What question did this study set out to answer?

To investigate nonlinear interactions among low toroidal mode number (n = 1–4) instabilities and determine their impact on plasma confinement in PBX-M discharges.

October 1, 1994Nuclear FusionOpen Access

Nonlinear coupling of low n modes in PBX-M

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Authors

SŠS. ŠesnićUniversity of Split RKR. KaitaRutgers, The State University of New Jersey SKS. KayePrinceton Plasma Physics Laboratory

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Implication

Experimental analysis reveals nonlinear three-wave mode coupling in PBX-M tokamak discharges, indicating that multi-mode interactions trigger rational surface perturbations and degrade plasma...

Key Points

To investigate nonlinear interactions among low toroidal mode number (n = 1–4) instabilities and determine their impact on plasma confinement in PBX-M discharges.
Analyzed low, medium, and high beta discharges in the PBX-M tokamak to observe the simultaneous emergence of low toroidal mode (n = 1–4) perturbations.
Tracked spectral characteristics, including frequency (ω) and wavenumber (k) sideband generation and harmonic mode interactions.
Evaluated confinement degradation by measuring changes in total neutron production rates and medium-energy ion losses during mode coupling events.
Simultaneous fundamental modes and their harmonics interacted nonlinearly, generating three-wave coupling sidebands (kω₂ ± lω₁ and kk₂ ± lk₁) on rational surfaces.
Nonlinear coupling created multiple modes sharing identical toroidal and poloidal numbers (m, n) but possessing different phase velocities.
Three-wave interactions directly deteriorated confinement across discharges, producing marked drops in neutron emission rates and elevated losses of medium-energy ions.

Cite This Study

Šesnić et al. (1994) studied this question.

synapsesocial.com/papers/6a836e421ef8dc9331166e56 https://doi.org/10.1088/0029-5515/34/10/i06

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Implication

Experimental analysis reveals nonlinear three-wave mode coupling in PBX-M tokamak discharges, indicating that multi-mode interactions trigger rational surface perturbations and degrade plasma...

Nonlinear coupling of low n modes in PBX-M

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Cite This Study

Nonlinear coupling of low n modes in PBX-M

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Implication

Key Points

Cite This Study

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