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Author : M. G. Bell
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (713 download)
Download or read book Experiments with High-reactivity Deuterium-tritium Plasmas in TFTR. written by M. G. Bell and published by . This book was released on 1995 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : K. M. McGuire
Publisher :
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4.:/5 (713 download)
Download or read book Physics of High Performance Deuterium-tritium Plasmas in TFTR. written by K. M. McGuire and published by . This book was released on 1996 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 15 pages
Book Rating : 4.:/5 (871 download)
Download or read book High Performance Deuterium-tritium Plasmas in TFTR. written by and published by . This book was released on 1995 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasmas composed of nominally equal concentrations of deuterium and tritium (DT) have been created in TFTR with the goals of producing significant levels of fusion power and of examining the effects of DT fusion alpha particles. Conditioning of the limiter by the injection of lithium pellets has led to an approximate doubling of the energy confinement time, [tau]{sub E}, in supershot plasmas at high plasma current (I{sub p} d"2.5 MA) and high heating power (P{sub b} d"33 MW). Operation with DT typically results in an additional 20% increase in [tau]{sub E}. In the high poloidal beta, advanced tokamak regime in TFTR, confinement enhancement H {triple_bond} [tau]{sub E}/[tau]{sub E ITER-89P}> 4 has been obtained in a limiter H-mode configuration at moderate plasma current I{sub p} = 0.85 - 1.5 MA. By peaking the plasma current profile, [beta]{sub N dia} {triple_bond} 108 [beta]{sub t{perpendicular}} aB0/I{sub p} = 3 has been obtained in these plasmas, exceeding the [beta]{sub N} limit for TFTR plasmas with lower internal inductance, l{sub i}. Confinement of alpha particles appears to be classical and losses due to collective effects have not been observed. While small fluctuations in fusion product loss were observed during ELMs, no large loss was detected in DT plasmas.
Author : Lewis Duncan Mason
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (729 download)
Download or read book The Present Status of the Results of the Study of Alcohol in America written by Lewis Duncan Mason and published by . This book was released on 1913 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : S. A. Sabbagh
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (141 download)
Download or read book HIGH PERFORMANCE DEUTERIUM-TRITIUM PLASMAS IN TFTR. written by S. A. Sabbagh and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plasma-surface Interactions in TFTR D-T Experiments written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: TFTR has begun its campaign to study deuterium-tritium fusion under reactor-like conditions. Variable amounts of deuterium and tritium neutral beam power have been used to maximize fusion power, study alpha heating, investigate alpha particle confinement, and search for alpha driven plasma instabilities. Additional areas of study include energy and particle transport and confinement, ICRF heating schemes for DT plasmas, tritium retention, and fusion in high[beta][sub p] plasmas. The majority of this work is done in the TFTR supershot confinement regime. To obtain supershots, extensive limiter conditioning using helium fueled ohmic discharges and lithium pellet injection into ohmic and neutral beam heated plasmas is performed, resulting in a low recycling limiter. The relationship between recycling and core plasma confinement has been studied by using helium, deuterium and high-Z gas puffs to simulate high recycling limiter conditions. These studies show that confinement in TFTR supershots is very sensitive to the influx of neutral particles at the plasma edge.
Author : K. M. McGuire
Publisher :
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4.:/5 (713 download)
Download or read book Physics of High Performance Deuterium-tritium Plasmas in TFTR. written by K. M. McGuire and published by . This book was released on 1996 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.:/5 (873 download)
Download or read book Preparations for Deuterium Tritium Experiments on the Tokamak Fusion Test Reactor written by and published by . This book was released on 1994 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The final hardware modifications for tritium operation have been completed for the Tokamak Fusion Test Reactor (TFTR). These activities include preparation of the tritium gas handling system, installation of additional neutron shielding, conversion of the toroidal field coil cooling system from water to a Fluorinet{sup {trademark}} system, modification of the vacuum system to handle tritium, preparation and testing of the neutral beam system for tritium operation and a final deuterium-deuterium (D-D) run to simulate expected deuterium-tritium (D-T) operation. Testing of the tritium system with low concentration tritium has successfully begun. Simulation of trace and high power D-T experiments using D-D have been performed. The physics objectives of D-T operation are production of ∼ 10 megawatts (MW) of fusion power, evaluation of confinement and heating in deuterium-tritium plasmas, evaluation of ?-particle heating of electrons, and collective effects driven by alpha particles and testing of diagnostics for confined ?-particles. Experimental results and theoretical modeling in support of the D-T experiments are reviewed.
