Plasma heating r and d assessment

Jassby, D. L.; Berkner, K.H.; Colestock, P. L.; Freeman, R. L.; Haselton, H.H.; Hosea, J.; Rome, J.A.; Scharer, J.E.; Sheffield, John; Stewart, L.D.

doi:10.2172/5751893

Cited by 2 publications

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“…It is now posoible to envision neutral-beam-driven, steady-state reactors with acceptable levels of recirculated power. This result relies on the development of efficient, high-energy (> 1 MeV) neutral deuterium beams which would have much higher current-drive efficiency than the 200 keV D° beams used in previous studies [10,11] . More specifically, we find that steady-state reactors could be economically competitive with pulsed-ignition reactors If cyclic-loading problems force the toroidal magnetic-field strength of pulsed reactors to be ~ 15% lower than that of steady-state reactors (see Fig.…”

Section: Discussionmentioning

confidence: 99%

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Optimization of steady-state beam-driven tokamak reactors

Mikkelsen

Singer

1982

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VXSftUBD IDK 981 0.8. OBRMtBMCMT OF MHCT,. wro** annum u«-AC02-76-ca&-3073. .. ; >CTni(lllTinN Of THIS OOCHMEHT IS IMIPCT MOTICg This report was prepared as an .ABSTRACT Recent developments in neutral beam technology prompt us to reconsider the prospects for steady-state tokamak reactors. A mathematical reactor model is developed which includes the physics of beam-driven currents and reactor power balance, as well as reactor and beam system costs. This model is used to find the plasma temperatures which minimize the reactor cost per unit of net electrical output. The optimum plasma temperatures are nearly independent of P and are roughly twice as high as the optimum temperatures for ignited reactors. If beams of neutral deuterium atoms with near-optimum energies of 1-2 MeV are used to drive the current in an INTOR-sized reactor, then the optimum temperatures are typically T e = 12-15 keV and T t = 17-21 keV for a wide range of model parameters. Net electrical output rises rapidly with increasing deuterium beam energy for E^ < 400 keV, but rises only slowly above E^ ~ 1 MeV. tfe estimate that beam-driven steady-state reactors could be economically competitive with pulsed-lgnition reactors if cyclic-loading problems limit the toroidal magnetic field strength of pulsed reactorsto < 85% of that allowed in steady-state reactors.nvnuiilv two' 'e'-Bti mow a' th

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Section: Discussionmentioning

confidence: 99%

“…In unpublished studies, Jassby [10], Rutherford [11], and one of the authors [C. E. Singer] concluded that current-driven reactors based on ~ 200 keV D° would have a Q = P fusion/ ? beam of only ~ 3.…”

Section: Introductionmentioning

confidence: 99%

Optimization of steady-state beam-driven tokamak reactors

Mikkelsen

Singer

1982

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“…These pump powers too are higher than presentday experimental values. However, in future experiments, where it is proposed to use klystron tubes of 1 MW or more (Jassby et al 1979), the decay of the lower-hybrid wave into an ion cyclotron quasi-mode and a whistler wave may be a possible source of power loss.…”

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confidence: 99%

Decay of the lower-hybrid wave into an ion cyclotron mode and a whistler wave

Saxena

1982

J. Plasma Phys.

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The electrostatic lower-hybrid wave is shown to decay parametrically into a whistler wave and a resonant ion cyclotron mode or an ion cyclotron quasi-mode or a reactive quasi-mode. The convective threshold powers for these decay instabilities are found to be much larger than presently available pump powers. These decay instabilities, however, are expected to play an important role in the saturation of the parametrically excited short-wavelength lower-hybrid waves having frequency close to ωlh.

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Plasma heating r and d assessment

Cited by 2 publications

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Optimization of steady-state beam-driven tokamak reactors

Optimization of steady-state beam-driven tokamak reactors

Decay of the lower-hybrid wave into an ion cyclotron mode and a whistler wave

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