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Title: Double-crossing mode conversion in nonuniform media

Abstract

A new type of mode conversion between two linear waves in a nonuniform medium is investigated. Single-crossing conversion occurs when a ray of one wave crosses {ital transversely} the dispersion manifold of another wave. {ital Double-crossing} mode conversion theory describes when the ray punctures the dispersion manifold twice due to ray {ital curvature}. To study this new process, a one dimensionally nonuniform background medium is considered, which gives rise to four scenarios. These scenarios are distinguished on the basis of whether the two waves have equal or opposite energy signs, and whether they are copropagating or counterpropagating. Using {ital modular}-eikonal theory (suitable for multiple crossings), each scenario is first studied analytically by constructing an S-matrix relation between the {ital outgoing} and {ital incoming} asymptotic wave amplitudes. The analytical results are then compared with numerical results and excellent agreement is found. {copyright} {ital 1998 American Institute of Physics.}

Authors:
; ;  [1];  [2]
  1. Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  2. Department of Physics, College of William and Mary, Williamsburg, Virginia 23185 (United States)
Publication Date:
OSTI Identifier:
565758
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 5; Journal Issue: 1; Other Information: PBD: Jan 1998
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; WAVE PROPAGATION; DISPERSION RELATIONS; PLASMA WAVES; OSCILLATION MODES; PLASMA INSTABILITY

Citation Formats

Brizard, A J, Morehead, J J, Kaufman, A N, and Tracy, E R. Double-crossing mode conversion in nonuniform media. United States: N. p., 1998. Web. doi:10.1063/1.872674.
Brizard, A J, Morehead, J J, Kaufman, A N, & Tracy, E R. Double-crossing mode conversion in nonuniform media. United States. https://doi.org/10.1063/1.872674
Brizard, A J, Morehead, J J, Kaufman, A N, and Tracy, E R. 1998. "Double-crossing mode conversion in nonuniform media". United States. https://doi.org/10.1063/1.872674.
@article{osti_565758,
title = {Double-crossing mode conversion in nonuniform media},
author = {Brizard, A J and Morehead, J J and Kaufman, A N and Tracy, E R},
abstractNote = {A new type of mode conversion between two linear waves in a nonuniform medium is investigated. Single-crossing conversion occurs when a ray of one wave crosses {ital transversely} the dispersion manifold of another wave. {ital Double-crossing} mode conversion theory describes when the ray punctures the dispersion manifold twice due to ray {ital curvature}. To study this new process, a one dimensionally nonuniform background medium is considered, which gives rise to four scenarios. These scenarios are distinguished on the basis of whether the two waves have equal or opposite energy signs, and whether they are copropagating or counterpropagating. Using {ital modular}-eikonal theory (suitable for multiple crossings), each scenario is first studied analytically by constructing an S-matrix relation between the {ital outgoing} and {ital incoming} asymptotic wave amplitudes. The analytical results are then compared with numerical results and excellent agreement is found. {copyright} {ital 1998 American Institute of Physics.}},
doi = {10.1063/1.872674},
url = {https://www.osti.gov/biblio/565758}, journal = {Physics of Plasmas},
number = 1,
volume = 5,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1998},
month = {Thu Jan 01 00:00:00 EST 1998}
}