Advances in lower hybrid current drive technology on Alcator C-Mod
نویسندگان
چکیده
منابع مشابه
Mode conversion current drive experiments on Alcator C-Mod
In tokamak plasmas with multiple ion species, fast magnetosonic waves (FW) in the Ion Cyclotron Range of Frequency can mode convert to shorter wavelength modes at the Ion-Ion hybrid layer, leading to localized electron heating and current drive. Due to k‖ upshifts associated with the poloidal magnetic field, only small net driven currents were predicted from mode converted Ion Bernstein Waves (...
متن کاملInvestigation of lower hybrid physics through power modulation experiments on Alcator C-Mod
Lower hybrid current drive (LHCD) is an attractive tool for off-axis current profile control in magneticly confined tokamak plasmas and burning plasmas (ITER), because of its high current drive efficiency. The LHCD system on Alcator C-Mod operates at 4.6 GHz, with ∼ 1 MW of coupled power, and can produce a wide range of launched parallel refractive index (n ||) spectra. A 32 chord, perpendicula...
متن کاملModification of H-mode pedestal structure with lower hybrid waves on Alcator C Mod
The application of lower hybrid waves (LH) in H-mode plasmas on Alcator C-Mod can result in significant reduction of core particle inventory, with no significant degradation of energy confinement. This phenomenon has been observed in steady enhanced Dα (EDA) H-mode targets, which are sustained by ion cyclotron RF auxiliary heating, in which pedestal density nped is usually tied firmly to plasma...
متن کاملMeasurement of fast electron transport by lower hybrid modulation experiments in Alcator C-Mod
The Lower Hybrid Current Drive (LHCD) system on Alcator C-Mod can produce spectra with a wide range of peak parallel refractive index (n||). An experiment in which LH power is square-wave modulated on a time scale much faster than the current relaxation time does not significantly alter the poloidal magnetic field inside the plasma and thus allows for realistic modeling and consistent plasma co...
متن کاملNeutrals studies on Alcator C-Mod
The high neutral densities and short neutral mean free paths in the Alcator C-Mod divertor have provided a unique testing ground for our understanding of the role of neutrals in a tokamak. The high neutral pressures found in the C-Mod divertor can only be reproduced in models by including such collisional processes as ion-neutral and neutral-neutral collisions, neutral viscosity, as well as tak...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nuclear Fusion
سال: 2013
ISSN: 0029-5515,1741-4326
DOI: 10.1088/0029-5515/53/7/073012