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Tae Modes And Mhd Activity In Tftr Dt Plasmas
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Book Synopsis TAE Modes and MHD Activity in TFTR DT Plasmas by :
Download or read book TAE Modes and MHD Activity in TFTR DT Plasmas written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The high power deuterium and tritium experiments on TFTR have produced fusion a parameters similar to those expected on ITER. The achieved[beta][sub[alpha]]/[beta] and the R[triangledown][beta][sub[alpha]] in TFRR D-T shots are 1/2 to 1/3 those predicted in the ITER EDA. Studies of the initial TFTR D-T plasmas find no evidence that the presence of the fast fusion[alpha] population has affected the stability of MHD, with the possible exception of Toroidal Alfven Eigenmodes (TAE's). The initial TFTR DT plasmas had MHD activity similar to that commonly seen in deuterium plasmas. Operation of TFTR at plasma currents of 2.0--2.5 MA has greatly reduced the deleterious effects of MHD commonly observed at lower currents. Even at these higher currents, the performance of TFTR is limited by[beta]-limit disruptions. The effects of MHD on D-T fusion[alpha]'s was similar to effects observed on other fusion products in D only plasmas.
Book Synopsis TAE Modes and MHD Activity in TFTR DT Plasmas by : E. Fredrickson
Download or read book TAE Modes and MHD Activity in TFTR DT Plasmas written by E. Fredrickson and published by . This book was released on 1995 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Coherent Fluctuations in the Initial TFTR D-T Experiments by :
Download or read book Coherent Fluctuations in the Initial TFTR D-T Experiments written by and published by . This book was released on 1995 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The initial operation of TFTR with approximately equal power in the tritium and deuterium neutral beam injectors has resulted in the production of fusion power in excess of 9MW and central [beta]{sub [alpha]}> 0.25%. This [beta]{sub [alpha]} is within a factor of 2--3 of the [beta]{sub {alpha}} in projections of ITER performance. Effects of this {alpha} population on TAE modes, sawteeth and fishbone activity are being searched for. The D-T plasmas are also being studied for evidence of changes in MHD activity which might be attributed to the fast {alpha} population. This paper reports on the activity in the Alfven range of frequencies in the D-T plasmas and on detailed measurements of the MHD activity preceding major disruptions in D-D and D-T.
Book Synopsis First Evidence of Collective Alpha Particle Effect on TAE Modes in the TFTR D-T Experiment by : K. L. Wong
Download or read book First Evidence of Collective Alpha Particle Effect on TAE Modes in the TFTR D-T Experiment written by K. L. Wong and published by . This book was released on 1996 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Observations of Beam Ion Losses in TFTR During TAE Modes and Other MHD Activity by : D. S. Darrow
Download or read book Observations of Beam Ion Losses in TFTR During TAE Modes and Other MHD Activity written by D. S. Darrow and published by . This book was released on 1993 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stability Analysis of Toroidicity-induced Alfven Eigenmodes in TFTR DT Experiments by : G. Y. Fu
Download or read book Stability Analysis of Toroidicity-induced Alfven Eigenmodes in TFTR DT Experiments written by G. Y. Fu and published by . This book was released on 1995 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis First Evidence of Collective Alpha Particle Effect on TAE Modes in the TFTR D-T Experiment by : K. L. Wong
Download or read book First Evidence of Collective Alpha Particle Effect on TAE Modes in the TFTR D-T Experiment written by K. L. Wong and published by . This book was released on 1996 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Toroidal Alfven Eigenmodes in TFTR Deuterium-tritium Plasmas by : R. Nazikian
Download or read book Toroidal Alfven Eigenmodes in TFTR Deuterium-tritium Plasmas written by R. Nazikian and published by . This book was released on 1998 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computational Modeling of Neoclassical and Resistive MHD Tearing Modes in Tokamaks by : Thomas A. Gianakon
Download or read book Computational Modeling of Neoclassical and Resistive MHD Tearing Modes in Tokamaks written by Thomas A. Gianakon and published by . This book was released on 1996 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Alpha-driven TAE Modes at Lowered Ion Temperature in TFTR DT Discharges by : S. J. Zweben
Download or read book Search for Alpha-driven TAE Modes at Lowered Ion Temperature in TFTR DT Discharges written by S. J. Zweben and published by . This book was released on 1995 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis University of Wisconsin Center for Plasma Theory and Computation Report by :
Download or read book University of Wisconsin Center for Plasma Theory and Computation Report written by and published by . This book was released on 1997 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High-. Beta. Operation and MHD (magnetohydrodynamic) Activity on TFTR. by :
Download or read book High-. Beta. Operation and MHD (magnetohydrodynamic) Activity on TFTR. written by and published by . This book was released on 1990 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetohydrodynamic (MHD) activity within three zones (core, half- radius, and edge) of TFTR (Plasma Physics and Controlled Nuclear Fusion Research (1986), (IAEA, Vienna, 1987), Vol. 1, P. 51) tokamak plasmas are discussed. Near the core of the plasma column, sawteeth are often observed. Two types of sawteeth are studied in detail: one with complete, and the other with incomplete magnetic reconnection. Their characteristics are determined by the shape of the q profile. Near the half-radius the m/n = 3/2 and 2/1 resistive ballooning modes are found to correlate with a beta collapse. The pressure and the pressure gradient at the mode rational surface are found to play an important role in stability. MHD activity is also studied at the plasma edge during limiter H-modes. The Edge Localized Mode (ELMs) are found to have a precursor mode with a frequency between 50--200 kHz and a mode number m/n = 1/0. The mode does not show a ballooning structure. While these instabilities have been studied on many other machines, on TFTR the studies have been extended to high pressure (plasma pressure greater than 4 x 105 Pa) and low collisionality. 16 refs., 3 figs.
