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Experimental Evidence of Intrinsic Current Generation by Turbulence in Stationary Tokamak Plasmas.
Phys Rev Lett
February 2022
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China.
High-β_{θe} (a ratio of the electron thermal pressure to the poloidal magnetic pressure) steady-state long-pulse plasmas with steep central electron temperature gradient are achieved in the Experimental Advanced Superconducting Tokamak. An intrinsic current is observed to be modulated by turbulence driven by the electron temperature gradient. This turbulent current is generated in the countercurrent direction and can reach a maximum ratio of 25% of the bootstrap current.
View Article and Find Full Text PDFRecent advances in high- experiments and magnetohydrodynamic instabilities with hybrid scenarios in the HL-2A Tokamak.
Fundam Res
September 2022
Joint Laboratory for Fusion Product and Energetic Particle, Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
Over the past several years, high- experiments have been carried out on HL-2A. The high- is realized using double transport barriers (DTBs) with hybrid scenarios. A stationary high- ( ) scenario was obtained by pure neutral-beam injection (NBI) heating.
View Article and Find Full Text PDFImpact of E × B shear flow on low-n MHD instabilities.
Phys Plasmas
May 2017
Fusion Simulation Center and State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China.
Recently, the stationary high confinement operations with improved pedestal conditions have been achieved in DIII-D [K. H. Burrell , Phys.
View Article and Find Full Text PDFGlobal plasma turbulence simulations of q = 3 sawtoothlike events in the RTP tokamak.
Phys Rev Lett
January 2005
FOM Institute for Plasma physics Rijnhuizen, Association EURATOM-FOM, Trilateral Euregio Cluster, P.O. Box 1207, 3430 BE Nieuwegein, The Netherlands.
A two-fluid computer model of electromagnetic tokamak turbulence, CUTIE, is used to study the dynamic structure and turbulent transport in the Rijnhuizen Tokamak Project tokamak. A discharge with dominant, off-axis electron cyclotron heating is the main focus of the simulations which were extended over several resistive diffusion times. CUTIE reproduces the turbulent transport and MHD phenomena of the experiment.
View Article and Find Full Text PDFModification of the current profile in high-performance plasmas using off-axis electron-cyclotron-current drive in DIII-D.
Phys Rev Lett
June 2003
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
Recent DIII-D experiments using off-axis electron cyclotron current drive (ECCD) have demonstrated the ability to modify the current profile in a plasma with toroidal beta near 3%. The resulting plasma simultaneously sustains the key elements required for Advanced Tokamak operation: high bootstrap current fraction, high beta, and good confinement. More than 85% of the plasma current is driven by noninductive means.
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