Comment on an intranuclear-cascade model

Fredrickson, R. A.

doi:10.1103/physrevd.15.3466

Cited by 4 publications

(6 citation statements)

References 7 publications

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“…Fast-ion losses are modeled in three steps. 28 First, the equilibrium properties and the linear magnetohydrodynamics stability are calculated for the time at which the avalanche occurs through the TRANSP and NOVA-K codes. 29,30 Second, a selection is performed among all the possible unstable eigenmodes found by NOVA-K by comparing the mode structure measured by the multichannel reflectometer system with a synthetic output calculated from the simulation.…”

Section: Modeling Of Fast-ion Losses By Tae Avalanchesmentioning

confidence: 99%

“…From previous analyses, a successful identification of the eigenmodes has been obtained for avalanches accompanied by fast-ion losses of 15%. 28 This may be explained by assuming that most of the losses during an avalanche are caused by nonlinear pro-cesses, and therefore the amount of losses is somewhat indicative of the degree of nonlinearity. In that case, a 40% loss in fast-ion population would imply that nonlinearities are too strong to be convincingly recovered through linear analysis.…”

Section: Modeling Of Fast-ion Losses By Tae Avalanchesmentioning

confidence: 99%

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Experimental studies on fast-ion transport by Alfvén wave avalanches on the National Spherical Torus Experiment

et al. 2009

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Fast-ion transport induced by Alfvén eigenmodes ͑AEs͒ is studied in beam-heated plasmas on the National Spherical Torus Experiment ͓Ono et al., Nucl. Fusion 40, 557 ͑2000͔͒ through space, time, and energy resolved measurements of the fast-ion population. Fast-ion losses associated with multiple toroidicity-induced AEs ͑TAEs͒, which interact nonlinearly and terminate in avalanches, are characterized. A depletion of the energy range Ͼ20 keV, leading to sudden drops of up to 40% in the neutron rate over 1 ms, is observed over a broad spatial range. It is shown that avalanches lead to a relaxation of the fast-ion profile, which in turn reduces the drive for the instabilities. The measured radial eigenmode structure and frequency of TAEs are compared with the predictions from a linear magnetohydrodynamics stability code. The partial disagreement suggests that nonlinearities may compromise a direct comparison between experiment and linear theory.

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Section: Modeling Of Fast-ion Losses By Tae Avalanchesmentioning

confidence: 99%

Section: Modeling Of Fast-ion Losses By Tae Avalanchesmentioning

confidence: 99%

Experimental studies on fast-ion transport by Alfvén wave avalanches on the National Spherical Torus Experiment

et al. 2009

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“…The inferred island size is found to be = 1 5 em. Flattened regions of this order have been identified on the Te(r) and the ne (r) profiles measured by the Thomson scattering system (Fredrickson, 1988).…”

Section: O B a Lmentioning

confidence: 99%

“…A cylindrical The measured total pressure profile Ptgt(r),during the best TFTR supershots lies very close to the high-n ideal ballooning limit profile inferred from the calculated q profile. delta-prime code (Fredrickson, 1988) and the PEST-3 code (Grimm, 1982) have also been used to study the resistive MHD mode stability of TFI'R supershots close t o the pp = 2 disruption limit as well as other discharges that have coherent MHD activity. The results show that many of the discharges are close to marginal stability for the m/n = 2/1 mode but that the m/n = 3/2 is stable in all cases studied.…”

Section: O B a Lmentioning

confidence: 99%

Transport and stability studies on TFTR

McGuire

Arunsalam

Barnes

et al. 1988

Plasma Phys. Control. Fusion

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During the 19G7 run, TFTR reached record values of Qrjrj, neutron source strength, and T;(0). Good confinement together with intense auxiliary heating has resulted in a plasma pressure greater than 3 x 10* Pascals on axis, which is at the ballooning stability boundary. At the same time improved diagnostics, especially ion temperature profile measurements, have led to increased understanding of tokamak confinement physics. Ion temperature profiles are found to be much more peaked than previously thought, implying that ion thermal diffusivity, even in high ion temperature supershot plasmas, is greater than electron thermal diffusivity. Based on studies of the effect of beam orientation on plasma performance, one of the four neutral beamlines has been re-oriented from injecting co-parallel to counter parallel, which will increase the available balanced neutral injection power from 14 MW to 27 MW. With this increase in balanced beam power, and the addition of 7 MW of 1CRF power it is planned to increase the present equivalent QDT of 0.25 to close to break-even conditions in the coming run.

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“…Finally, the connection between the photodamaging effects of UV-radiation on skin and its ultimate cause of skin cancer appears also established (Ref. 44). Consequently, we investigated the interaction of the 1,2-dioxetane (ld) with several cell lines, to explore the efficiency of such hyperenergetic substances in promoting cell mutations.…”

Section: I'jleementioning

confidence: 99%

Thermal generation of electronic excitation with hyperenergetic molecules

Adam¹

1980

Pure and Applied Chemistry

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Abstract-The synthesis of a large variety of hyperenergetic molecules such as the 1,2-dioxetanes, u-peroxylactones, 3-imino-l, 2-dioxetanes, benzo-l,4-dioxin dioxetanes, bisdioxetanes, u-pyrone endoperoxides and cyclic peroxalates are presented. The utilization of these unique substances for the thermal generation of electronically excited states is reviewed, with special reference to the total excitation yield ($T+S) and spin state selectivities ($T/$S), The physical and chemical methods for the determination of excitation yields are discussed and scrutinized for their reliability and effectiveness, Mechanistic problems such as energy transfer, heavy atom effects, electron exchange, etc. are analyzed. The biological implications of such "high energy" molecules is emphasized.

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Comment on an intranuclear-cascade model

Cited by 4 publications

References 7 publications

Experimental studies on fast-ion transport by Alfvén wave avalanches on the National Spherical Torus Experiment

Experimental studies on fast-ion transport by Alfvén wave avalanches on the National Spherical Torus Experiment

Transport and stability studies on TFTR

Thermal generation of electronic excitation with hyperenergetic molecules

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