Overview of DT results from TFTR

Bell, M.G.; McGuire, K.; Arunasalam, V.; Barnes, Cris W.; Batha, S. H.; Bateman, G.; Beer, M; Bell, R. E.; Bitter, M.; Bretz, N.; Budny, R.; Bush, C. E.; Cauffman, Steve; Chang, Z.; Chang, Choong-Seock; Cheng, C. Z.; Darrow, D.S.; Dendy, R. O.; Dorland, W.; Duong, H. H.; Durst, R.; Efthimion, P. C.; Ernst, D. R.; Evenson, H.; Fisch, Nathaniel J.; Fisher, R. K.; Fonck, R.J.; Fredrickson, E. D.; Fu, G. Y.; Furth, H. P.; Grek, B.; Grisham, L.; Hammett, G. W.; Hanson, G. R.; Hawryluk, R. J.; Heidbrink, W. W.; Herrmann, H. W.; Hill, K. W.; Hosea, J. C.; Hsuan, H.; Hughes, M.H.; Hülse, R.; Janos, A.; Jassby, D.L.; Jobes, F. C.; Johnson, D. W.; Johnson, L. C.; Kesner, J.; Kugel, H.; Lâm, Nguyễn Thanh; LeBlanc, B.; Levinton, F. M.; Machuzak, J. S.; Majeski, R.; Mansfield, D. K.; Mazzucato, E.; Mauel, M. E.; McChesney, J. M.; McCune, D.; McKee, G. W.; Meade, D. M.; Medley, S. S.; Mikkelsen, D. R.; Mirnov, S.V.; Mueller, D.; Navratil, G.A.; Nazikian, R.; Owens, D. K.; Park, H.K.; Park, W.; Parks, P.B.; Paul, S. F.; Петров, М. П.; Phillips, C. K.; Phillips, Michael W.; Pitcher, C. S.; Ramsey, A. T.; Redi, M. H.; Rewoldt, G.; Roberts, D.; Rogers, J. H.; Ruskov, E.; Sabbagh, S. A.; Sasao, M.; Schilling, G.; Schivell, J.; Schmidt, G. L.; Scott, Steve; Semenov, I.; Šesnić, S.; Skinner, C.H.; Stratton, B. C.; Strachan, J.D.; Stodiek, W.; Synakowski, E. J.; Takahashi, H.; Tang, W. M.; Taylor, G.; Terry, J. L.; Thompson, Mark E.; Tighe, W.; Goeler, S. von; White, R. B.; Wieland, R.; Wilson, J. R.; Wong, K. L.; Woskov, P.; Wurden, G. A.; Yamada, Masaaki; Young, K. M.; Zarnstorff, M. C.; Zweben, S. J.

doi:10.1088/0029-5515/35/12/i02

Cited by 46 publications

(17 citation statements)

References 23 publications

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“…To date, no 'anomalous' alpha particle losses due to alpha-driven collective instabilities have be observed in TFTR NBI-heated D-T discharges without ICRH [24,27]. This fact supports the expectation of classical ion behavior for the PCX alpha and triton measurements reported in this paper.…”

Section: Discussionsupporting

confidence: 88%

Measurements of confined alphas and tritons in the MHD quiescent core of TFTR plasmas using the pellet charge exchange diagnostic

Medley

Budny

Mansfield

et al. 1996

Plasma Phys. Control. Fusion

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The energy distributions and radial density profiles of the fast confined trapped alpha particles in DT experiments on TFTR are being measured in the energy range 0.5-3.5 MeV using the pellet charge exchange (PCX) diagnostic. A brief description of the measurement technique which involves active neutral particle analysis using the ablation cloud surrounding an injected impurity pellet as the neutralizer is presented. This paper focuses on alpha and triton measurements in the core of MHD quiescent TFTR discharges where the expected classical slowing-down and pitch angle scattering effects are not complicated by stochastic ripple diffusion and sawtooth activity. In particular, the first measurement of the alpha slowing-down distribution up to the birth energy, obtained using boron pellet injection, is presented. The measurements are compared with predictions using either the TRANSP Monte Carlo code and/or a Fokker-Planck Post-TRANSP processor code, which assumes that the alphas and tritons are well confined and slow down classically. Both the shape of the measured alpha and triton energy distributions and their density ratios are in good agreement with the code calculations. We can conclude that the PCX measurements are consistent with classical thermalization of the fusion-generated alphas and tritons.

