Abstract
Magnetic fluctuations have been studied during Reversed Field Pinch operation in the Extrap T1-Upgrade device using external poloidal and toroidal arrays of edge coils. Statistical techniques have been adopted to determine the spatial structure of the edge fluctuating field. For frequencies below 200 kHz a global mode structure is found with poloidal mode numbers m=0 and 1 and negligible power for modes with m{>=}2. Fluctuation activity with higher frequencies appears to be of a turbulent nature with a scale length shorter than the coil separation length. The derived toroidal mode power spectrum is peaked around mode number /n/=12 to 22. This peak corresponds to helical m=1 modes resonant on the q-profile inside the reversal surface. Comparatively low power is found in n>0 external kink modes. (au).
Citation Formats
Mazur, S, Nordlund, P, and Drake, J R.
Magnetic field fluctuations during RFP operation in Extrap T1-Upgrade.
Sweden: N. p.,
1992.
Web.
Mazur, S, Nordlund, P, & Drake, J R.
Magnetic field fluctuations during RFP operation in Extrap T1-Upgrade.
Sweden.
Mazur, S, Nordlund, P, and Drake, J R.
1992.
"Magnetic field fluctuations during RFP operation in Extrap T1-Upgrade."
Sweden.
@misc{etde_10135739,
title = {Magnetic field fluctuations during RFP operation in Extrap T1-Upgrade}
author = {Mazur, S, Nordlund, P, and Drake, J R}
abstractNote = {Magnetic fluctuations have been studied during Reversed Field Pinch operation in the Extrap T1-Upgrade device using external poloidal and toroidal arrays of edge coils. Statistical techniques have been adopted to determine the spatial structure of the edge fluctuating field. For frequencies below 200 kHz a global mode structure is found with poloidal mode numbers m=0 and 1 and negligible power for modes with m{>=}2. Fluctuation activity with higher frequencies appears to be of a turbulent nature with a scale length shorter than the coil separation length. The derived toroidal mode power spectrum is peaked around mode number /n/=12 to 22. This peak corresponds to helical m=1 modes resonant on the q-profile inside the reversal surface. Comparatively low power is found in n>0 external kink modes. (au).}
place = {Sweden}
year = {1992}
month = {Oct}
}
title = {Magnetic field fluctuations during RFP operation in Extrap T1-Upgrade}
author = {Mazur, S, Nordlund, P, and Drake, J R}
abstractNote = {Magnetic fluctuations have been studied during Reversed Field Pinch operation in the Extrap T1-Upgrade device using external poloidal and toroidal arrays of edge coils. Statistical techniques have been adopted to determine the spatial structure of the edge fluctuating field. For frequencies below 200 kHz a global mode structure is found with poloidal mode numbers m=0 and 1 and negligible power for modes with m{>=}2. Fluctuation activity with higher frequencies appears to be of a turbulent nature with a scale length shorter than the coil separation length. The derived toroidal mode power spectrum is peaked around mode number /n/=12 to 22. This peak corresponds to helical m=1 modes resonant on the q-profile inside the reversal surface. Comparatively low power is found in n>0 external kink modes. (au).}
place = {Sweden}
year = {1992}
month = {Oct}
}