New fluctuation phenomena in the H-mode regime of PDX tokamak plasmas

Technical Report · Tue May 01 04:00:00 EDT 1984

DOI:https://doi.org/10.2172/7045454· OSTI ID:7045454

Slusher, R E; Surko, C M; Valley, J F; Crowley, T; Mazzucato, E; McGuire, K

A new kind of quasi-coherent fluctuation is observed near the edge of plasmas in the PDX tokamak during H-mode operation. (The H-mode occurs in neutral beam heated divertor plasmas and is characterized by improved energy containment as well as large density and temperature gradients near the plasma edge.) These fluctuations are evidenced as VUV and density fluctuation bursts at well-defined frequencies (..delta omega../..omega.. less than or equal to 0.1) in the frequency range between 50 and 180 kHz. They affect the edge temperature-density product, and therefore they may be important for understanding the relationship between the large edge density and temperature gradients and the improved energy confinement.

• Research Organization: Princeton Univ., NJ (USA). Plasma Physics Lab.; Bell Labs., Murray Hill, NJ (USA)
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 7045454
• Report Number(s): PPPL-2110; ON: DE84013684
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700108* -- Fusion Energy-- Plasma Research-- Wave Phenomena
BEAM INJECTION
BOUNDARY LAYERS
CLOSED PLASMA DEVICES
CONFINEMENT
DIVERTORS
ELECTROMAGNETIC RADIATION
FAR INFRARED RADIATION
INFRARED RADIATION
LAYERS
NEUTRAL ATOM BEAM INJECTION
PDX DEVICES
PLASMA CONFINEMENT
PLASMA DENSITY
PLASMA DRIFT
PLASMA SHEATH
PLASMA WAVES
RADIATIONS
TEMPERATURE GRADIENTS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES