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998 results on '"Petty, C."'

101. Enhanced localized energetic ion losses resulting from first-orbit linear and non-linear interactions with Alfvén eigenmodes in DIII-D

Author

Chen, X., primary, Heidbrink, W. W., additional, Kramer, G. J., additional, Van Zeeland, M. A., additional, Pace, D. C., additional, Petty, C. C., additional, Fisher, R. K., additional, Nazikian, R., additional, Zeng, L., additional, Austin, M. E., additional, Grierson, B. A., additional, and Podesta, M., additional

Published
2014
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102. Problems and benefits associated with consumer satisfaction evaluation at independent living centers

Author

Budde, James, Petty, C. Ray, and Nelson, Christopher

Subjects
Consumers -- Surveys, Market surveys -- Methods, Rehabilitation research -- Surveys, Self-care, Health -- Evaluation
Abstract

A frequently used measure of client satisfaction with the service and facilities provided by an independent living center is the consumer satisfaction evaluation, or CSE. The CSE measures the extent to which the provision of service gratifies consumer's wants and desires. Because CSE instruments have not been developed for the evaluation of independent living centers, various state agencies have developed their own questionnaires. Often these statistical instruments are developed in one location without complete understanding of the flaws and innate difficulties of such sampling methods. Problems establishing the validity of these in-house statistical instruments arise because their results are not comparable with those from other tests. A standardized instrument that could be generally used could be important in ensuring a consistent measure of the success or failure of independent living centers. The CSE is seen as an important and cost-effective beginning in obtaining information concerning the acceptability of independent living centers; however, the analysis is flawed by a lack of standard., Because of the strong emphasis on consumer involvement, consumer satisfaction evaluation (CSE) is often referenced as a means to obtain independent living center (ILC) evaluation information. This form of evaluation [...]

Published
1989

104. Physics of electron cyclotron current drive on DIII-D

Author

Petty, C C, Ellis, R A, Harvey, R W, Kinsey, J E, Lao, L L, Lohr, J, Luce, T C, Makowski, M A, and Prater, R

Subjects
Physics::Plasma Physics, Accelerators and Storage Rings
Abstract

OAK A271 PHYSICS OF ELECTRON CYCLOTRON CURRENT DRIVE ON DIII-D. Recent experiments on the DIII-D tokamak have focused on determining the effect of trapped particles on the electron cyclotron current drive (ECCD) efficiency. The measured ECCD efficiency increases as the deposition location is moved towards the inboard midplane or towards smaller minor radius for both co and counter injection. The measured ECCD efficiency also increases with increasing electron density and/or temperature. The experimental ECCD is compared to both the linear theory (Toray-GA) as well as a quasilinear Fokker-Planck model (CQL3D). The experimental ECCD is found to be in better agreement with the more complete Fokker-Planck calculation, especially for cases of high rf power density and/or loop voltage. The narrow width of the measured ECCD profile is consistent with only low levels of radial transport for the current carrying electrons.

Published
2002

105. 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
ELECTRON cyclotron resonance heating, ELECTRON cyclotron resonance sources, ION beams, TOROIDAL plasma
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<ρ<0.8, which is roughly the same region where the DBS and BES diagnostics show the increases in turbulent density fluctuations. Confinement of angular momentum is also reduced during ECH. Studies with the TGYRO transport solver show that the model of turbulent transport embodied in the TGLF code quantitatively reproduces the measured transport in both the neutral beam (NB)-only and in the NB plus EC cases. A simple model of the decrease in toroidal rotation with EC power is set forth, which exhibits a bifurcation in the rotational state of the discharge. [ABSTRACT FROM AUTHOR]

Published
2015
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106. Plasma auxiliary heating and current drive

Author

Jacquinot, J, Putvinski, S, Bosia, G, Fukuyama, A, Hemsworth, R, Konovalov, S, Nevins, W, Perkins, F, Rasumova, K, Romanelli, F, Tobita, K, Ushigusa, K, Van Dam, J, Vdovin, V, Zweben, S, Makowski, M, Koch, R, Wégrowe, J, Alikaev, V, Beaumont, B, Bécoulet, A, Bernabei, S, Bhatnagar, V, Brémond, S, Carter, M, Challis, C, Côté, A, D'Ippolito, D, Engelmann, F, Eriksson, L, Fujisawa, N, Giruzzi, G, Gormezano, C, Harvey, R, Heikkinen, J, Hellsten, T, Ikeda, Y, Jones, T, Kimura, H, Lloyd, B, Luce, T, Moreau, D, Naito, O, Nguyen, F, Noterdaeme, J, Ott, W, Petty, C, Polevoi, A, Prater, R, Rogers, J, Santini, F, Söldner, F, Stork, D, Thompson, E, Tonon, G, Tuccillo, A, Westerhof, E, Zohm, H, Post, D, Uckan, N, Azumi, M, Campbell, D, Ivanov, N, Sauthoff, N, Wakatani, M, and Righi, E

Subjects
Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin)
Published
1999

107. Experimental Tests of Confinement Scale Invariance on JET, DIID, ASDEX Upgrade and CMOD

Author

Christiansen, J., Budny, R., Cordey, J., Fuchs, J., Greenwald, M., Gruber, O., Hubbard, A., Hutchinson, I., Huysmans, G., Lomas, P., Lowry, C., Luce, T., Meister, H., Pena Hempel, S., Petty, C., Ryter, F., Salzmann, H., Schunke, B., Schweinzer, J., Stober, J., Suttrop, W., Thomsen, K., Tubbing, B., Wolfe, S., Alcator-C-Mod-Team, ASDEX-Upgrade Team, DIIID-Team, and JET-Team

Published
1999

108. Progress toward fully noninductive discharge operation in DIII-D using off-axis neutral beam injection

Author

Ferron, J. R., primary, Holcomb, C. T., additional, Luce, T. C., additional, Park, J. M., additional, Politzer, P. A., additional, Turco, F., additional, Heidbrink, W. W., additional, Doyle, E. J., additional, Hanson, J. M., additional, Hyatt, A. W., additional, In, Y., additional, La Haye, R. J., additional, Lanctot, M. J., additional, Okabayashi, M., additional, Petrie, T. W., additional, Petty, C. C., additional, and Zeng, L., additional

Published
2013
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109. Multi-field characteristics and eigenmode spatial structure of geodesic acoustic modes in DIII-D L-mode plasmas

Author

Wang, G., primary, Peebles, W. A., additional, Rhodes, T. L., additional, Austin, M. E., additional, Yan, Z., additional, McKee, G. R., additional, La Haye, R. J., additional, Burrell, K. H., additional, Doyle, E. J., additional, Hillesheim, J. C., additional, Lanctot, M. J., additional, Nazikian, R., additional, Petty, C. C., additional, Schmitz, L., additional, Smith, S., additional, Strait, E. J., additional, Van Zeeland, M., additional, and Zeng, L., additional

Published
2013
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110. Energetic ion transport by microturbulence is insignificant in tokamaks

Author

Pace, D. C., primary, Austin, M. E., additional, Bass, E. M., additional, Budny, R. V., additional, Heidbrink, W. W., additional, Hillesheim, J. C., additional, Holcomb, C. T., additional, Gorelenkova, M., additional, Grierson, B. A., additional, McCune, D. C., additional, McKee, G. R., additional, Muscatello, C. M., additional, Park, J. M., additional, Petty, C. C., additional, Rhodes, T. L., additional, Staebler, G. M., additional, Suzuki, T., additional, Van Zeeland, M. A., additional, Waltz, R. E., additional, Wang, G., additional, White, A. E., additional, Yan, Z., additional, Yuan, X., additional, and Zhu, Y. B., additional

Published
2013
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111. Experimental characterization of multiscale and multifield turbulence as a critical gradient threshold is surpassed in the DIII-D tokamak

Author

Hillesheim, J. C., primary, DeBoo, J. C., additional, Peebles, W. A., additional, Carter, T. A., additional, Wang, G., additional, Rhodes, T. L., additional, Schmitz, L., additional, McKee, G. R., additional, Yan, Z., additional, Staebler, G. M., additional, Burrell, K. H., additional, Doyle, E. J., additional, Holland, C., additional, Petty, C. C., additional, Smith, S. P., additional, White, A. E., additional, and Zeng, L., additional

