Author: Masanori MurakamiPublisher:
ISBN:
Category : Heating
Languages : en
Pages : 11
Book Description
Confinement Studies of Neutral Beam Heated Discharges in TFTR.
Author: Masanori MurakamiPublisher:
ISBN:
Category : Heating
Languages : en
Pages : 11
Book Description
Confinement Studies of Neutral Beam Heated Discharges in TFTR.
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The TFTR tokamak has reached its original machine design specifications (I/sub p/ = 2.5 MA and B/sub T/ = 5.2T). Recently, the D° neutral beam heating power has been increased to 6.3 MW. By operating at low plasma current (I/sub p/ approx. = 0.8 MA) and low density anti n/sub e/ approx. = 1 x 1019m−3), high ion temperatures (9 +- keV) and rotation speeds (7 x 105 m/s) have been achieved during injection. At the opposite extreme, pellet injection into high current plasmas has been used to increase the line-average density to 8 x 1019m−3 and the central density to 1.6 x 102°m−3/ This wide range of operating conditions has enabled us to conduct scaling studies of the global energy confinement time in both ohmically and beam heated discharges as well as more detailed transport studies of the profile dependence. In ohmic discharges, the energy confinement time is observed to scale linearly with density only up to anti n/sub e/ approx. 4.5 x 1019m−3 and then to increase more gradually, achieving a maximum value of approx. 0.45 s. In beam heated discharges, the energy confinement time is observed to decrease with beam power and to increase with plasma current. With P/sub b/ = 5.6 MW, anti n/sub e/ = 4.7 x 1019m−3, I/sub p/ = 2.2 MA and B/sub T = 4.7T, the gross energy confinement time is 0.22 s and T/sub i/(0) = 4.8 keV. Despite shallow penetration of D° beams (at the beam energy less than or equal to 80 keV with low species yield), tau/sub E/(a) values are as large as those for H° injection, but central confinement times are substantially greater. This is a consequence of the insensitivity of the temperature and safety factor profile shapes to the heating profile. The radial variation of tau/sub E/ is even more pronounced with D° injection into high density pellet-injected plasmas. 25 refs.
Energy Research Abstracts
Author: Experimental Results from the TFTR Tokamak
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Recent experiments on TFTR have extended the operating regime of TFTR in both ohmic- and neutral-beam-heated discharges. The TFTR tokamak has reached its original machine design specifications (I/sub p/ = 2.5 MA and B/sub T/ = 5.2 T). Initial neutral-beam-heating experiments used up to 6.3 MW of deuterium beams. With the recent installation of two additional beamlines, the power has been increased up to 11 MW. A deuterium pellet injector was used to increase the central density to 2.5 x 102° m−3 in high current discharges. At the opposite extreme, by operating at low plasma current (I/sub p/ approx. 0.8 MA) and low density (anti n/sub e/ approx. 1 x 1019 m−3), high ion temperatures (9 +- 2 keV) and rotation speeds (7 x 105 m/s) have been achieved during injection. In addition, plasma compression experiments have demonstrated acceleration of beam ions from 82 keV to 150 keV, in accord with expectations. The wide operating range of TFTR, together with an extensive set of diagnostics and a flexible control system, has facilitated transport and scaling studies of both ohmic- and neutral-beam-heated discharges. The results of these confinement studies are presented.
Fusion Energy Update
Author: Energy Research Abstracts
Author: Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 900
Book Description
Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Fusion Technology
Author: Philosophical Transactions of the Royal Society of London
Author: Biographical Memoirs
Author: National Academy of SciencesPublisher: National Academies Press
ISBN: 030908699X
Category : Biography & Autobiography
Languages : en
Pages : 387
Book Description
Biographic Memoirs Volume 83 contains the biographies of deceased members of the National Academy of Sciences and bibliographies of their published works. Each biographical essay was written by a member of the Academy familiar with the professional career of the deceased. For historical and bibliographical purposes, these volumes are worth returning to time and again.
Tokamak Fusion Reactor Design Using Recent Theoretical Models of Heat Transport
Author: Erfan IbrahimPublisher:
ISBN:
Category : Plasma diffusion
Languages : en
Pages : 132
Book Description