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Title: Nonlinear coupling of low-n modes in PBX-M

Abstract

In many of the medium and high beta discharges in PBX-M low-n modes with different n-numbers are observed. The probability of a low-n mode to be excited decreases with increasing n-number. If two modes of different frequency and n-number ({omega}{sub 1} and {omega}{sub 2}; k{sub 1} and k{sub 2}) are simultaneously present in the plasma, these modes interact nonlinearly and create sidebands in frequency ({omega}{sub 2}{+-}{omega}{sub 1}) and wave-number (k{sub 2}{+-}k{sub 1} or n{sub 2}{+-}n{sub 1} and m{sub 2}{+-}m{sub 1}). If these fundamental modes, {omega}{sub 1}/k{sub 1} and {omega}{sub 2}/k{sub 2}, contain strong harmonics, the harmonics also interact nonlinearly, creating more nonlinear products: k{omega}{sub 2}{+-}l{omega}{sub 1} and kk{sub 2}{+-}lk{sub 1}, where k and l are integers describing the harmonics. These modes, the products of nonlinear interaction between two fundamental modes, most probably have a kink character. During this three-wave coupling interaction, a decrease in neutron rate and an enhanced loss of medium energy ions are observed.

Authors:
; ; ; ; ; ; ;  [1];  [2];  [3];  [4]; ;  [5]
  1. Princeton Plasma Physics Lab., NJ (United States)
  2. Princeton Univ., NJ (United States). Plasma Physics Lab.|[Grumman Aerospace Corp., Bethpage, NY (United States)
  3. Princeton Univ., NJ (United States). Plasma Physics Lab.|[ARACOR, Sunnyvale, CA (United States)
  4. Princeton Univ., NJ (United States). Plasma Physics Lab.|[Fusion Physics & Technology, Torrance, CA (United States)
  5. Univ. of Texas, Austin, TX (United States). Dept. of Electrical and Computer Engineering
Publication Date:
Research Org.:
Princeton Univ., NJ (United States). Plasma Physics Lab.
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10141649
Report Number(s):
PPPL-2959
ON: DE94009825; TRN: 94:008532
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Mar 1994
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; PBX DEVICES; PARTICLE LOSSES; OSCILLATION MODES; NONLINEAR PROBLEMS; COUPLING; 700340; PLASMA WAVES, OSCILLATIONS, AND INSTABILITIES

Citation Formats

Sesnic, S., Kaita, R., Kaye, S., Okabayashi, M., Bell, R.E., Kugel, H.W., Leblanc, B., Takahashi, H., Gammel, G.M., Holland, A., Levinton, F.M., Powers, E.J., and Im, S. Nonlinear coupling of low-n modes in PBX-M. United States: N. p., 1994. Web. doi:10.2172/10141649.
Sesnic, S., Kaita, R., Kaye, S., Okabayashi, M., Bell, R.E., Kugel, H.W., Leblanc, B., Takahashi, H., Gammel, G.M., Holland, A., Levinton, F.M., Powers, E.J., & Im, S. Nonlinear coupling of low-n modes in PBX-M. United States. doi:10.2172/10141649.
Sesnic, S., Kaita, R., Kaye, S., Okabayashi, M., Bell, R.E., Kugel, H.W., Leblanc, B., Takahashi, H., Gammel, G.M., Holland, A., Levinton, F.M., Powers, E.J., and Im, S. Tue . "Nonlinear coupling of low-n modes in PBX-M". United States. doi:10.2172/10141649. https://www.osti.gov/servlets/purl/10141649.
@article{osti_10141649,
title = {Nonlinear coupling of low-n modes in PBX-M},
author = {Sesnic, S. and Kaita, R. and Kaye, S. and Okabayashi, M. and Bell, R.E. and Kugel, H.W. and Leblanc, B. and Takahashi, H. and Gammel, G.M. and Holland, A. and Levinton, F.M. and Powers, E.J. and Im, S.},
abstractNote = {In many of the medium and high beta discharges in PBX-M low-n modes with different n-numbers are observed. The probability of a low-n mode to be excited decreases with increasing n-number. If two modes of different frequency and n-number ({omega}{sub 1} and {omega}{sub 2}; k{sub 1} and k{sub 2}) are simultaneously present in the plasma, these modes interact nonlinearly and create sidebands in frequency ({omega}{sub 2}{+-}{omega}{sub 1}) and wave-number (k{sub 2}{+-}k{sub 1} or n{sub 2}{+-}n{sub 1} and m{sub 2}{+-}m{sub 1}). If these fundamental modes, {omega}{sub 1}/k{sub 1} and {omega}{sub 2}/k{sub 2}, contain strong harmonics, the harmonics also interact nonlinearly, creating more nonlinear products: k{omega}{sub 2}{+-}l{omega}{sub 1} and kk{sub 2}{+-}lk{sub 1}, where k and l are integers describing the harmonics. These modes, the products of nonlinear interaction between two fundamental modes, most probably have a kink character. During this three-wave coupling interaction, a decrease in neutron rate and an enhanced loss of medium energy ions are observed.},
doi = {10.2172/10141649},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {3}
}