Published
2013
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114. Observation of a Critical Gradient Threshold for Electron Temperature Fluctuations in the DIII-D Tokamak

Author

Hillesheim, J. C., primary, DeBoo, J. C., additional, Peebles, W. A., additional, Carter, T. A., additional, Wang, G., additional, Rhodes, T. L., additional, Schmitz, L., additional, McKee, G. R., additional, Yan, Z., additional, Staebler, G. M., additional, Burrell, K. H., additional, Doyle, E. J., additional, Holland, C., additional, Petty, C. C., additional, Smith, S. P., additional, White, A. E., additional, and Zeng, L., additional

Published
2013
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115. Role of density gradient driven trapped electron mode turbulence in the H-mode inner core with electron heating.

Author

Ernst, D. R., Burrell, K. H., Guttenfelder, W., Rhodes, T. L., Dimits, A. M., Bravenec, R., Grierson, B. A., Holland, C., Lohr, J., Marinoni, A., McKee, G. R., Petty, C. C., Rost, J. C., Schmitz, L., Wang, G., Zemedkun, S., and Zeng, L.

Subjects
AERODYNAMICS, FLUID dynamics, VENTILATION, ELECTRONS, PLASMA gases, CESIUM plasmas
Abstract

A series of DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] low torque quiescent H-mode experiments show that density gradient driven trapped electron mode (DGTEM) turbulence dominates the inner core of H-mode plasmas during strong electron cyclotron heating (ECH). Adding 3.4MW ECH doubles Te/Ti from 0.5 to 1.0, which halves the linear DGTEM critical density gradient, locally reducing density peaking, while transport in all channels displays extreme stiffness in the density gradient. This suggests that fusion α-heating may degrade inner core confinement in H-mode plasmas with moderate density peaking and low collisionality, with equal electron and ion temperatures, key conditions expected in burning plasmas. Gyrokinetic simulations using GYRO [J. Candy and R. E. Waltz, J. Comput. Phys. 186, 545 (2003)] (and GENE [Jenko et al., Phys. Plasmas 7, 1904 (2000)]) closely match not only particle, energy, and momentum fluxes but also density fluctuation spectra from Doppler backscattering (DBS), with and without ECH. Inner core DBS density fluctuations display discrete frequencies with adjacent toroidal mode numbers, which we identify as DGTEMs. GS2 [Dorland et al., Phys. Rev. Lett. 85, 5579 (2000)] predictions show the DGTEM can be suppressed, to avoid degradation with electron heating, by broadening the current density profile to attain q0 > qmin > 1. [ABSTRACT FROM AUTHOR]

Published
2016
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118. Electron profile stiffness and critical gradient studies

Author

DeBoo, J. C., primary, Petty, C. C., additional, White, A. E., additional, Burrell, K. H., additional, Doyle, E. J., additional, Hillesheim, J. C., additional, Holland, C., additional, McKee, G. R., additional, Rhodes, T. L., additional, Schmitz, L., additional, Smith, S. P., additional, Wang, G., additional, and Zeng, L., additional

Published
2012
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120. Hybrid-like 2/1 flux-pumping and magnetic island evolution due to edge localized mode-neoclassical tearing mode coupling in DIII-D

Author

King, J. D., primary, La Haye, R. J., additional, Petty, C. C., additional, Osborne, T. H., additional, Lasnier, C. J., additional, Groebner, R. J., additional, Volpe, F. A., additional, Lanctot, M. J., additional, Makowski, M. A., additional, Holcomb, C. T., additional, Solomon, W. M., additional, Allen, S. L., additional, Luce, T. C., additional, Austin, M. E., additional, Meyer, W. H., additional, and Morse, E. C., additional

Published
2012
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124. Multi-field/multi-scale turbulence response to electron cyclotron heating of DIII-D ohmic plasmas

Author

Wang, G., primary, Peebles, W. A., additional, Rhodes, T. L., additional, DeBoo, J. C., additional, Staebler, G. M., additional, Hillesheim, J. C., additional, Yan, Z., additional, McKee, G. R., additional, Petty, C. C., additional, Solomon, W. M., additional, Burrell, K. H., additional, Doyle, E. J., additional, Leonard, A. W., additional, Schmitz, L., additional, VanZeeland, M. A., additional, White, A. E., additional, and Zeng, L., additional

