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28 results on '"Tennfors, E."'

2. Observations of toroidicity-induced Alfvén eigenmodes (TAE) in RFP plasmas

Author

Regnoli G, Bergsåker H, Tennfors E, Zonca F, Martines E, Spolaore M, Vianello N, Serianni G, Cecconello M, Malmberg JA, Antoni V, Regnoli, G, Bergsåker, H, Tennfors, E, Zonca, F, Martines, E, Spolaore, M, Vianello, N, Serianni, G, Cecconello, M, Malmberg, J, and Antoni, V

Subjects
T2, RFP, reversed field pinch, TAE, RFX, toroidal alfven eigenmodes
Published
2003

3. Fast Wave Current Drive and Direct Electron Heating in JET ITB Plasmas

Author

Hellsten, T., Laxaback, M., Bergkvist, T., Johnson, T., Mantsinen, M., Matthews, G., Meo, F., Nguyen, F., Noterdaeme, J., Petty, C., Tala, T., Van Eester, D., Andrew, P., Beaumont, P., Bobkov, V., Brix, M., Brzozowski, J., Eriksson, L., Giroud, C., Joffrin, E., Kiptily, V., Mailloux, J., Mayoral, M., Monakhov, I., Ongena, J., Sartori, R., Stäbler, A., Rachlew, E., Tennfors, E., Tuccillo, A., Walden, A., Zastrow, K., and JET-EFDA Contributors

Published
2007

6. Fast wave current drive in JET ITB-plasma

Author

Hellsten, T., Laxåback, M., Bergkvist, T., Johnson, T., Mantsinen, M., Matthews, G., Meo, F., Nguyen, F., Noterdaeme, J.-M., Petty, C.C., Tala, Tuomas, van Eester, D., Andrew, P., Beaumont, P., Bobkov, V., Brix, M., Brzozowski, J., Eriksson, L.G., Giroud, C., Joffrin, E., Kiptily, V., Mailloux, J., Mayoral, M.-L., Monakhov, I., Sartori, R., Staebler, A., Rachlew, E., Tennfors, E., Tuccillo, A., Walden, A., and Zastrow, K. D.

Subjects
Physics, Jet (fluid), Tokamak, Plasma, ITB, ICRH, Fast Wave Current Drive, law.invention, Bootstrap current, Dipole, law, Plasma diagnostics, Current (fluid), Atomic physics, Current density
Abstract

Fast wave current drive has been performed in JET plasmas with internal transport barriers, ITBs, and strongly reversed magnetic shear. Although the current drive efficiency of the power absorbed on the electrons is fairly high, only small effects are seen in the central current density. The main reasons are the parasitic absorption of RF power, the strongly inductive nature of the plasma and the interplay between the fast wave driven current and bootstrap current. The direct electron heating in the FWCD experiments is found to be strongly degraded compared to that with the dipole phasing.

Published
2005

7. On parasitic absorption in FWCD experiments in JET ITB plasmas

Author

Hellsten, T., Laxaback, M., Bergkvist, T., Johnson, T., Meo, F., Nguyen, F., Petty, C., Mantsinen, M., Matthews, G., Noterdaeme, J., Tala, T., Van Eester, D., Andrew, P., Beaumont, P., Bobkov, V., Brix, M., Brzozowski, J., Eriksson, L., Giroud, C., Joffrin, E., Kiptily, V., Mailloux, J., Mayoral, M., Monakhov, I., Sartori, R., Staebler, A., Rachlew, E., Tennfors, E., Tuccillo, A., Walden, A., Zastrow, K., and JET EFDA Contributors

