Ion sound wave excitation in a plasma under a Langmuir turbulence regime |
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Institution: | 1. Department of Physics, The University of Azad Jammu and Kashmir, Muzaffarabad 13100, Azad Kashmir, Pakistan;2. National Center for Physics at QAU Campus, Shahdra Valley Road, Islamabad 44000, Pakistan |
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Abstract: | Ion sound wave excitation in a warm non-relativistic (Wb ≤ 400 eV) electron beam unmagnetized plasma system is studied experimentally. The spectrum of these waves shows two peaks at frequencies of 70 and 230 kHz respectively. The origin of these waves is connected with modulational instability and cavity collapse. We show that the energy of bulk accelerated electrons can explain the measured value of krDe for high-frequency sound waves. The energy of ion sound waves is not high enough to have an influence on the Langmuir turbulence dynamics. |
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