Published
2011
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125. Advances in validating gyrokinetic turbulence models against L- and H-mode plasmas

Author

Holland, C., primary, Schmitz, L., additional, Rhodes, T. L., additional, Peebles, W. A., additional, Hillesheim, J. C., additional, Wang, G., additional, Zeng, L., additional, Doyle, E. J., additional, Smith, S. P., additional, Prater, R., additional, Burrell, K. H., additional, Candy, J., additional, Waltz, R. E., additional, Kinsey, J. E., additional, Staebler, G. M., additional, DeBoo, J. C., additional, Petty, C. C., additional, McKee, G. R., additional, Yan, Z., additional, and White, A. E., additional

Published
2011
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127. Contributions of Electron Cyclotron Waves to Performance in Advanced Regimes on DIII-D

Author

Petty, C. C., primary, Austin, M. E., additional, Brennan, D. P., additional, Burrell, K. H., additional, DeBoo, J. C., additional, Doyle, E. J., additional, Ferron, J. R., additional, Garofalo, A. M., additional, Hillesheim, J. C., additional, Holcomb, C. T., additional, Holland, C., additional, Hyatt, A. W., additional, In, Y., additional, Jackson, G. L., additional, Lohr, J., additional, Luce, T. C., additional, Makowski, M. A., additional, Murakami, M., additional, Okabayashi, M., additional, Politzer, P. A., additional, Prater, R., additional, Reimerdes, H., additional, Rhodes, T. L., additional, Schmitz, L., additional, Smith, S. P., additional, Solomon, W. M., additional, Staebler, G. M., additional, Takahashi, R., additional, Turco, F., additional, Turnbull, A. D., additional, Van Zeeland, M. A., additional, Wang, G., additional, White, A. E., additional, Zeng, L., additional, Phillips, Cynthia K., additional, and Wilson, James R., additional

Published
2011
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132. Mechanisms for generating toroidal rotation in tokamaks without external momentum input

Author

Solomon, W. M., primary, Burrell, K. H., additional, Garofalo, A. M., additional, Kaye, S. M., additional, Bell, R. E., additional, Cole, A. J., additional, deGrassie, J. S., additional, Diamond, P. H., additional, Hahm, T. S., additional, Jackson, G. L., additional, Lanctot, M. J., additional, Petty, C. C., additional, Reimerdes, H., additional, Sabbagh, S. A., additional, Strait, E. J., additional, Tala, T., additional, and Waltz, R. E., additional

Published
2010
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133. Measurements of the cross-phase angle between density and electron temperature fluctuations and comparison with gyrokinetic simulations

Author

White, A. E., primary, Peebles, W. A., additional, Rhodes, T. L., additional, Holland, C. H., additional, Wang, G., additional, Schmitz, L., additional, Carter, T. A., additional, Hillesheim, J. C., additional, Doyle, E. J., additional, Zeng, L., additional, McKee, G. R., additional, Staebler, G. M., additional, Waltz, R. E., additional, DeBoo, J. C., additional, Petty, C. C., additional, and Burrell, K. H., additional

Published
2010
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134. Probing plasma turbulence by modulating the electron temperature gradient

Author

DeBoo, J. C., primary, Holland, C., additional, Rhodes, T. L., additional, Schmitz, L., additional, Wang, G., additional, White, A. E., additional, Austin, M. E., additional, Doyle, E. J., additional, Hillesheim, J., additional, Peebles, W. A., additional, Petty, C. C., additional, Yan, Z., additional, and Zeng, L., additional

Published
2010
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139. Validation of on- and off-axis neutral beam current drive against experiment in DIII-D