Author :
Publisher :
ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (685 download)
Download or read book ICRF Heating and Transport of Deuterium-tritium Plasmas in TFTR. written by and published by . This book was released on 1995 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes results of the first experiments utilizing high-power ion cyclotron range of frequency (ICRF) to heat deuterium-tritium (D-T) plasmas in reactor-relevant regimes on the Tokamak Fusion Test Reactor (TFTR). Results from these experiments have demonstrated efficient core, second harmonic, tritium beating of D-T supershot plasmas with tritium concentrations ranging from 6%-40%. Significant direct ion heating on the order of 60% of the input radio frequency (rf) power has been observed. The measured deposition profiles are in good agreement with two-dimensional modeling code predictions. Energy confinement in an rf-heated supershot is at least similar to that without rf, and possibly better in the electron channel. Efficient electron heating via mode conversion of fast waves to ion Bernstein waves (IBW) has been demonstrated in ohmic, deuterium-deuterium and DT-neutral beam injection plasmas with high concentrations of minority 3He (n{sub 3He}/n{sub e} = 15% - 30%). By changing the 3He concentration or the toroidal field strength, the location of the mode-conversion radius was varied. The power deposition profile measured with rf power modulation indicated that up to 70% of the power can be deposited on electrons at an off-axis position. Preliminary results with up to 4 MW coupled into the plasma by 90-degree phased antennas showed directional propagation of the mode-converted IBW. Analysis of heat wave propagation showed no strong inward thermal pinch in off-axis heating of an ohmically-heated target plasma in TFTR.
Author :
Publisher :
ISBN 13 :
Total Pages : 15 pages
Book Rating : 4.:/5 (871 download)
Download or read book Deuterium-tritium TFTR Plasmas in the High Poloidal Beta Regime written by and published by . This book was released on 1995 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deuterium-tritium plasmas with enhanced energy confinement and stability have been produced in the high poloidal beta, advanced tokamak regime in TFTR. Confinement enhancement H {triple_bond} [tau]{sub E}/[tau]{sub E ITER-89P}> 4 has been obtained in a limiter H-mode configuration at moderate plasma current I{sub p} = 0.85 - 1.46 MA. By peaking the plasma current profile, [beta]{sub N dia} {triple_bond} 108 [beta]{sub t{perpendicular}} aB0/I{sub p} = 3 has been obtained in these plasma, s exceeding the [beta]{sub N} limit for TFTR plasmas with lower internal inductance, l{sub i}. Fusion power exceeding 6.7 MW with a fusion power gain Q{sub DT} = 0.22 has been produced with reduced alpha particle first orbit loss provided by the increased l{sub i}.
Author :
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (684 download)
Download or read book Physics of High Performance Dueterium-Tritium Plasmas in TFTR. written by and published by . This book was released on 1996 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past two years, deuterium-tritium (D-T) plasmas in the Tokamak Fusion Test Reactor (TFTR) have been used to study fusion power production, isotope effects associated with tritium fueling, and alpha-particle physics in several operational regimes. The peak fusion power has been increased to 10.7 MW in the supershot mode through the use of increased plasma current and toroidal magnetic field and extensive lithium wall conditioning. The high-internal-inductance (high -li) regime in TFTR has been extended in plasma current and has achieved 8.7 MW of fusion power. Studies of the effects of tritium on confinement have now been carried out in ohmic, NBI- and ICRF-heated L-mode and reversed-shear plasmas. In general, there is an enhancement in confinement time in D-T plasmas which is most pronounced in supershot and high-li discharges, weaker in L-mode plasmas with NBI and ICRF heating and smaller still in ohmic plasmas. In reversed-shear discharges with sufficient deuterium-NBI heating power, internal transport barriers have been observed to form, leading to enhanced confinement. Large decreases in the ion heat conductivity and particle transport are inferred within the transport barrier. It appears that higher heating power is required to trigger the formation of a transport barrier with D-T NBI and the isotope effect on energy confinement is nearly absent in these enhanced reverse-shear plasmas. Many alpha-particle physics issues have been studied in the various operating regimes including confinement of the alpha particles, their redistribution by sawteeth, and their loss due to MHD instabilities with low toroidal mode numbers. In weak-shear plasmas, alpha-particle destabilization of a toroidal Alfven eigenmode has been observed.
