Rayleigh--Taylor instability on the pusher--fuel contact surface of stagnating targets

Journal Article · Thu Nov 01 04:00:00 EST 1990 · Physics of Fluids B; (USA)

DOI:https://doi.org/10.1063/1.859395· OSTI ID:6055626

Sakagami, H ^[1]; Nishihara, K ^[2]

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1. Institute for Supercomputing Research, Recruit Co. Ltd., 1-13-1 Kachidoki Chuo-Ku, Tokyo, 104 (Japan)
2. Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka Suita, Osaka, 565 (Japan)

Nonlinear evolution of the Rayleigh--Taylor instability on the pusher--fuel contact surface in the deceleration phase of implosion is investigated in cylindrical geometry using a two-dimensional fluid code, IMPACT-2D (J. Comput. Phys. {bold 49}, 357 (1983)). The linear growth rates obtained by simulations agree quite well with analytical values that include the cylindrical geometry effects. The saturation amplitudes of the exponential growth are found to be of the order of half the wavelength. The free-falling phase following the saturation is studied in detail. The perturbation amplitudes at the maximum compression are estimated as a function of an initial amplitude and its mode number. The reduction of the growth rate caused by electron thermal conduction is also investigated and a large reduction is observed for wavelengths shorter than ten times the electron mean-free path.

• OSTI ID: 6055626
• Journal Information: Physics of Fluids B; (USA), Journal Name: Physics of Fluids B; (USA) Vol. 2:11; ISSN 0899-8221; ISSN PFBPE
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107* -- Fusion Energy-- Plasma Research-- Instabilities
ACCELERATION
AMPLITUDES
COMPRESSION
COMPUTER CODES
CONFIGURATION
CORRELATIONS
CYLINDRICAL CONFIGURATION
ENERGY TRANSFER
FUELS
HEAT TRANSFER
IMPLOSIONS
INSTABILITY
INSTABILITY GROWTH RATES
MEAN FREE PATH
NONLINEAR PROBLEMS
NUMERICAL SOLUTION
RAYLEIGH-TAYLOR INSTABILITY
SATURATION
SIMULATION
STAGNATION
TARGETS
THERMAL CONDUCTION
TWO-DIMENSIONAL CALCULATIONS