Author

Park, J. M., primary, Murakami, M., additional, Petty, C. C., additional, Heidbrink, W. W., additional, Osborne, T. H., additional, Holcomb, C. T., additional, Van Zeeland, M. A., additional, Prater, R., additional, Luce, T. C., additional, Wade, M. R., additional, Austin, M. E., additional, Brooks, N. H., additional, Budny, R. V., additional, Challis, C. D., additional, DeBoo, J. C., additional, deGrassie, J. S., additional, Ferron, J. R., additional, Gohil, P., additional, Hobirk, J., additional, Hollmann, E. M., additional, Hong, R. M., additional, Hyatt, A. W., additional, Lohr, J., additional, Lanctot, M. J., additional, Makowski, M. A., additional, McCune, D. C., additional, Politzer, P. A., additional, St John, H. E., additional, Suzuki, T., additional, West, W. P., additional, Unterberg, E. A., additional, and Yu, J. H., additional

Published
2009
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143. Erratum: “Sawtooth oscillations in shaped plasmas” [Phys. Plasmas 14, 055701 (2007)]

Author

Lazarus, E. A., primary, Luce, T. C., additional, Austin, M. E., additional, Brennan, D. P., additional, Burrell, K. H., additional, Chu, M. S., additional, Ferron, J. R., additional, Hyatt, A. W., additional, Jayakumar, R. J., additional, Lao, L. L., additional, Lohr, J., additional, Makowski, M. A., additional, Osborne, T. H., additional, Petty, C. C., additional, Politzer, P. A., additional, Prater, R., additional, Rhodes, T. L., additional, Scoville, J. T., additional, Solomon, W. M., additional, Strait, E. J., additional, Turnbull, A. D., additional, Waelbroeck, F. L., additional, and Zhang, C., additional

Published
2008
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146. Reversed shear Alfvén eigenmode stabilization by localized electron cyclotron heating

Author

Van Zeeland, M A, primary, Heidbrink, W W, additional, Nazikian, R, additional, Solomon, W M, additional, Austin, M E, additional, Berk, H L, additional, Gorelenkov, N N, additional, Holcomb, C T, additional, Hyatt, A W, additional, Kramer, G J, additional, Lohr, J, additional, Makowski, M A, additional, McKee, G R, additional, Petty, C C, additional, Sharapov, S E, additional, and Rhodes, T L, additional

Published
2008
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147. Momentum confinement at low torque

Author

Solomon, W M, primary, Burrell, K H, additional, deGrassie, J S, additional, Budny, R, additional, Groebner, R J, additional, Kinsey, J E, additional, Kramer, G J, additional, Luce, T C, additional, Makowski, M A, additional, Mikkelsen, D, additional, Nazikian, R, additional, Petty, C C, additional, Politzer, P A, additional, Scott, S D, additional, Van Zeeland, M A, additional, and Zarnstorff, M C, additional

Published
2007
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148. Broad wavenumber turbulence and transport during Ohmic and electron cyclotron heating in the DIII-D tokamak

Author

Rhodes, T L, primary, Peebles, W A, additional, DeBoo, J C, additional, Prater, R, additional, Kinsey, J E, additional, Staebler, G M, additional, Candy, J, additional, Austin, M E, additional, Bravenec, R V, additional, Burrell, K H, additional, deGrassie, J S, additional, Doyle, E J, additional, Gohil, P, additional, Greenfield, C M, additional, Groebner, R J, additional, Lohr, J, additional, Makowski, M A, additional, Nguyen, X V, additional, Petty, C C, additional, Solomon, W M, additional, St John, H E, additional, Van Zeeland, M A, additional, Wang, G., additional, and Zeng, L, additional

Published
2007
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149. 5114

Author

Johnson, W. E., Petty, C. M., and Waterhouse, W. C.

Published
1964
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150. Sawtooth oscillations in shaped plasmas

Author

Lazarus, E. A., primary, Luce, T. C., additional, Austin, M. E., additional, Brennan, D. P., additional, Burrell, K. H., additional, Chu, M. S., additional, Ferron, J. R., additional, Hyatt, A. W., additional, Jayakumar, R. J., additional, Lao, L. L., additional, Lohr, J., additional, Makowski, M. A., additional, Osborne, T. H., additional, Petty, C. C., additional, Politzer, P. A., additional, Prater, R., additional, Rhodes, T. L., additional, Scoville, J. T., additional, Solomon, W. M., additional, Strait, E. J., additional, Turnbull, A. D., additional, Waelbroeck, F. L., additional, and Zhang, C., additional

Published
2007
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