Book Synopsis Observations of Beam Ion Losses in TFTR During TAE Modes and Other MHD Activity by :
Download or read book Observations of Beam Ion Losses in TFTR During TAE Modes and Other MHD Activity written by and published by . This book was released on 1993 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Direct measurements of fast NBI ion losses have been made near the outer midplane during MHD activity in TFTR. Bursts of beam ion loss are seen coincident with the TAE mode activity. Particles lost during TAE activity are lost at the full injection energy of 100 keV, and only the total efflux of fast ions changes during the mode, not the pitch angle or energy of the lost ions. Reductions in neutron source strength indicate that (approximately)10 percent of the beam ions can be lost in a single burst, with a cumulative loss of as much as 50 percent. Other MHD activity can cause large losses of beam ions, including passing ions.
Book Synopsis Alfven Frequency Modes at the Edge of TFTR Plasmas by :
Download or read book Alfven Frequency Modes at the Edge of TFTR Plasmas written by and published by . This book was released on 1995 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: An Alfven frequency mode (AFM) is very often seen in TFTR neutral beam heated plasmas as well as ohmic plasmas. This quasi-coherent mode is so far only seen on the magnetic fluctuation diagnostics (Mirnov coils). A close correlation between the plasma edge density and the mode activity (frequency and amplitude) has been observed, which indicates that the AFM is an edge localized mode with r/a> 0.85. No direct impact of this mode on the plasma global performance or fast ion loss (e.g., the [alpha]-particles in DT experiments) has been observed. This mode is apparently not the conventional TAE (toroidicity-induced Alfven eigenmodes). The present TAE theory cannot explain the observation. Other possible explanations are discussed.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1993 with total page 922 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Alpha-driven TAE Modes at Lowered Ion Temperature in TFTR DT Discharges by : S. J. Zweben
Download or read book Search for Alpha-driven TAE Modes at Lowered Ion Temperature in TFTR DT Discharges written by S. J. Zweben and published by . This book was released on 1995 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Improved Analysis of Measured MHD Activity and the Use of Toroidicity Induced Alfvén Eigenmodes to Constrain Current Density Profile Reconstruction in the ASDEX Upgrade Tokamak by : Karl D. Sassenberg
Download or read book Improved Analysis of Measured MHD Activity and the Use of Toroidicity Induced Alfvén Eigenmodes to Constrain Current Density Profile Reconstruction in the ASDEX Upgrade Tokamak written by Karl D. Sassenberg and published by . This book was released on 2009 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a tokamak plasma, knowledge of the thermal particle and supra-thermal ion populations, and their dynamics is essential for controlled operation as the plasma pressure and current gradients provide the energy required to trigger various types of (MagnetoHydroDynamic) MHD instabilities that act to degrade plasma control and performance. Therefore studying the behaviour of MHD instabilities will reveal considerable information about the various particle populations in the plasma. In particular, a sensitive and readily excitable class of MHD instability in a tokamak plasma is the Toroidicity induced Alfvén Eigenmode (TAE). This mode is excited by supra-thermal ions and its frequency depends on the magnetic field strength, mass density profile, safety factor and the major radius of a tokamak, making it a rich source of information. At ASDEX Upgrade plasma ions are accelerated to energies of 1MeV and higher by Ion Cyclotron Resonance Heating. The interactions between TAEs and the resulting supra-thermal ion population is used to infer the effects that TAEs will have on fusion-born {uF061}-particles in a thermonuclear fusion reactor. This is of paramount importance to ITER and any future fusion devices, as {uF061}-particles are envisioned to be the main source of energy used to maintain a burning plasma. The aim of this research was to characterise typically observed fast ion excited TAEs at ASDEX Upgrade, to study the stability of fast ion excited TAEs at ASDEX Upgrade, to demonstrate that such TAEs could be driven by ICRF (Ion Cyclotron Radio Frequency) beat waves, and to improve equilibrium reconstructions using TAE derived safety factor information. To this end all milestones were achieved demonstrating that the techniques developed to drive TAEs with ICRF beat waves provides the basis for a new diagnostic, which complements existing safety factor profile diagnostics.
