Oblique interactions of dust density waves

Journal Article · Fri Jan 01 04:00:00 EST 2010

OSTI ID:984855

Wang, Zhelchui ^[1]; Li, Yang - Fang ^[2]; Hou, Lujing ^[2]; Jiang, Ke ^[2]; Wu, De - Jin ^[3]; Thomas, Hubertus M ^[2]; Morfill, Gregor E ^[2]

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1. Los Alamos National Laboratory
2. MAX-PLANCK INSTITUTE
3. CHINA

Self-excited dust density waves (DDWs) are studied in a striped electrode device. In addition to the usual perpendicularly (with respect to the electrode) propagating DDWs, which have been frequently observed in dusty plasma experiments on the ground, a low-frequency oblique mode is also observed. This low-frequency oblique DDW has a frequency much lower than the dust plasma frequency and its spontaneous excitation is observed even with a very low dust density. It is found that the low-frequency oblique mode can exist either separately or together with the usual perpendicular mode. In the latter case, a new mode arises as a result of the interactions between the perpendicular and the oblique modes. The experiments show that these three modes satisfy the wave coupling conditions in both the frequencies and the wave-vectors.

• Research Organization: Los Alamos National Laboratory (LANL)
• Sponsoring Organization: DOE
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 984855
• Report Number(s): LA-UR-10-00461; LA-UR-10-461
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DUSTS
ELECTRODES
EXCITATION
LANGMUIR FREQUENCY
PLASMA