-wave sources - gyrotrons - and transmission lines and launchers are included. The focus is on physics and technology relevant to the research and development of nuclear fusion.
Book Synopsis Electron Cyclotron Current Drive by the Ohkawa Method in the Presence of Bootstrap Current by : Joan Decker
Download or read book Electron Cyclotron Current Drive by the Ohkawa Method in the Presence of Bootstrap Current written by Joan Decker and published by . This book was released on 2003 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: In high temperature tokamak confined plasmas, electron cyclotron current drive (ECCD) entails a competition between current drive by the Ohkawa mechanism (OKM) and the Fisch-Boozer mechanism (FBM). We have shown recently that the OKM of current drive (OKCD) is more suitable for effectively generating significant current at positions off the magnetic axis, on the outboard low field side (LFS), of interest to various advanced tokamak operation scenarios, and STs, requiring current profile control. At such positions the bootstrap current (BC) is also appreciable and OKCD must be evaluated self-consistently in the presence of BC; we present results from such a self-consistent formulation and evaluate the synergism between OKCD and BC.
Book Synopsis PHYSICS OF ELECTRON CYCLOTRON CURRENT DRIVE ON DIII-D. by :
Download or read book PHYSICS OF ELECTRON CYCLOTRON CURRENT DRIVE ON DIII-D. written by and published by . This book was released on 2002 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: OAK A271 PHYSICS OF ELECTRON CYCLOTRON CURRENT DRIVE ON DIII-D. Recent experiments on the DIII-D tokamak have focused on determining the effect of trapped particles on the electron cyclotron current drive (ECCD) efficiency. The measured ECCD efficiency increases as the deposition location is moved towards the inboard midplane or towards smaller minor radius for both co and counter injection. The measured ECCD efficiency also increases with increasing electron density and/or temperature. The experimental ECCD is compared to both the linear theory (Toray-GA) as well as a quasilinear Fokker-Planck model (CQL3D). The experimental ECCD is found to be in better agreement with the more complete Fokker-Planck calculation, especially for cases of high rf power density and/or loop voltage.
Book Synopsis Proceedings of the Fifteenth Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating by : John Lohr
Download or read book Proceedings of the Fifteenth Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating written by John Lohr and published by World Scientific. This book was released on 2009 with total page 583 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings present the latest results in electron cyclotron emission, heating and current drive, with an emphasis on the physics and technology of Electron Cyclotron Emission, Electron Cyclotron Heating and Electron Cyclotron Current Drive applied to magnetic fusion research. The field is a key element in the development of fusion power and the ITER project now under construction.
Book Synopsis Ec-9: Proceedings Of The Ninth Joint Workshop On Electron Cyclotron Emission And Electron Cyclotron Heating by : John Lohr
Download or read book Ec-9: Proceedings Of The Ninth Joint Workshop On Electron Cyclotron Emission And Electron Cyclotron Heating written by John Lohr and published by World Scientific. This book was released on 1995-11-07 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt: The conference proceedings will include the papers of approximately 50 key specialists from most of the world's major fusion laboratories, including the European Community, the U.S., Russia and the PRC. The unifying themes are the emission of electron cyclotron waves by high temperature plasmas and the reciprocal process, absorption, which can be used for heating, non inductive current drive and diagnostic purposes.
Book Synopsis Controlled Fusion and Plasma Physics by : Kenro Miyamoto
Download or read book Controlled Fusion and Plasma Physics written by Kenro Miyamoto and published by CRC Press. This book was released on 2006-10-23 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: Resulting from ongoing, international research into fusion processes, the International Tokamak Experimental Reactor (ITER) is a major step in the quest for a new energy source.The first graduate-level text to cover the details of ITER, Controlled Fusion and Plasma Physics introduces various aspects and issues of recent fusion research activities through the shortest access path. The distinguished author breaks down the topic by first dealing with fusion and then concentrating on the more complex subject of plasma physics. The book begins with the basics of controlled fusion research, followed by discussions on tokamaks, reversed field pinch (RFP), stellarators, and mirrors. The text then explores ideal magnetohydrodynamic (MHD) instabilities, resistive instabilities, neoclassical tearing mode, resistive wall mode, the Boltzmann equation, the Vlasov equation, and Landau damping. After covering dielectric tensors of cold and hot plasmas, the author discusses the physical mechanisms of wave heating and noninductive current drive. The book concludes with an examination of the challenging issues of plasma transport by turbulence, such as magnetic fluctuation and zonal flow. Controlled Fusion and Plasma Physics clearly and thoroughly promotes intuitive understanding of the developments of the principal fusion programs and the relevant fundamental and advanced plasma physics associated with each program.
