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| Paper IPM / Physic / 6643 |
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| Abstract: | |||||||
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Penetration of high frequency (HF) electromagnetic field into a
semibounded plasma at the presence of trapped particles is considered.
It is shown that the trapping of particles by the HF field considerably
changes the condition for its propagation. In the stationary case, with
increasing the HF field amplitude at the boundary, the frequency above
which the plasma is transparent continually decreases. But the trapping of
particles, was found to give, a lower limit for this critical frequency,
i.e., this lower limit goes to zero when there is no trapping continually
as the incident field amplitude increases, meanwhile the length of
penetration increases and approaches a finite limit in contrast to the
untrapped case where it increases monotonically. Moreover, when the HF field
amplitude at the boundary exceeds some critical value, the plasma will
become transparent and the localized structure of the HF field will
change to an oscillatory.
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