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Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
Published on: August 21, 2018
Selective excitation of low frequency drift waves by density modulation and parametric excitation of higher frequency
Subir Biswas1, Debjyoti Basu, Rabindranath Pal
1Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India.
Abstract:
Excitation of low frequency drift waves in a radial region of a weak density gradient is demonstrated experimentally by strong temporal modulation of the plasma density. Though a parallel electron current can destabilize drift waves throughout the region, we observe mode selection at the resonant location matching the frequency of modulation. Parametric mode-mode interaction among two excited drift modes to destabilize a higher frequency one is reported under the specific condition of the growth rate. Theoretically estimated growth rates fit well with the experiment.
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