FIZIKA A 10 (2001) 1 , 31-46

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ON THE PROBLEM OF SELF-FOCUSSING AND TRANSVERSAL
STABILITY IN A MAGNETISED PLASMA WITH STREAMING IONS

K. Kr. MONDALa, A. ROYCHOWDHURYb and S. N. PAULc

a Department of Physics, Raja Peary Mohan College, Pin-712 258, Hooghly, West Bengal, India
b Department of Physics, Jadavpur University, Calcutta-700 032, West Bengal, India
c Serampore Girls' College, Pin-712 201, Hooghly, West Bengal, India

Received 7 July 2000; revised manuscript received 15 March 2001
Accepted 19 March 2001

Self-focusing in a magnetized plasma consisting of cold electrons and ions has been studied in a situation when ions have a streaming velocity and the external magnetic field is at an angle with the streaming direction. By the use of a modified scaling, we have deduced an analogue of a non-linear Schrodinger equation involving only the space variables, which actually controls the transversal stability of the system, thus signaling the possibility of self-focusing. The various situations arising due to the variation of the propagation angle and the streaming velocity u0 are discussed in detail for the specific cases of D2 and N2 ions.
 

PACS numbers: 25.40.LW, 27.70.+q
UDC 539.172.4 
Keywords: magnetised plasma, cold electrons and ions, streaming velocity and external magnetic field at an angle, non-linear Schrodinger equation, self-focusing, D2 and N2 ions
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