High confinement dissipative divertor operation on Alcator C-Mod

Goetz, J. A.; LaBombard, B.; Lipschultz, B.; Pitcher, C.S.; Terry, J. L.; Boswell, C.; Gangadhara, S.; Pappas, Dimitri; Weaver, James L.; Welch, B.; Boivin, R. L.; Bonoli, P. T.; Fiore, C. L.; Granetz, R.; Greenwald, M.; Hubbard, A.; Hutchinson, I. H.; Irby, J.; Marmar, E.; Mossessian, D.; Porkoláb, M.; Rice, J. E.; Rowan, W. L.; Schilling, G.; Snipes, J. A.; Takase, Y.; Wolfe, S.; Wukitch, S.

doi:10.1063/1.873447

Cited by 44 publications

(55 citation statements)

References 38 publications

(43 reference statements)

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“…In addition to the recombination processes, the experimental data show that the plasma flux to the targets can also be affected by both the power input to the SOL and impurity radiation. It was shown in Goetz et al (1999) that in H-mode, the reduction of Γ w by a factor ∼5 can be achieved by nitrogen gas puffing with virtually no impact of the recombination effects. An impact of the impurity on the rollover of the plasma flux to the target can also be deduced from the JET experiments with carbon and ITER-like wall (Brezinsek et al 2015).…”

Section: Mechanisms Of Divertor Plasma Detachmentmentioning

confidence: 99%

Physics of ultimate detachment of a tokamak divertor plasma

Krasheninnikov¹,

2017

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The basic physics of the processes playing the most important role in divertor plasma detachment is reviewed. The models used in the two-dimensional edge plasma transport codes that are widely used to address different issues of the edge plasma physics and to simulate the experimental data, as well as the numerical schemes and convergence issues, are described. The processes leading to ultimate divertor plasma detachment, the transition to and the stability of the detached regime, as well as the impact of the magnetic configuration and divertor geometry on detachment, are considered. A consistent, integral physical picture of ultimate detachment of a tokamak divertor plasma is developed.

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Section: Mechanisms Of Divertor Plasma Detachmentmentioning

confidence: 99%

Physics of ultimate detachment of a tokamak divertor plasma

Krasheninnikov¹,

2017

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“…18 This is due to the high toroidal magnetic field and the accompanying high plasma current density. Even in ohmic 1 MA plasmas the parallel power flow, q || , is of order 200 MW/m 2 , rising to > 500 MW/m 2 or more during high power heating 19 . Figure 7 is an example of the parallel heat flux profile.…”

Section: High Recycling Vs Detached Divertor Operationmentioning

confidence: 99%

“…19g) to increase f Rad . The nitrogen radiation builds up both in the divertor (shown in ref 19 ) and the core (Fig. 19c).…”

Section: Detachment Threshold and Its Modification (N E Icrf mentioning

confidence: 99%

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Divertor Physics Research on Alcator C-Mod

Lipschultz

LaBombard

Terry

et al. 2007

Fusion Science and Technology

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108

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“…following the initiation of the N 2 gas feed. The core plasma and pedestal regions are only slightly affected [48][49] . The drop in ion current to the outer plate is similar in magnitude to the Ohmic cases discussed earlier.…”

Section: Inferred Ion Source Changesmentioning

confidence: 99%

The role of particle sinks and sources in Alcator C-Mod detached divertor discharges

et al. 1999

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Detailed measurements of the magnitude and location of volumetric recombination occurring in the detached divertor of Alcator C-Mod tokamak [I.H. Hutchinson et al., Phys. Plasmas 1, 1511(1994] are presented. The drop in divertor plate ion current during detachment is due to two mechanisms: (1) volumetric recombination in the divertor plasma; and (2) reductions in the divertor ion source. Depending on plasma conditions, each of these can be the primary mechanism for the observed ion current reduction in detachment. The ion source during detachment is inferred and its magnitude is consistent with the measured divertor power flow. A scaling of the density in the divertor recombining region for L-(Low confinement) mode plasmas is found, n e,r ∝ n e 0.8 • P SOL 2/7 . A model based on pressure variation along a flux surface during detachment is consistent with the main features of this scaling.

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High confinement dissipative divertor operation on Alcator C-Mod

Cited by 44 publications

References 38 publications

Physics of ultimate detachment of a tokamak divertor plasma

Physics of ultimate detachment of a tokamak divertor plasma

Divertor Physics Research on Alcator C-Mod

The role of particle sinks and sources in Alcator C-Mod detached divertor discharges

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