Top Launch for Higher Off-axis Electron Cyclotron Current Drive Efficiency
نویسندگان
چکیده
منابع مشابه
Off-axis Electron Cyclotron Current Drive for Current Profile Control in Tokamaks*
Steady-state operation in a tokamak requires full noninductive support of the plasma current. Known methods of driving noninductive current are too inefficient to support more than a small fraction of the total plasma current. The route to a steady state tokamak lies through the Advanced Tokamak approach, for which improved confinement and stability support the plasma pressure at reduced plasma...
متن کاملElectron cyclotron current drive efficiency in an axisymmetric tokamak
The neoclassical transport theory is applied to calculate electron cyclotron current drive (ECCD) efficiency in an axisymmetric tokamak in the low-collisionality regime. The tokamak ordering is used to obtain a system of equations that describe the dynamics of the plasma where the nonlinear ponderomotive (PM) force due to high-power RF waves is included. The PM force is produced around an elect...
متن کاملDecrease in Trapping Effects for Off-axis Electron Cyclotron Drive in High Performance Plasmas
Increased efficiency of off-axis electron cyclotron current drive (ECCD) has been obtained in discharges in DIII–D with higher electron beta, and these results have been understood by studying computationally the particle fluxes in velocity space driven by the EC waves. The relativistic cyclotron resonance tends to shift away in velocity space from the trappedpassing boundary for low-field-side...
متن کاملElectron Cyclotron Current Drive and Suprathermal Electron Dynamics in the TCV Tokamak
Electron cyclotron current drive (ECCD) is an important prospective tool for tailoring the current profile in next-step devices. To fill the remaining gaps between ECCD theory and experiment, especially in the efficiency and localisation of current drive, a better understanding of the physics of suprathermal electrons appears necessary. On TCV, the fast electron population is diagnosed by a mul...
متن کاملCurrent Profile Modification with Electron Cyclotron Current Drive in the Diiiðd Tokamak*
Proof-of-principle experiments on the suitability of electron cyclotron current drive (ECCD) for active current profile control are reported. Experiments with second harmonic extraordinary mode absorption at power levels near 1 MW have demonstrated ability to modify the current profile. This modification is manifested in changes in the internal inductance and the time at which sawteeth appear. ...
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ژورنال
عنوان ژورنال: EPJ Web of Conferences
سال: 2019
ISSN: 2100-014X
DOI: 10.1051/epjconf/201920301004