Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas
Ohmic energy confinement saturation is found to be closely related to core toroidal rotation reversals in Alcator C-Mod tokamak plasmas. Rotation reversals occur at a critical density, depending on the plasma current and toroidal magnetic field, which coincides with the density separating the linear...
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| Veröffentlicht in: | Physics of plasmas 2012-05, Vol.19 (5), p.056106-056106-7 |
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| container_title | Physics of plasmas |
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| creator | Rice, J. E. Greenwald, M. J. Podpaly, Y. A. Reinke, M. L. Diamond, P. H. Hughes, J. W. Howard, N. T. Ma, Y. Cziegler, I. Duval, B. P. Ennever, P. C. Ernst, D. Fiore, C. L. Gao, C. Irby, J. H. Marmar, E. S. Porkolab, M. Tsujii, N. Wolfe, S. M. |
| description | Ohmic energy confinement saturation is found to be closely related to core toroidal rotation reversals in Alcator C-Mod tokamak plasmas. Rotation reversals occur at a critical density, depending on the plasma current and toroidal magnetic field, which coincides with the density separating the linear Ohmic confinement regime from the saturated Ohmic confinement regime. The rotation is directed co-current at low density and abruptly changes direction to counter-current when the energy confinement saturates as the density is increased. Since there is a bifurcation in the direction of the rotation at this critical density, toroidal rotation reversal is a very sensitive indicator in the determination of the regime change. The reversal and confinement saturation results can be unified, since these processes occur in a particular range of the collisionality. |
| doi_str_mv | 10.1063/1.3695213 |
| format | Article |
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E. ; Greenwald, M. J. ; Podpaly, Y. A. ; Reinke, M. L. ; Diamond, P. H. ; Hughes, J. W. ; Howard, N. T. ; Ma, Y. ; Cziegler, I. ; Duval, B. P. ; Ennever, P. C. ; Ernst, D. ; Fiore, C. L. ; Gao, C. ; Irby, J. H. ; Marmar, E. S. ; Porkolab, M. ; Tsujii, N. ; Wolfe, S. M.</creator><creatorcontrib>Rice, J. E. ; Greenwald, M. J. ; Podpaly, Y. A. ; Reinke, M. L. ; Diamond, P. H. ; Hughes, J. W. ; Howard, N. T. ; Ma, Y. ; Cziegler, I. ; Duval, B. P. ; Ennever, P. C. ; Ernst, D. ; Fiore, C. L. ; Gao, C. ; Irby, J. H. ; Marmar, E. S. ; Porkolab, M. ; Tsujii, N. ; Wolfe, S. M.</creatorcontrib><description>Ohmic energy confinement saturation is found to be closely related to core toroidal rotation reversals in Alcator C-Mod tokamak plasmas. Rotation reversals occur at a critical density, depending on the plasma current and toroidal magnetic field, which coincides with the density separating the linear Ohmic confinement regime from the saturated Ohmic confinement regime. The rotation is directed co-current at low density and abruptly changes direction to counter-current when the energy confinement saturates as the density is increased. Since there is a bifurcation in the direction of the rotation at this critical density, toroidal rotation reversal is a very sensitive indicator in the determination of the regime change. 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M.</creatorcontrib><title>Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas</title><title>Physics of plasmas</title><description>Ohmic energy confinement saturation is found to be closely related to core toroidal rotation reversals in Alcator C-Mod tokamak plasmas. Rotation reversals occur at a critical density, depending on the plasma current and toroidal magnetic field, which coincides with the density separating the linear Ohmic confinement regime from the saturated Ohmic confinement regime. The rotation is directed co-current at low density and abruptly changes direction to counter-current when the energy confinement saturates as the density is increased. Since there is a bifurcation in the direction of the rotation at this critical density, toroidal rotation reversal is a very sensitive indicator in the determination of the regime change. The reversal and confinement saturation results can be unified, since these processes occur in a particular range of the collisionality.</description><subject>ALCATOR DEVICE</subject><subject>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</subject><subject>COUNTER CURRENT</subject><subject>ELECTRIC CURRENTS</subject><subject>JOULE HEATING</subject><subject>MAGNETIC FIELDS</subject><subject>PLASMA CONFINEMENT</subject><subject>PLASMA DENSITY</subject><subject>ROTATION</subject><subject>TOROIDAL CONFIGURATION</subject><issn>1070-664X</issn><issn>1089-7674</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNp1kMtKAzEUhoMoWKsL3yDgysXU3CaT2QileINKNwruYpqLjcwkJYlC395pp1tX53D-jx_OB8A1RjOMOL3DM8rbmmB6AiYYibZqeMNO93uDKs7Zxzm4yPkbIcR4LSbgc7XpvYY22PS1gzoG54PtbSgwq_KTVPExQBXMECULS0zRG9XBFMsYJftrUx4uPsB5p9VAwEX1Gg3cdir3Kl-CM6e6bK-OcwreHx_eFs_VcvX0spgvK80wLRXmrVPGEGsZ46ZhgiBdK7YmzrF2bZxwjLdCt6Z2RhBmMeZEO0bousFWOUyn4Gbsjbl4mbUvVm-Gf4LVRRKCGkIFG6jbkdIp5pysk9vke5V2EiO5FyixPAoc2PuR3Zcdvv0fPliUo0V5tEj_AJwLeVU</recordid><startdate>20120501</startdate><enddate>20120501</enddate><creator>Rice, J. 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Rotation reversals occur at a critical density, depending on the plasma current and toroidal magnetic field, which coincides with the density separating the linear Ohmic confinement regime from the saturated Ohmic confinement regime. The rotation is directed co-current at low density and abruptly changes direction to counter-current when the energy confinement saturates as the density is increased. Since there is a bifurcation in the direction of the rotation at this critical density, toroidal rotation reversal is a very sensitive indicator in the determination of the regime change. The reversal and confinement saturation results can be unified, since these processes occur in a particular range of the collisionality.</abstract><cop>United States</cop><pub>American Institute of Physics</pub><doi>10.1063/1.3695213</doi><oa>free_for_read</oa></addata></record> |
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| subjects | ALCATOR DEVICE CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS COUNTER CURRENT ELECTRIC CURRENTS JOULE HEATING MAGNETIC FIELDS PLASMA CONFINEMENT PLASMA DENSITY ROTATION TOROIDAL CONFIGURATION |
| title | Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas |
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