LH-power Coupling in Advance Tokamak Plasmas in JET
Lower Hybrid Current Drive is the most efficient tool to generate non-inductive current in tokamak plasmas. In JET, significant modifications of the current profile have been recently achieved in coupling up to 3MW of LH power in optimized shear discharges. However, the improved particle confinement during optimized shear discharges. However, the improved particle confinement during optimized shear plasmas results in a sharp decrease of the electron density on front the launcher close or below the cut-off density and makes difficult coupling of the LH power. Deuterium gas near the launcher can help to improve the coupling, but has also the effect of increasing the ELM activity leading to the erosion of the internal transport barrier. Future development of lower hybrid launcher should include the constraints imposed by the scenario such as the optimized shear.
Bibliographic Reference: Report: JET-P(99)09, 10pp.
Availability: Available from the Librarian, JET Joint Undertaking, Abingdon (GB)
Record Number: 200011864 / Last updated on: 2000-03-21
Original language: en
Available languages: en