Book Synopsis PHYSICS OF ELCTRON CYCLOTRON CURRENT DRIVE ON DIII-D. by :
Download or read book PHYSICS OF ELCTRON CYCLOTRON CURRENT DRIVE ON DIII-D. written by and published by . This book was released on 2002 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: OAK A271 PHYSICS OF ELCTRON CYCLOTRON CURRENT DRIVE ON DIII-D. Recent experiments on the DIII-D tokamak have focused on determining the effect of trapped particles on the electron cyclotron current drive (ECCD) efficiency. The measured ECCD efficiency increases as the deposition location is moved towards the inboard midplane or towards smaller minor radius for both co and counter injection. The measured ECCD efficiency also increases with increasing electron density and/or temperature. The experimental ECCD is compared to both the linear theory (Toray-GA) as well as a quasilinear Fokker-Planck model (CQL3D). The experimental ECCD is found to be in better agreement with the more complete Fokker-Planck calculation, especially for cases of high rf power density and/or loop voltage. The narrow width of the measured ECCD profile is consistent with only low levels of radial transport for the current carrying electrons.
Book Synopsis Electron Cyclotron Heating and Current Drive by :
Download or read book Electron Cyclotron Heating and Current Drive written by and published by . This book was released on 1995 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron cyclotron (EC) power has technological and physics advantages for heating and current drive in a tokamak reactor, and advances in source development make it credible for applications in ITER. Strong single pass absorption makes heating to ignition particularly simple. The optimized EC current drive (ECCD) efficiency ({l_angle}n{r_angle}IR/P) shows a linear temperature scaling at temperatures up to (approximately) 15 keV. For temperatures above 30 keV, the efficiency saturates at approximately 0.3·102° A/(m2W) for a frequency of 220 GHz in an ITER target plasma with toroidal field of 6 T, due primarily to harmonic overlap [G.R. Smith et al., Phys. Fluids 30 3633 (1987)] and to a lesser extent due to limitations arising from relativistic effects [N.J. Fisch, Phys. Rev. A 24 3245 (1981)]. The same efficiency can also be obtained at 170 GHz for the same plasma equilibrium except that the magnetic field is reduced to (170/220) x 6 T = 4.6 T. The ECCD efficiencies are obtained with the comprehensive 3D, bounce-averaged Fokker-Planck CQL3D codes [R.W. Harvey and M.G. McCoy, Proc. IAEA TCM/Advances in Simulation and Modeling in Thermonuclear Plasmas 1992, Montreal], and BANDIT3D [M.R. O'Brien, M. Cox, C.D. Warrick, and F.S. Zaitsev, ibid.].
Book Synopsis Nuclear Fusion And Plasma Physics - Proceedings Of The International Summer School by : Y P Huo
Download or read book Nuclear Fusion And Plasma Physics - Proceedings Of The International Summer School written by Y P Huo and published by World Scientific. This book was released on 1995-08-31 with total page 459 pages. Available in PDF, EPUB and Kindle. Book excerpt: The lectures given in the Summer School covered most of the important topics in controlled nuclear fusion and high temperature plasma physics. The topics are as follows: tokamak research, stellarator physics, transport and confinement of high temperature plasma, plasma-wall interaction and edge plasma physics, heating and current drive, diagnostics and general plasma theory.