Author :
Publisher :
ISBN 13 :
Total Pages : 15 pages
Book Rating : 4.:/5 (871 download)
Download or read book High Performance Deuterium-tritium Plasmas in TFTR. written by and published by . This book was released on 1995 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasmas composed of nominally equal concentrations of deuterium and tritium (DT) have been created in TFTR with the goals of producing significant levels of fusion power and of examining the effects of DT fusion alpha particles. Conditioning of the limiter by the injection of lithium pellets has led to an approximate doubling of the energy confinement time, [tau]{sub E}, in supershot plasmas at high plasma current (I{sub p} d"2.5 MA) and high heating power (P{sub b} d"33 MW). Operation with DT typically results in an additional 20% increase in [tau]{sub E}. In the high poloidal beta, advanced tokamak regime in TFTR, confinement enhancement H {triple_bond} [tau]{sub E}/[tau]{sub E ITER-89P}> 4 has been obtained in a limiter H-mode configuration at moderate plasma current I{sub p} = 0.85 - 1.5 MA. By peaking the plasma current profile, [beta]{sub N dia} {triple_bond} 108 [beta]{sub t{perpendicular}} aB0/I{sub p} = 3 has been obtained in these plasmas, exceeding the [beta]{sub N} limit for TFTR plasmas with lower internal inductance, l{sub i}. Confinement of alpha particles appears to be classical and losses due to collective effects have not been observed. While small fluctuations in fusion product loss were observed during ELMs, no large loss was detected in DT plasmas.
Author : H. G. Adler
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (713 download)
Download or read book Deuterium and Tritium Experiments on TFTR. written by H. G. Adler and published by . This book was released on 1995 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Deuterium-tritium TFTR Plasmas in the High Poloidal Beta Regime written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Deuterium-tritium plasmas with enhanced energy confinement and stability have been produced in the high poloidal beta, advanced tokamak regime in TFTR. Confinement enhancement H[triple-bond][tau][sub E]/[tau][sub E ITER-89P]> 4 has been obtained in a limiter H-mode configuration at moderate plasma current I[sub p]= 0.85[minus] 1.46 MA. By peaking the plasma current profile, [beta][sub N dia][triple-bond] 10[sup 8][beta][sub t[perpendicular]] aB[sub 0]/I[sub p]= 3 has been obtained in these plasma, s exceeding the[beta][sub N] limit for TFTR plasmas with lower internal inductance, l[sub i]. Fusion power exceeding 6.7 MW with a fusion power gain Q[sub DT]= 0.22 has been produced with reduced alpha particle first orbit loss provided by the increased l[sub i].
Author : Mamoru Fujiwara
Publisher : World Scientific
ISBN 13 : 981454504X
Total Pages : 462 pages
Book Rating : 4.8/5 (145 download)
Download or read book Frontier Of Physics In Fusion-relevent Plasmas, The: Proceedings Of The Asian Science Seminar written by Mamoru Fujiwara and published by World Scientific. This book was released on 1998-03-17 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume discusses the aspects of the physics of fusion-relevant plasmas even the relevant aspects of basic plasma physics. It also includes experimental measurements illustrating a great deal of theoretical analysis. It is intended for graduate students in plasma physics, and is also suitable for fusion researchers.
Author :
Publisher :
ISBN 13 :
Total Pages : 294 pages
Book Rating : 4.0/5 ( download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-10 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Results from D-T Experiments on TFTR and Implications for Achieving an Ignited Plasma written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress in the performance of tokamak devices has enabled not only the production of significant bursts of fusion energy from deuterium-tritium plasmas in the Tokamak Fusion Test Reactor (TFTR) and the Joint European Torus (JET) but, more importantly, the initial study of the physics of burning magnetically confined plasmas. As a result of the worldwide research on tokamaks, the scientific and technical issues for achieving an ignited plasma are better understood and the remaining questions more clearly defined. The principal research topics which have been studied on TFTR are transport, magnetohydrodynamic stability, and energetic particle confinement. The integration of separate solutions to problems in each of these research areas has also been of major interest. Although significant advances, such as the reduction of turbulent transport by means of internal transport barriers, identification of the theoretically predicted bootstrap current, and the study of the confinement of energetic fusion alpha-particles have been made, interesting and important scientific and technical issues remain for achieving a magnetic fusion energy reactor. In this paper, the implications of the TFTR experiments for overcoming these remaining issues will be discussed.
