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10 results on '"Rost, J.C."'

2. Application of ECH to the Study of Transport in ITER Baseline Scenario-like Discharges in DIII-D

Author

Pinsker R.I., Austin M.E., Ernst D.R., Garofalo A.M., Grierson B.A., Hosea J.C., Luce T.C., Marinoni A., McKee G.R., Perkins R.J., Petty C.C., Porkolab M., Rost J.C., Schmitz L., Solomon W.M., Taylor G., and Turco F.

Subjects
Physics, QC1-999
Abstract

Recent DIII-D experiments in the ITER Baseline Scenario (IBS) have shown strong increases in fluctuations and correlated reduction of confinement associated with entering the electron-heating-dominated regime with strong electron cyclotron heating (ECH). The addition of 3.2 MW of 110 GHz EC power deposited at ρ∼0.42 to IBS discharges with ∼3 MW of neutral beam injection causes large increases in low-k and medium-k turbulent density fluctuations observed with Doppler backscatter (DBS), beam emission spectroscopy (BES) and phase-contrast imaging (PCI) diagnostics, correlated with decreases in the energy, particle, and momentum confinement times. Power balance calculations show the electron heat diffusivity χe increases significantly in the mid-radius region 0.4

Published
2015
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5. Improved understanding of physics processes in pedestal structure, leading to improved predictive capability for ITER

Author

Groebner, R.J., primary, Chang, C.S., additional, Hughes, J.W., additional, Maingi, R., additional, Snyder, P.B., additional, Xu, X.Q., additional, Boedo, J.A., additional, Boyle, D.P., additional, Callen, J.D., additional, Canik, J.M., additional, Cziegler, I., additional, Davis, E.M., additional, Diallo, A., additional, Diamond, P.H., additional, Elder, J.D., additional, Eldon, D.P., additional, Ernst, D.R., additional, Fulton, D.P., additional, Landreman, M., additional, Leonard, A.W., additional, Lore, J.D., additional, Osborne, T.H., additional, Pankin, A.Y., additional, Parker, S.E., additional, Rhodes, T.L., additional, Smith, S.P., additional, Sontag, A.C., additional, Stacey, W.M., additional, Walk, J., additional, Wan, W., additional, Wang, E.H.-J., additional, Watkins, J.G., additional, White, A.E., additional, Whyte, D.G., additional, Yan, Z., additional, Belli, E.A., additional, Bray, B.D., additional, Candy, J., additional, Churchill, R.M., additional, Deterly, T.M., additional, Doyle, E.J., additional, Fenstermacher, M.E., additional, Ferraro, N.M., additional, Hubbard, A.E., additional, Joseph, I., additional, Kinsey, J.E., additional, LaBombard, B., additional, Lasnier, C.J., additional, Lin, Z., additional, Lipschultz, B.L., additional, Liu, C., additional, Ma, Y., additional, McKee, G.R., additional, Ponce, D.M., additional, Rost, J.C., additional, Schmitz, L., additional, Staebler, G.M., additional, Sugiyama, L.E., additional, Terry, J.L., additional, Umansky, M.V., additional, Waltz, R.E., additional, Wolfe, S.M., additional, Zeng, L., additional, and Zweben, S.J., additional

Published
2013
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6. Progress towards increased understanding and control of internal transport barriers in DIII-D

Author

Doyle, E.J, primary, Greenfield, C.M, additional, Austin, M.E, additional, Baylor, L.R, additional, Burrell, K.H, additional, Casper, T.A, additional, DeBoo, J.C, additional, Ernst, D.R, additional, Fenzi, C, additional, Gohil, P, additional, Groebner, R.J, additional, Heidbrink, W.W, additional, Jackson, G.L, additional, Jernigan, T.C, additional, Kinsey, J.E, additional, Lao, L.L, additional, Makowski, M, additional, McKee, G.R, additional, Murakami, M, additional, Peebles, W.A, additional, Porkolab, M, additional, Prater, R, additional, Rettig, C.L, additional, Rhodes, T.L, additional, Rost, J.C, additional, Staebler, G.M, additional, Stallard, B.W, additional, Strait, E.J, additional, Synakowski, E.J, additional, Thomas, D.M, additional, Wade, M.R, additional, Waltz, R.E, additional, and Zeng, L, additional

Published
2002
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7. Progress in quantifying the edge physics of the H mode regime in DIII-D

