Correlations of heat and momentum transport in the TFTR tokamak

Journal Article · Mon Jan 01 00:00:00 EST 1990 · Physics of Fluids. B, Plasma Physics

DOI:https://doi.org/10.1063/1.859545· OSTI ID:7094095

Scott, S. D.; Arunasalam, V.; Barnes, C. W.; Bell, M. G.; Bitter, M.; Boivin, R.; Bretz, N. L.; Budny, R.; Bush, C. E.; Cavallo, A.; Chu, T. K.; Cohen, S. A.; Colestock, P.; Davis, S. L.; Dimock, D. L.; Dylla, H. F.; Efthimion, P. C.; Erhrardt, A. B.; Fonck, R. J.; Fredrickson, E. ; Furth, H. P.; Goldston, R. J.; Greene, G.; Grek, B.; Grisham, L. R.; Hammett, G.; Hawryluk, R. J.; Hendel, H. W.; Hill, K. W.; Hinnov, E.; Hoffman, D. J.; Hosea, J.; Howell, R. B.; Hsuan, H.; Hulse, R. A.; Jaehnig, K. P.; Janos, A. C.; Jassby, D.; Jobes, F.; Johnson, D. W.; Johnson, L. C.; Kaita, R.; Kieras-Phillips, C.; Kilpatrick, S. J.; LaMarche, P. H.; LeBlanc, B.; Little, R.; Manos, D. M.; Mansfield, D. K.; Mazzucato, E.; McCarthy, M. P.; McCune, D. C.; McGuire, K.; McNeill, D. H.; Meade, D. M.; Medley, S. S.; Mikkelsen, D. R.; Motley, R.; Mueller, D.; Murphy, J. A.; Nagayama, Y.; Nazakian, R.; Owens, D. K.; Park, H.; Ramsey, A. T.; Redi, M. H.; Roquemore, A. L.; Rutherford, P. H.; Schilling, G.; Schivell, J.; Schmidt, G. L.; Stevens, J.; Stratton, B. C.; Stodiek, W.; Synakowski, E. J.; Tang, W. M.; Taylor, G.; Timberlake, J. R.; Towner, H. H.; Ulrickson, M.; von Goeler, S.; Wieland, R.; Williams, M.; Wilson, J. R.; Wong, K.-L.; Yoshikawa, S.; Young, K. M.; Zarnstorff, M. C.; Zweben, S. J.

Measurements of the toroidal rotation speed v _φ (r) driven by neutral beam injection in tokamak plasmas and, in particular, simultaneous profile measurements of v _φ, T_i, T_e, and n_e, have provided new insights into the nature of anomalous transport in tokamaks. Low-recycling plasmas heated with unidirectional neutral beam injection exhibit a strong correlation among the local diffusivities, χ_φ≈χ_i}>χ_e. Recent measurements have confirmed similar behavior in broad-density L-mode plasmas. These results are consistent with the conjecture that electrostatic turbulence is the dominant transport mechanism in the tokamak fusion test reactor tokamak (TFTR) (Phys. Rev. Lett. 58, 1004 (1987)), and are inconsistent with predictions both from test-particle models of strong magnetic turbulence and from ripple transport. Toroidal rotation speed measurements in peaked-density TFTR supershots'' with partially unbalanced beam injection indicate that momentum transport decreases as the density profile becomes more peaked. In high-temperature, peaked-density plasmas the observed gradient scale length parameter η ^tot _i=d ln T _i/d ln n _e correlates reasonably well with predictions of the threshold for exciting ion-temperature-gradient-driven turbulence (ITGDT), as would be expected for plasmas at marginal stability with respect to this strong transport mechanism. In L-mode plasmas where ITGDT is expected to be too weak to enforce marginal stability, η^tot_i exceeds this threshold considerably.

• Research Organization: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 7094095
• Journal Information: Physics of Fluids. B, Plasma Physics, Vol. 2, Issue 6; ISSN 0899-8221: PFBPEI
• Publisher: American Institute of Physics
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
PLASMA
HEAT TRANSFER
TFTR TOKAMAK
PLASMA HEATING
ELECTRON TEMPERATURE
ION TEMPERATURE
MOMENTUM TRANSFER
NEUTRAL ATOM BEAM INJECTION
OSCILLATION MODES
PLASMA DIAGNOSTICS
ROTATION
THRESHOLD ENERGY
TOROIDAL CONFIGURATION
ANNULAR SPACE
BEAM INJECTION
CLOSED CONFIGURATIONS
CONFIGURATION
ENERGY
ENERGY TRANSFER
HEATING
MAGNETIC FIELD CONFIGURATIONS
MOTION
SPACE
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
700101* - Fusion Energy- Plasma Research- Confinement
Heating
& Production
700103 - Fusion Energy- Plasma Research- Kinetics
700102 - Fusion Energy- Plasma Research- Diagnostics