Published
2005

10. On the parasitic absorption in FWCD experiments in JET ITB plasmas

Author

Hellsten, T, primary, Laxåback, M, additional, Bergkvist, T, additional, Johnson, T, additional, Meo, F, additional, Nguyen, F, additional, Petty, C.C, additional, Mantsinen, M, additional, Matthews, G, additional, Noterdaeme, J.-M, additional, Tala, T, additional, Eester, D. Van, additional, Andrew, P, additional, Beaumont, P, additional, Bobkov, V, additional, Brix, M, additional, Brzozowski, J, additional, Eriksson, L.-G, additional, Giroud, C, additional, Joffrin, E, additional, Kiptily, V, additional, Mailloux, J, additional, Mayoral, M.-L, additional, Monakhov, I, additional, Sartori, R, additional, Staebler, A, additional, Rachlew, E, additional, Tennfors, E, additional, Tuccillo, A, additional, Walden, A, additional, Zastrow, K.-D, additional, and Contributors, JET-EFDA, additional

Published
2005
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13. Anisotropy of ion temperature in a reversed-field-pinch plasma

Author

Sasaki, K, primary, Hörling, P, additional, Fall, T, additional, Brzozowski, J H, additional, Brunsell, P, additional, Hokin, S, additional, Tennfors, E, additional, Sallander, J, additional, Drake, J R, additional, Inoue, N, additional, Morikawa, J, additional, Ogawa, Y, additional, and Yoshida, Z, additional

Published
1997
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19. On the parasitic absorption in FWCD experiments in JET ITB plasmas

Author

Hellsten, T., Laxåback, M., Bergkvist, T., Johnson, T., Meo, F., Nguyen, F., Petty, C. C., Mantsinen, M., Matthews, G., Noterdaeme, J. -M, Tala, T., Eester, D., Andrew, P., Beaumont, P., Volodymyr Bobkov, Brix, M., Brzozowski, J., Eriksson, L. -G, Giroud, C., Joffrin, E., Kiptily, V., Mailloux, J., Mayoral, M. -L, Monakhov, I., Sartori, R., Staebler, A., Rachlew, E., Tennfors, E., Tuccillo, A., Walden, A., Zastrow, K. -D, Pick, R.M., Hidalgo, C., van Milligen, B.Ph., and Helfenstein, P.

Subjects
Physics::Plasma Physics
Abstract

Fast wave current drive, FWCD, has been performed in JET plasmas with internal transport barriers, ITBs. The heating during the FWCD is strongly degraded compared to dipole heating. The FWCD has only a small effect on the central current density. The main reasons are the parasitic absorption of RF power, the strongly inductive nature of the plasma and the interplay between the fast wave driven current and bootstrap current.

25. Observations of toroidicity-induced Alfven eigenmodes in a reversed field pinch plasma

Author

N. Vianello, E. Tennfors, Henric Bergsåker, V. Antoni, G. Regnoli, E. Martines, Roberto Cavazzana, M. Spolaore, Marco Cecconello, G. Serianni, Jenny-Ann Malmberg, Fulvio Zonca, Regnoli, G, Bergsaker, H, Tennfors, E, Zonca, F, Martines, E, Serianni, G, Spolaore, M, Vianello, N, Cecconello, M, Antoni, V, Cavazzana, R, and Malmberg, J

Subjects
Physics, Toroid, Tokamak, Reversed field pinch, Alfven eigenmode, Plasma, reversed field pinch, Condensed Matter Physics, Magnetic field, law.invention, Physics::Plasma Physics, Normal mode, law, RFP, Plasma diagnostics, Atomic physics, Excitation
Abstract

High frequency peaks in the spectra of magnetic field signals have been detected at the edge of Extrap-T2R [P. R. Brunsell, H. Bergsåker, M. Cecconello, J. R. Drake, R. M. Gravestijn, A. Hedqvist, and J.-A. Malmberg, Plasma Phys. Controlled Fusion, 43, 1457 (2001)]. The measured fluctuation is found to be mainly polarized along the toroidal direction, with high toroidal periodicity n and Alfv́nic scaling (f∝B mi ni). Calculations for a reversed field pinch plasma predict the existence of an edge resonant, high frequency, high- n number toroidicity-induced Alfv́n eigenmode with the observed frequency scaling. In addition, gas puffing experiments show that edge density fluctuations are responsible for the rapid changes of mode frequency. Finally a coupling with the electron drift turbulence is proposed as drive mechanism for the eigenmode. © 2005 American Institute of Physics.

Published
2005

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