The criteria for occurrence and the dynamical features of electrostatic solitary waves in a homogeneous, unmagnetized ultradense plasma penetrated by a negative ion beam are investigated, relying on a quantum hydrodynamic model. The ionic components are modeled as inertial fluids, while the relativistic electrons obey Fermi-Dirac statistics. A new set of exact analytical conditions for localized solitary pulses to exist is obtained, in terms of plasma density. The algebraic analysis reveals that these depend sensitively on the negative ion beam characteristics, that is, the beam velocity and density. Particular attention is paid to the simultaneous occurrence of positive and negative potential pulses, identified by their respective distinct ambipolar electric field structure forms. It is shown that the coexistence of positive and negative potential pulses occurs in a certain interval of parameter values, where the ion beam inertia becomes significant.
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May 2018
Research Article|
May 25 2018
Coexistence of negative and positive polarity electrostatic solitary waves in ultradense relativistic negative-ion-beam permeated plasmas
I. S. Elkamash
;
I. S. Elkamash
a)
1
Centre for Plasma Physics, Queen's University Belfast
, Belfast BT7 1NN, Northern Ireland, United Kingdom
2
Physics Department, Faculty of Science, Mansoura University
, 35516 Mansoura, Egypt
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I. Kourakis
I. Kourakis
b)
1
Centre for Plasma Physics, Queen's University Belfast
, Belfast BT7 1NN, Northern Ireland, United Kingdom
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a)
Email: elkamashi@gmail.com
b)
Electronic mail: IoannisKourakisSci@gmail.com. URL: www.kourakis.eu
Phys. Plasmas 25, 052124 (2018)
Article history
Received:
February 01 2018
Accepted:
May 03 2018
Citation
I. S. Elkamash, I. Kourakis; Coexistence of negative and positive polarity electrostatic solitary waves in ultradense relativistic negative-ion-beam permeated plasmas. Phys. Plasmas 1 May 2018; 25 (5): 052124. https://doi.org/10.1063/1.5024519
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