Author

Groebner, R.J, primary, Baker, D.R, additional, Burrell, K.H, additional, Carlstrom, T.N, additional, Ferron, J.R, additional, Gohil, P, additional, Lao, L.L, additional, Osborne, T.H, additional, Thomas, D.M, additional, West, W.P, additional, Boedo, J.A, additional, Moyer, R.A, additional, McKee, G.R, additional, Deranian, R.D, additional, Doyle, E.J, additional, Rettig, C.L, additional, Rhodes, T.L, additional, and Rost, J.C, additional

Published
2001
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8. Physics of confinement improvement of plasmas with impurity injection in DIII-D

Author

Murakami, M, primary, McKee, G.R, additional, Jackson, G.L, additional, Staebler, G.M, additional, Alexander, D.A, additional, Baker, D.R, additional, Bateman, G, additional, Baylor, L.R, additional, Boedo, J.A, additional, Brooks, N.H, additional, Burrell, K.H, additional, Cary, J.R, additional, Cohen, R.H, additional, Colchin, R.J, additional, DeBoo, J.C, additional, Doyle, E.J, additional, Ernst, D.R, additional, Evans, T.E, additional, Fenzi, C, additional, Greenfield, C.M, additional, Greenwood, D.E, additional, Groebner, R.J, additional, Hogan, J.T, additional, Houlberg, W.A, additional, Hyatt, A.W, additional, Jayakumar, R, additional, Jernigan, T.C, additional, Jong, R.A, additional, Kinsey, J.E, additional, Kritz, A.H, additional, Haye, R.J. La, additional, Lao, L.L, additional, Lasnier, C.J, additional, Makowski, M.A, additional, Mandrekas, J, additional, Messiaen, A.M, additional, Moyer, R.A, additional, Ongena, J, additional, Pankin, A, additional, Petrie, T.W, additional, Petty, C.C, additional, Rettig, C.L, additional, Rhodes, T.L, additional, Rice, B.W, additional, Ross, D.W, additional, Rost, J.C, additional, Shasharina, S.G, additional, John, H.E. St, additional, Stacey, W.M, additional, Strand, P.I, additional, Sydora, R.D, additional, Taylor, T.S, additional, Thomas, D.M, additional, Wade, M.R, additional, Waltz, R.E, additional, West, W.P, additional, Wong, K.L, additional, Zeng, L, additional, and Team, DIII-D, additional

Published
2001
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9. Quiescent double barrier high-confinement mode plasmas in the DIII-D tokamak.

Author

Burrell, K. H., Austin, M. E., Brennan, D. P., DeBoo, J. C., Doyle, E. J., Fenzi, C., Fuchs, C., Gohil, P., Greenfield, C. M., Groebner, R. J., Lao, L. L., Luce, T. C., Makowski, M. A., McKee, G. R., Moyer, R. A., Petty, C. C., Porkolab, M., Rettig, C. L., Rhodes, T. L., and Rost, J.C.

Subjects
PLASMA gases, TOKAMAKS, PLASMA oscillations, MAGNETOHYDRODYNAMICS
Abstract

High-confinement (H-mode) operation is the choice for next-step tokamak devices based either on conventional or advanced tokamak physics. This choice, however, comes at a significant cost for both the conventional and advanced tokamaks because of the effects of edge localized modes (ELMs). ELMs can produce significant erosion in the divertor and can affect the beta limit and reduced core transport regions needed for advanced tokamak operation. Experimental results from DIII-D [J. L. Luxon et al., Plasma Physics and Controlled Nuclear Fusion Research 1986 (Intemational Atomic Energy Agency, Vienna, 1987), Vol. I, p. 159] this year have demonstrated a new operating regime, the quiescent H-mode regime, which solves these problems. We have achieved quiescent H-mode operation that is ELM-free and yet has good density and impurity control. In addition, we have demonstrated that an internal transport barrier can be produced and maintained inside the H-mode edge barrier for long periods of time (>3.5 s or >25 energy confinement times τ[sub E]), yielding a quiescent double barrier regime. By slowly ramping the input power, we have achieved β[sub N]H[sub 89]:7 for up to 5 times the τ[sub E] of 150 ms. β[sub N]H[sub 89] values of 7 substantially exceed the value of 4 routinely achieved in the standard ELMing H mode. The key factors in creating the quiescent H-mode operation are neutral beam injection in the direction opposite to the plasma current (counter injection) plus cryopumping to reduce the density. Density and impurity control in the quiescent H mode is possible because of the presence of an edge magnetohydrodynamic (MHD) oscillation, the edge harmonic oscillation, which enhances the edge particle transport while leaving the energy transport unaffected. [ABSTRACT FROM AUTHOR]

Published
2001
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