High-Q plasmas in the TFTR tokamak
Description
In the Tokamak Fusion Test Reactor, the highest neutron source strength S{sub n} and D-D fusion power gain Q{sub DD} are realized in the neutral-beam fueled and heated supershot'' regime that occurs after extensive wall conditioning to minimize recycling. For the best supershots, S{sub n} increases approximately as P{sub b}{sup 1.8}. The highest-Q shots are characterized by high T{sub e}, T{sub i}, and stored energy highly peaked density profiles, broad T{sub e} profiles, and lower Z{sub eff}. Replacement of critical areas of the graphite limiter tiles with carbon-fiber composite tiles, and improved alignment with the plasma, have mitigated the carbon … continued below
Physical Description
29 pages
Creation Information
Jassby, D. L.; Bell, M. G.; Bitter, M.; Boivin, R.; Bretz, N. L.; Budny, R. V. et al. May 1, 1991.
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Authors
- Jassby, D. L.
- Bell, M. G.
- Bitter, M.
- Boivin, R.
- Bretz, N. L.
- Budny, R. V.
- Dylla, H. F.
- Efthimion, P. C.
- Fredrickson, E. D.
- Hawryluk, R. J.
- Hill, K. W.
- Hosea, J.
- Hsuan, H.
- Janos, A. C.
- Jobes, F. C.
- Johnson, D. W.
- Johnson, L. C.
- Kamperschroer, J.
- Kieras-Phillips, C.
- Kilpatrick, S. J.
- LaMarche, P. H.
- LeBlanc, B.
- Mansfield, D. K.
- McCune, D. C.
- McGuire, K. M.
- Meade, D. M.
- Medley, S. S.
- Mikkelsen, D. R.
- Mueller, D.
- Owens, D
Sponsor
- United States. Department of Energy. DOE; USDOE, Washington, DC (United States)
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Princeton University. Plasma Physics Laboratory.
Publisher Info: Princeton Univ., NJ (USA). Plasma Physics Lab.Place of Publication: New Jersey
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Description
In the Tokamak Fusion Test Reactor, the highest neutron source strength S{sub n} and D-D fusion power gain Q{sub DD} are realized in the neutral-beam fueled and heated supershot'' regime that occurs after extensive wall conditioning to minimize recycling. For the best supershots, S{sub n} increases approximately as P{sub b}{sup 1.8}. The highest-Q shots are characterized by high T{sub e}, T{sub i}, and stored energy highly peaked density profiles, broad T{sub e} profiles, and lower Z{sub eff}. Replacement of critical areas of the graphite limiter tiles with carbon-fiber composite tiles, and improved alignment with the plasma, have mitigated the carbon bloom.'' Wall conditioning by lithium pellet injection prior to the beam pulse reduces carbon influx and particle recycling. Empirically, Q{sub DD} increases with decreasing pre-injection carbon radiation, and increases strongly with density peakedness during the beam pulse. To date the best fusion results are S{sub n} = 5 {times} 10{sup 16} n/s, Q{sub DD} = 1.85 {times} 10{sup {minus}3}, and neutron yield = 4.0 {times} 10{sup 16} n/pulse, obtained at I{sub p} = 1.6 to 1.9 MA and beam energy E{sub b} = 95 to 103 keV, with nearly balanced co- and counter-injected beam power. Computer simulations of supershot plasmas show that typically 50--60% of S{sub n} arises from beam-target reactions, with the remainder divided between beam-beam and thermonuclear reactions, the thermonuclear fraction increasing with P{sub b}. The simulations predict that Q{sub DT} = 0.3 to 0.4 would be obtained for the best present plasma conditions, if half the deuterium neutral beams were to be replaced by tritium beams. Somewhat higher values are calculated if D beams are injected into a predominantly tritium target plasma. The projected central beta of fusion alphas is 0.4--0.6%, a level sufficient for the study of alpha-induced collective effects. 16 refs., 8 figs., 3 tabs.
Physical Description
29 pages
Notes
OSTI; NTIS; INIS; GPO Dep.
Subjects
Keywords
- Carbon
- Computerized Simulation
- Confinement
- Elemental Minerals
- Elements
- Emission
- First Wall
- Graphite
- Limiters
- Measuring Instruments
- Minerals
- Neutron Detectors
- Neutron Emission
- Nonmetals
- Pellet Injection
- Performance
- Plasma Confinement
- Radiation Detectors
- Simulation
- Tftr Tokamak
- Thermonuclear Reactor Walls
- Thermonuclear Reactors
- Tokamak Type Reactors 700101* -- Fusion Energy-- Plasma Research-- Confinement, Heating, & Production
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Source
- 32. annual meeting of the American Physical Society - Division of Plasma Physics (APS/DPP), Cincinnati, OH (USA), 12-16 Nov 1990
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- Other: DE91012312
- Report No.: PPPL-2756
- Report No.: CONF-9011127--19
- Grant Number: AC02-76CH03073
- Office of Scientific & Technical Information Report Number: 5830939
- Archival Resource Key: ark:/67531/metadc1100875
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- May 1, 1991
Added to The UNT Digital Library
- Feb. 18, 2018, 3:59 p.m.
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- Sept. 9, 2020, 1:15 p.m.
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Jassby, D. L.; Bell, M. G.; Bitter, M.; Boivin, R.; Bretz, N. L.; Budny, R. V. et al. High-Q plasmas in the TFTR tokamak, article, May 1, 1991; New Jersey. (https://digital.library.unt.edu/ark:/67531/metadc1100875/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.