The Effect of Plasma Profiles on the Critical Value of $$n\uptau_{E}$$ n τ E for Ignition

Khosrowpour, Behzad; Nassiri-Mofakham, Nora

doi:10.1007/s10894-016-0084-z

Cited by 8 publications

(3 citation statements)

References 11 publications

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“…Our analysis of the physics of burning-plasmas in 0D is analogous to the one carried out in [11] for ignition and similar in spirit to the work done by other authors, see e.g. [22][23][24][25]. The starting point is the traditional 0D single-fluid Lawson energy balance:…”

Section: Multi-fluid Burning-plasma Physics In 0dmentioning

confidence: 83%

Two-fluid burning-plasma analysis for magnetic confinement fusion devices

Guazzotto

Betti

2019

Plasma Phys. Control. Fusion

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The two-fluid, Lawson-type ignition model of (Guazzotto and Betti 2017 Phys. Plasmas 24 082504) for nuclear fusion concepts is extended to burning-plasmas. Numerical estimates for the Lawson product t p Ei tot are obtained for different values of the gain factor Q and different plasma conditions. Namely, different assumptions are made for the various energy confinement times in the model and different density and temperature profiles are considered. It is found that it is easier to reach the burning plasma condition with peaked profiles. A technique for comparing pure-deuterium (DD) 'equivalent' experimental discharges with the predictions of our model for deuterium-tritium (DT) burning plasma discharges is described. This is done through the introduction of 'no−α' quantities using a procedure similar to the one used in inertial confinement fusion. Using tokamaks as a meaningful example, an experimental fit for the energy confinement time is introduced in the calculations and shown to have a considerable effect on the results, qualitatively changing the thermal stability of the system and the equivalent Lawson product estimates of pure deuterium plasmas. Moreover, if the energy confinement time depends on the heating power as in experimental scalings, the equivalent t p Ei tot in DD discharges is higher than the corresponding t p Ei tot in a DT plasma.

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Section: Multi-fluid Burning-plasma Physics In 0dmentioning

confidence: 83%

Two-fluid burning-plasma analysis for magnetic confinement fusion devices

Guazzotto

Betti

2019

Plasma Phys. Control. Fusion

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“…In the limit S n → 0 and S T → 0, the peak is infinitely broad and we recover the uniform-profile case. This approach accommodates a wide range of profiles [95,96]. From Eqs.…”

Section: Effect Of Spatial Profilesmentioning

confidence: 99%

Progress toward fusion energy breakeven and gain as measured against the Lawson criterion

Wurzel,

Hsu

2021

Preprint

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The Lawson criterion is a key concept in the pursuit of fusion energy, relating the fuel density n, (energy) confinement time τ , and fuel temperature T to the energy gain Q of a fusion plasma. The purpose of this paper is to explain and review the Lawson criterion and to provide a compilation of achieved parameters for a broad range of historical and contemporary fusion experiments. Although this paper focuses on the Lawson criterion, it is only one of many equally important factors in assessing the progress and ultimate likelihood of any fusion concept becoming a commercially viable fusion energy system. Only experimentally measured or inferred values of n, τ , and T that have been published in the peer-reviewed literature are included in this paper. For extracting these parameters, we discuss methodologies that are necessarily specific to different fusion approaches (including magnetic, inertial, and magneto-inertial fusion). This paper is intended to serve as a reference for fusion researchers and a tutorial for all others interested in fusion energy.

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“…Actually, this is not the case. The use of steeper plasma profiles of temperature and density leads to time increasing of the energy confinement in the plasma [12][13][14][15][16][17][18][19][20], to the Lawson criterion decreasing [19], and decreasing of the ignition and combustion temperatures [20]. For example, in [18] it is experimentally shown that with density peaking increasing by 3 times in comparison with " flat" distribution in L-mode the "…”

Section: Introductionmentioning

confidence: 99%

Effect of plasma parameter profiles on a thermonuclear reaction operation

Yu.V.

E.I.

2022

Technical Physics

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The operation of a thermonuclear reactor on an alternative to D-T fuel (D-D, Cat-DD, D-3He, p-11B, p-6Li) requires a higher temperature of the fuel mixture and an increased plasma energy confinement time. It is shown that at a fixed power of thermonuclear reaction, an increase in the peaking of plasma parameters leads to a decrease in power, which is necessary to its addition heating. Moreover, the peaking of the plasma parameters leads to decrease of its radiation losses. All this reduces the requirements for the operating conditions of thermonuclear reactor. Keywords: thermonuclear reactor, alternative fuel, picking.

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The Effect of Plasma Profiles on the Critical Value of $$n\uptau_{E}$$ n τ E for Ignition

Cited by 8 publications

References 11 publications

Two-fluid burning-plasma analysis for magnetic confinement fusion devices

Two-fluid burning-plasma analysis for magnetic confinement fusion devices

Progress toward fusion energy breakeven and gain as measured against the Lawson criterion

Effect of plasma parameter profiles on a thermonuclear reaction operation

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