Neutral-Beam-Heating Results from the Princeton Large Torus

Eubank, H. P.; Goldston, Robert James; Arunasalam, V.; Bitter, M.; Bol, K.; Boyd, D. A.; Bretz, N.; Bussac, J.; Cohen, S.A.; Colestock, P.; Davis, S.; Dimock, D.; Dylla, H. F.; Efthimion, P. C.; Grisham, L.; Hawryluk, R. J.; Hill, K. W.; Hinnov, E.; Hosea, J.; Hsuan, H.; Johnson, D.; Martín, G.; Medley, S.; Meservey, E.; Sauthoff, N.; Schilling, G.; Shivell, J.; Schmidt, G. L.; Stauffer, F. J.; Stewart, L.D.; Stodiek, W.; Stooksberry, R. W.; Strachan, J.; Suckewer, S.; Takahashi, H.; Tait, G. D.; Ulrickson, M.; Goeler, S. von; Yamada, Masaki; Tsai, C. C.; Stirling, W. L.; Dagenhart, W. K.; Menon, M. M.; Haselton, H.H.

doi:10.1103/physrevlett.43.270

Cited by 113 publications

(45 citation statements)

References 2 publications

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“…>> k..v./u) and the fluid-ion 2 2 2 approximation k |j v i /w << 1. Equations (5), (8), (9), and (10), together with quasi-neutrality, yeild the eigenmode equation in the slab geometry ( (1+u *pi /u)p s V i " 1 + u *e /^ + ( 1 + U ) *pi/ U ) k 1 f c s/ U j 2 )* = 0 and, again, we have instabilities though not purely growing.…”

Section: Y-^o = Ye + Y D I 'mentioning

confidence: 79%

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Ion-temperature-gradient instability in toroidal plasmas

Guzdar

1983

The Physics of Fluids

116

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The stability of the ion-temperature-gradient mode in a toroidal plasma is investigated. Using the ballooning-mode formalism, an ordinary differencedifferential equation is derived which includes ful kinetic effects. The equation is, then, examined in various limits where it reduces to an ordinary differen tial equation. Analytic and computational studies show that, for n. = dlnT./dlnn >1, toroidal effects further destabilize the mode and, hence, the corresponding growth rates exceed those obtained from the slab calculations.

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Section: Y-^o = Ye + Y D I 'mentioning

confidence: 79%

“…Equations (15) and (16) correspond, respectively, to the small K u limits of Eqs. (8) and (9). In Eq.…”

Section: Y-^o = Ye + Y D I 'mentioning

confidence: 99%

Ion-temperature-gradient instability in toroidal plasmas

Guzdar

1983

The Physics of Fluids

116

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“…The carbon and deuterium temperatures are in reasonable agreement over most of the profile, except the points near the magnetic axis. There may be an "isotope effect" 60,61 occurring near R % 1:85 m where the ion-ion collision time is nearly 20 ms. Near the magnetic axis, the beam ion density is maximized and can couple more strongly to the higher Z carbon ions, resulting in a slightly higher temperature. However, points in the strong gradient region, R ¼ 1:9 À 2:1 m are in good agreement.…”

Section: Bulk Ion Toroidal Rotation In the Presence Of An Internmentioning

confidence: 99%

Measurements of the deuterium ion toroidal rotation in the DIII-D tokamak and comparison to neoclassical theory

et al. 2012

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Bulk ion toroidal rotation plays a critical role in controlling microturbulence and MHD stability as well as yielding important insight into angular momentum transport and the investigation of intrinsic rotation. So far, our understanding of bulk plasma flow in hydrogenic plasmas has been inferred from impurity ion velocity measurements and neoclassical theoretical calculations. However, the validity of these inferences has not been tested rigorously through direct measurement of the main-ion rotation in deuterium plasmas, particularly in regions of the plasma with steep pressure gradients where very large differences can be expected between bulk ion and impurity rotation. New advances in the analysis of wavelength-resolved D a emission on the DIII-D tokamak [J. L. Luxon et al., Fusion Sci. Technol. 48, 807 (2002)] have enabled accurate measurements of the main-ion (deuteron) temperature and toroidal rotation. The D a emission spectrum is accurately fit using a model that incorporates thermal deuterium charge exchange, beam emission, and fast ion D a (FIDA) emission spectra. Simultaneous spectral measurements of counter current injected and co current injected neutral beams permit a direct determination of the deuterium toroidal velocity. Time-dependent collisional radiative modeling of the photoemission process is in quantitative agreement with measured spectral characteristics. L-mode discharges with low beam ion densities and broad thermal pressure profiles exhibit deuteron temperature and toroidal rotation velocities similar to carbon. However, intrinsic rotation H-mode conditions and plasmas with internal transport barriers exhibit differences between core deuteron and carbon rotation which are inconsistent with the sign and magnitude of the neoclassical predictions. V C 2012 American Institute of Physics. [http://dx

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“…Auxiliary heated discharges gave rise to the so-called L-mode confinement regime in which the energy confinement time is reduced from what was experienced during ohmic heating (see e.g. [269] for an early report of this phenomena; a more recent summary of L-mode transport could be found in [28]). The results from ISX-B, summarized in the preceding paragraphs, illustrate this phenomenon via turbulence measurements.…”

Section: Parametric Studies Of Particle and Heat Fluxesmentioning

confidence: 99%

A review of experimental drift turbulence studies

Tynan¹,

Fujisawa²,

McKee³

2009

Plasma Phys. Control. Fusion

179

167

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Experimental drift turbulence and zonal flow studies in magnetically confined plasma experiments are reviewed. The origins of drift waves, transition to drift turbulence and drift turbulence-zonal flow interactions in open field line and toroidal closed flux surface experiments are discussed and the free energy sources, dissipation mechanisms and nonlinear dynamics of drift turbulence in the core, edge and scrape-off layer plasma regions are examined. Evidence that turbulence across these regions is linked and that turbulence-driven zonal flows exist is presented, and evidence that these flows help regulate the turbulent scale lengths, amplitude and fluxes is summarized. Seemingly contradictory reports exist regarding the scale of turbulent transport events; gyro-Bohm behavior of turbulence correlation lengths as well as evidence for long-range transport phenomena both exist. Changes in turbulence during and after transport barrier formation are summarized and compared. The inferred turbulent particle and heat fluxes due to turbulent transport are usually consistent with global confinement, and edge plasma momentum transport appears to be linked to plasma flows at the last-closed flux surface and in the open field line region. However, inconsistencies between observed transport and turbulence have sometimes been reported and are pointed out here. Special attention is given to open issues, and suggestions for future experimental studies are given.

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Neutral-Beam-Heating Results from the Princeton Large Torus

Cited by 113 publications

References 2 publications

Ion-temperature-gradient instability in toroidal plasmas

Ion-temperature-gradient instability in toroidal plasmas

Measurements of the deuterium ion toroidal rotation in the DIII-D tokamak and comparison to neoclassical theory

A review of experimental drift turbulence studies

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