Lower-hybrid current drive with opposing ohmic drive on PLT

Technical Report · Wed Jun 01 04:00:00 EDT 1983

DOI:https://doi.org/10.2172/6029563· OSTI ID:6029563

Stevens, J; von Goeler, S; Bernabei, S; Chu, T K; Hooke, W; Jobes, F; Meservey, E; Motley, R

Two distinct conditions where the rf phase velocity is directed opposite to the ohmically induced electron drift have been studied experimentally: (1) rf current ramp-up (f/sub p/ > 0), where an induced electric field opposes the current increase; (2) rf current ramp-down, where waves are launched opposite the electron drift direction for a decaying plasma current. The time behavior of the electron tail is inferred from hard x-ray (30 to 750 keV) emission as a function of angle to B. In cases (1) and (2) we find that the emission amplitude in the reverse (opposite the LH phase velocity) direction increases throughout the rf pulse, while it is constant in the forward direction. This increase indicates that some high energy electrons are accelerated or are even running away in the direction opposite to the main rf produced tail. It also indicates for case (1) that the electric field in the plasma center has been reversed by the rf current drive.

• Research Organization: Princeton Univ., NJ (USA). Plasma Physics Lab.
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 6029563
• Report Number(s): PPPL-2018; ON: DE83014914
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
CURRENT-DRIVE HEATING
ELECTRIC FIELDS
ELECTRIC HEATING
ELECTRON DRIFT
HEATING
HIGH-FREQUENCY HEATING
JOULE HEATING
LOWER HYBRID HEATING
PLASMA HEATING
PLT DEVICES
RESISTANCE HEATING
SPECTRA
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
X-RAY SPECTRA