Electron acceleration by Langmuir turbulence Peter H. Yoon U. Maryland, College Park.

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Presentation transcript:

Electron acceleration by Langmuir turbulence Peter H. Yoon U. Maryland, College Park

Outline Laboratory Beam-Plasma Experiments Beam-plasma instability & Langmuir turbulence Solar wind electrons Conclusions

LABORATORY BEAM-PLASMA EXPERIMENTS Part 1.

Alexeff et al., Hot-electron plasma by beam- plasma interaction, PRL, 10, 273 (1963). 5 keV DC electron beam interacting with plasma yields 250 keV X ray photons.

Tarumov et al., Investigation of a hydrogen plasma with “hot” electrons, Sov. Phys. JETP, 25, 31 (1967).

During the discharge phase the hot electron component was 1/10, which increased to 1/3 in the decay phase.

Levitskii and Shashurin, Spatial development of plasma-beam instability, Sov. Phys. JETP, 25, 227 (1967).

Whelan and Stenzel, Electromagnetic radiation and nonlinear energy flow in an electron beam-plasma system, Phys. Fluids, 28, 958 (1985).

Outline Laboratory Beam-Plasma Experiments Beam-plasma instability & Langmuir turbulence Solar wind electrons Conclusions

BEAM-PLASMA INSTABILITY AND LANGMUIR TURBULENCE Part 2.

Bump-in-tail instability Langmuir Turbulence generated by beam-plasma interaction

Langmuir oscillation Ion-sound wave

t x E(x,t)E(x,t)

t x E(x,t)E(x,t) Langmuir wave

1D approxiation Ions (protons) are taken as a quasi-steady state, and the electrons are made of two components, one background Gaussian distribution, and a tenuous beam component.

Backgroun d (thermal) electrons Beam electrons

T Umeda, private communications

Bump-in-tail instability

Beam-plasma or bump-in-tail instability

Bump-on-tail instability A.A. Vedenov, E. P. Velikhov, R. Z. Sagdeev, Nucl. Fusion 1, 82 (1961). W. E. Drummond and D. Pines, Nucl. Fusion Suppl. 3, 1049 (1962).

Bump-in-tail instability

Weak turbulence theory L. M. Gorbunov, V. V. Pustovalov, and V. P. Silin, Sov. Phys. JETP 20, 967 (1965) L. M. Al’tshul’ and V. I. Karpman, Sov Phys. JETP 20, 1043 (1965) L. M. Kovrizhnykh, Sov. Phys. JETP 21, 744 (1965) B. B. Kadomtsev, Plasma Turbulence (Academic Press, 1965) V. N. Tsytovich, Sov. Phys. USPEKHI 9, 805 (1967) V. N. Tsytovich, Nonlinear Effects in Plasma (Plenum Press, 1970) V. N. Tsytovich, Theory of Turbulent Plasma (Consultants Bureau, 1977) A. G. Sitenko, Fluctuations and Non-Linear Wave Interactions in Plasmas (Pergamon, 1982)

Backscattered L wave

~ g = 1/(n D 3 ) Discrete-particle (collisional) effect

Weak turbulence theory

P. H. Yoon, T. Rhee, and C.-M. Ryu, Self-consistent generation of superthermal electrons by beam-plasma interaction, PRL 95, (2005). Long-time behavior of bump-on-tail Langmuir instability

Outline Laboratory Beam-Plasma Experiments Beam-plasma instability & Langmuir turbulence Solar wind electrons Conclusions

SOLAR WIND ELECTRONS Part 3.

STEREO spacecraft

WIND spacecraft

2007 January 9 Linghua Wang, Robert P. Lin, Chadi Salem

By Linghua Wang, Davin Larsen, Robert Lin fe(v)fe(v) Electron Velocity Distribution

Outline Laboratory Beam-Plasma Experiments Beam-plasma instability & Langmuir turbulence Solar wind electrons Conclusions

CONCLUSIONS Part 4.

Beam-plasma interaction is a fundamental problem in plasma physics. Laboratory experiment shows electrons accelerated by beam-plasma interaction. Electron beam-excited Langmuir turbulence theory adequately explains the laboratory results and predict the formation of energetic tail distribution. Solar wind electrons feature energetic tail population confirming Langmuir turbulence acceleration theory.