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Section: Discussionsupporting

confidence: 88%

Measurements of confined alphas and tritons in the MHD quiescent core of TFTR plasmas using the pellet charge exchange diagnostic

Medley

Budny

Mansfield

et al. 1996

Plasma Phys. Control. Fusion

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“…For discharges in which the reactivity is enhanced due to non-thermal reactions, the ratio of PDT/PDD also decreases for Ti above 15 keV. Experimentally in high performance supershots on TFTR, the ratio of PDT/PDD is -115 if plasmas with the same stored energy are compared (Bell et al, 1994;McGuire et al, 1996;Bell et al, 1996). This ratio is especially relevant if the stored energy is constrained by P-limiting disruptions.…”

Section: Fusion Power Productionmentioning

confidence: 99%

“…Another practical consideration is that the ratio of n d n T is determined not only by the ratios of the beam fueling rate, P dp b, but also by the recycling and influx of hydrogenic species from T D plasma facing components (Bell et al, 1994). A striking result of the TFTR experiments was the low level of tritium recycling at the limiters.…”

Section: Page 34mentioning

confidence: 99%

Results from deuterium-tritium tokamak confinement experiments

Hawryluk

1998

Rev. Mod. Phys.

122

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Recent scientific and technical progress in magnetic fusion experiments has resulted in the achievement of plasma parameters (density and temperature) which enabled the production of significant bursts of fusion power from deuterium-tritium fuels and the first studies of the physics of burning plasmas. The key scientific issues in the reacting plasma core are plasma confinement, magnetohydrodynamic (MHD) stability, and the confinement and loss of energetic fusion products from the reacting fuel ions. Progress in the development of regimes of operation which have both good confinement and are MHD stable have enabled a broad study of burning plasma physics issues.

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“…Some of the early tokamaks used this configuration, including the Tokamak Fusion Test Reactor (TFTR), which was an experimental tokamak built at Princeton Plasma Physics Laboratory (in Princeton, New Jersey) around 1980 and produced 10.7 MW of nuclear fusion power in 1995 [10]. The disadvantage of the limiter configuration is that the interaction with the vessel wall occurs near to the core of the plasma.…”

Section: Magnetic Confinement In Tokamaksmentioning

confidence: 99%

Nuclear fusion: bringing a star down to Earth

Kirk

2015

Contemporary Physics

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Nuclear fusion offers the potential for being a near limitless energy source by fusing together deuterium and tritium nuclei to form helium inside a plasma burning at 100 million kelvin. However, scientific and engineering challenges remain. This paper describes how such a plasma can be confined on Earth and discusses the similarities and differences with fusion in stars. It focusses on the magnetic confinement technique and, in particular, the method used in a tokamak. The confinement achieved in the equilibrium state is reviewed and it is shown how the confinement can be too good, leading to explosive instabilities at the plasma edge called Edge Localised modes (ELMs). It is shown how the impact of ELMs can be minimised by the application of magnetic perturbations and discusses the physics behind the penetration of these perturbations into what is ideally a perfect conducting plasma.

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Overview of DT results from TFTR

Cited by 46 publications

References 23 publications

Measurements of confined alphas and tritons in the MHD quiescent core of TFTR plasmas using the pellet charge exchange diagnostic

Measurements of confined alphas and tritons in the MHD quiescent core of TFTR plasmas using the pellet charge exchange diagnostic

Results from deuterium-tritium tokamak confinement experiments

Nuclear fusion: bringing a star down to Earth

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