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Electrostatic Ion-cyclotron Wave Excitation by a Gyrating Ion Beam in a Magnetized Plasma Containing Heavy Positive Ions

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Title Electrostatic Ion-cyclotron Wave Excitation by a Gyrating Ion Beam in a Magnetized Plasma Containing Heavy Positive Ions
 
Creator Yadav, Meena
Sharma, Jyotsna
 
Subject Growth rate
Unstable frequency
Cerenkov interaction
Beam energy
 
Description 671-677
In the present paper, we have developed a theoretical model of cylindrical magnetized plasma column consisting of
electrons, 􀜭􀬾 ions & heavy positive 􀜤􀜽􀬾 ion species. A gyrating ion beam of potassium having radius ~1.5 cm and energy
10eV is launched through one end of the cylinder parallel to the static magnetic field and the electrostatic ion cyclotron
wave is assumed to propagate nearly perpendicular to the magnetic field. The presence of heavy positive 􀜤􀜽􀬾 ions in the
collisionless magnetized plasma decreases the critical drift for the excitation of EIC waves and hence the injected beam
drives the electrostatic ion cyclotron (EIC) waves to instability through Cerenkov interaction. Therefore, the plasma is
observed to contains two excited EIC wave modes; a (light positive) 􀜭􀬾 ion mode and a (heavy positive) 􀜤􀜽􀬾ion mode. The
frequencies and growth rates for both the positive unstable modes are worked out using fluid theory for the typical existing
experimental parameters which are found to increase with the increase in ion beam energy and beam density. It is also
observed that the unstable wave frequency and growth rate for both the modes increases with the increase in relative ion
concentration of 􀜭􀬾and heavy 􀜤􀜽􀬾 positive ions respectively. Magnetic field is also one of the important factors which
influence the plasma instabilities appreciably. As the magnetic field increases, the frequency of both the ion modes increases
linearly.
 
Date 2021-10-20T09:39:32Z
2021-10-20T09:39:32Z
2021-10
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://nopr.niscair.res.in/handle/123456789/58315
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source IJPAP Vol.59(10) [October 2021]