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33 results on '"Erents, K."'

10. ELMy H-modes in JET helium-4 plasmas.

Author

McDonald, D. C., Cordey, J. G., Righi, E., Ryter, F., Saibene, G., Sartori, R., Alper, B., Becoulet, M., Brzozowski, J., Coffey, I., De Baar, M., De Vries, P., Erents, K., Fundamenski, W., Giroud, C., Jenkins, I., Loarte, A., Lomas, P. J., Maddison, G. P., and Mailloux, J.

Published
2004

11. Localized bulk electron heating with ICRF mode conversion in the JET tokamak.

Author

Mantsinen, M. J., Mayoral, M.-L., Van Eester, D., Alper, B., Barnsley, R., Beaumont, P., Bucalossi, J., Coffey, I., Conroy, S., De Baar, M., De Vries, P., Erents, K., Figueiredo, A., Gondhalekar, A., Gowers, C., Hellsten, T., Joffrin, E., Kiptily, V., Lamalle, P. U., and Lawson, K.

Published
2004

13. Progress in internal transport barrier plasmas with lower hybrid current drive and heating in JET (Joint European Torus).

Author

Mailloux, J., Alper, B., Baranov, Y., Becoulet, A., Cardinali, A., Castaldo, C., Cesario, R., Conway, G., Challis, C. D., Crisanti, F., de Baar, M., de Vries, P., Ekedahl, A., Erents, K., Gowers, C., Hawkes, N. C., Hogeweij, G. M. D., Imbeaux, F., Joffrin, E., and Litaudon, X.

Subjects
INTERNAL waves, PLASMA astrophysics
Abstract

In optimized shear plasmas in the Joint European Torus [P. H. Rebut and B. E. Keen, Fusion Technol. 11, 13 (1987)], safety factor (q) profiles with negative magnetic shear are produced by applying lower hybrid (LH) waves during the plasma current ramp-up phase. These plasmas produce a barrier to the electron energy transport. The radius at which the barrier is located increases with the LH wave power. When heated with high power from ion cyclotron resonance heating and neutral beam injection, they can additionally produce transient internal transport barriers (ITBs) seen on the ion temperature, electron density, and toroidal rotation velocity profiles. Due to recent improvements in coupling, q profile control with LH current drive in ITB plasmas with strong combined heating can be explored. These new experiments have led to ITBs sustained for several seconds by the LH wave. Simulations show that the current driven by the LH waves peaks at the ITB location, indicating that it can act in the region of low magnetic shear. © 2002 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2002

14. Isotope identity experiments in JET.

Author

Cordey, J G, Alper, B, Budny, R, Christiansen, J P, Coffey, I, Erents, K, Harbour, P, Horton, L D, Lawson, K, Matthews, G F, Saibene, G, Sartori, R, Strachan, J, and Thomsen, K

Published
2000
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15. Characterization of the frequency ranges of the plasma edge fluctuation spectra.

Author

Carreras, B. A., Balbin, R., van Milligen, B., Pedrosa, M.A., Garcia-Cortes, I., Sanchez, E., Hidalgo, C., Bleuel, J., Endler, M., Thomsen, H., Chankin, A., Davies, S., Erents, K., and Matthews, G.F.

Subjects
FREQUENCY spectra, FLUCTUATIONS (Physics)
Abstract

Identifies the frequency ranges characterized by a power dependence. Frequency spectra of fluctuations for the ion saturation current, floating potential and turbulent transport measured in the plasma edge of plasma confinement experiments; Intermediate frequency region; Effect of plasma rotation on the decay indices; Self-similarity of the fluctuations and fluxes.

Published
1999
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16. Fluctuation measurements using a five-pin triple probe in the Joint European Torus boundary plasma.

Author

Silva, C., Gonçalves, B., Hidalgo, C., Pedrosa, M. A., Erents, K., Matthews, G., and Pitts, R. A.

Subjects
PLASMA gases, ELECTRON temperature, ENERGY dissipation, FLUCTUATIONS (Physics), PARTICLES (Nuclear physics), STOCHASTIC processes
Abstract

A multi-probe system has been developed to investigate the importance of electron temperature fluctuations turbulent transport in the Joint European Torus boundary plasma. The compact five-pin triple probe has been designed to reduce the phase delay of fluctuations due to the finite pin separation in the standard triple probe technique, while still avoiding the effects of probe shadowing. This probe has been found to have advantages over the standard triple probe in the region close to the separatrix (r-rsep<0.01 m), where the fluctuation wavelength is large. Importantly, results obtained with the probe support the standard estimation of cross-field particle flux, which ignores temperature fluctuations. They cannot be ignored, however, in the estimation of energy losses since measurements show that the conducted energy may be as large as the convected component. [ABSTRACT FROM AUTHOR]

Published
2004
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17. Velocity fluctuations and time dependent E×B flows in the JET boundary region.

Author

Gonçalves, B., Hidalgo, C., Pedrosa, M. A., Silva, C., Erents, K., and Mathews, G.

Subjects
PLASMA gases, SCIENTIFIC apparatus & instruments
Abstract

Fluctuations in the phase velocity of fluctuations have been computed from floating potential fluctuations in the JET plasma boundary region. Experimental results reinforce the idea that, in some conditions, fluctuations in the phase velocity are linked with fluctuations in radial-poloidal electric fields opening the possibility to investigate turbulent transport in the plasma core region from measurements of density fluctuations. These results indicate that time dependent radial electric fields and E × B shearing rates might be computed in the plasma core from measurement of density fluctuations. [ABSTRACT FROM AUTHOR]

Published
2003

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