Evidence for Landau Damping of Tonks-Dattner Resonances

Virginia Commonwealth University

Robert J. Ragan, E.B. Wiita

T. Yukawa

José Tito Mendonça, Robin Kaiser, Hugo Terças +1 more

Using both fluid and kinetic descriptions, with repulsive forces between nearby atoms included, we discuss the basic oscillations and waves of a cloud of ultracold atoms confined in a magneto-optical trap. The existence of a hybrid mode, with properties similar to both plasma and acoustic waves, is described in detail. Tonks-Dattner resonances for confined hybrid modes in a spherical cloud are discussed, and the prediction of a nonlinear coupling between the dipole resonance and the hybrid modes is considered. Landau damping processes and quasilinear diffusion in velocity space are also discussed.

H. Held, L. Marmet, Georg A. Raithel +2 more

Tianxing Chen, Ronghua Lu, Li Shuai Guo +1 more

The collective plasma oscillations are investigated in ultracold neutral plasma with a non-uniform density profile. Instead of the plane configuration widely used, we derive the plasma oscillation equations with spherically symmetric distribution and Gaussian density profile. The damping of radial oscillation is found. The Tonks–Dattner resonances of the ultracold neutral plasma with an applied RF field are also calculated.