Presentation is loading. Please wait.

Presentation is loading. Please wait.

Confining instabilities in a complex plasma S. V. Vladimirov, A. A

Published byIrma Solberg Modified over 6 years ago

Similar presentations

Presentation on theme: "Confining instabilities in a complex plasma S. V. Vladimirov, A. A"— Presentation transcript:

1 Confining instabilities in a complex plasma S. V. Vladimirov, A. A
Confining instabilities in a complex plasma S.V. Vladimirov, A.A. Samarian, J. Albreht, B.W. James, S.A. Maiorov, N.F. Cramer Stability of the vertical and horizontal confinement of colloidal dust particles levitating in a plasma appears as an interplay of the external confining forces as well as the interparticle interactions and plasma collective processes.

2 Theory: Levitation and dynamics one particle
One particle: levitation One particle: oscillatory motion Vertical and horizontal oscillations in the external potentials

3 Levitation and dynamics of two particles
Two particles: various arrangements Two particles: various types of motions Horizontal and vertical oscillations (inter-particle interactions: Debye potential and wake potential) Planar-two-rotation

4 Simulation: Wake potential of one particle
MD simulations The ion focus The plasma potential

5 Simulation: Ion focusing by two particles
The normalized ion density for three different separations D between two dust grains. The distances are in Lx = 4.1lDe

6 Simulation: Ion focusing by two particles
Change of the ion focus with the changing distance

7 Simulation: Plasma potential of two particles
The plasma potential of two particles The distances are in Lx = 4.1lDe. The potential well (region B) is formed behind the dust grain and starts to form between the grains when the separation exceeds the electron Debye length.

8 Simulation: Plasma potential of two particles
Change of the potential with the changing distance

9 Simulation: Charges of two particles in the ion flow

10 Theory: Balance of forces in the horizontal and vertical directions
Force balance in the horizontal direction Force balance in the vertical direction (no wake) Force balance in the vertical direction (with wake)

11 Theory: Oscillations of particles aligned horizontally
Horizontal oscillations in phase Horizontal oscillations counter phase

12 Theory: Oscillations of particles aligned horizontally
Vertical oscillations in phase Vertical oscillations counter phase

13 Theory: Oscillations of particles aligned vertically
Vertical oscillations in phase Vertical oscillations counter phase

14 Theory: Oscillations of particles aligned vertically
Horizontal oscillations in phase Horizontal oscillations counter phase

15 Theory: Stability diagram for the levitation

16 Experiment: Levitation of two particles
Voltage applied to the ring electrode 0 V -3 V -6 V -9 V -6 V -3 V 0 V

17 Experiment: Various types of two particles behavior
Low pressure: small oscillations Medium pressure & power: oscillations in phase High pressure & power: orbital motion

18 Experiment: Dependence of parameters g on the experimental conditions

19 Experiment: oscillations of three particles
Small random oscillations String orbits on a conical surface String orbits on a biconical surface Rim orbital motion

20 Experiment: Oscillations of three particles
Pressure: 36mTorr RF discharge of 300mV at 15 MHz Middle particle oscillates with highest amplitude Angular frequency in the order of 1Hz Particles rotate on biconical surface

21 Experiment: Orbital motions of three particles
Pressure: 23.8mTorr RF discharge of 520mV at 15 MHz Rim orbital motion Angular frequency less than 1Hz

22 Experiment: Interparticle distances for three particles
RF discharge voltage: 180 mV RF discharge voltage: 160 mV RF discharge voltage: 140 mV RF discharge voltage: 120 mV RF discharge voltage: 100 mV RF discharge voltage: 80 mV

Download ppt "Confining instabilities in a complex plasma S. V. Vladimirov, A. A"

Similar presentations

Empirical Rule for Phase Transitions in Dusty Plasma Crystals A.A. Samarian School of Physics, University of Sydney, Sydney, NSW 2006, Australia.

Empirical Rule for Phase Transitions in Dusty Plasma Crystals A.A. Samarian School of Physics, University of Sydney, Sydney, NSW 2006, Australia.
A. Samarian, W. Tsang, J. Khachan, B. James Complex Plasma Laboratory School of Physics, University of Sydney, NSW 2006, Australia.

A. Samarian, W. Tsang, J. Khachan, B. James Complex Plasma Laboratory School of Physics, University of Sydney, NSW 2006, Australia.
New, „Flexible“ Plasma Devices for Complex Plasma Experiments

New, „Flexible“ Plasma Devices for Complex Plasma Experiments
Electron-Electron Interactions

Electron-Electron Interactions
Particle’s Dynamics in Dusty Plasma with Gradients of Dust Charges

Particle’s Dynamics in Dusty Plasma with Gradients of Dust Charges
Alex.A. Samarian and Brian.W. James School of Physics, University of Sydney, NSW 2006, Australia Sheath edge location The charge of dust particles in sheath.

Alex.A. Samarian and Brian.W. James School of Physics, University of Sydney, NSW 2006, Australia Sheath edge location The charge of dust particles in sheath.
Flinders University of South Australia Leon Mitchell Nathan Prior University of Sydney Brian James Alex Samarian Felix Cheung.

Flinders University of South Australia Leon Mitchell Nathan Prior University of Sydney Brian James Alex Samarian Felix Cheung.
1 ILC Bunch compressor Damping ring ILC Summer School August 24 2007 Eun-San Kim KNU.

1 ILC Bunch compressor Damping ring ILC Summer School August Eun-San Kim KNU.
Effect of supra thermal electrons on particle charge in RF sheath A.A.Samarian and S.V. Vladimirov School of Physics, University of Sydney, NSW 2006, Australia.

Effect of supra thermal electrons on particle charge in RF sheath A.A.Samarian and S.V. Vladimirov School of Physics, University of Sydney, NSW 2006, Australia.
A. Samarian, O. Vaulina, W. Tsang, B. James School of Physics, University of Sydney, NSW 2006, Australia.

A. Samarian, O. Vaulina, W. Tsang, B. James School of Physics, University of Sydney, NSW 2006, Australia.
TEST GRAINS AS A NOVEL DIAGNOSTIC TOOL B.W. James, A.A. Samarian and W. Tsang School of Physics, University of Sydney NSW 2006, Australia

TEST GRAINS AS A NOVEL DIAGNOSTIC TOOL B.W. James, A.A. Samarian and W. Tsang School of Physics, University of Sydney NSW 2006, Australia
Phonons in a 2D Yukawa triangular lattice: linear and nonlinear experiments Dept. of Physics and Astronomy, University of Iowa supported by DOE, NASA,

Phonons in a 2D Yukawa triangular lattice: linear and nonlinear experiments Dept. of Physics and Astronomy, University of Iowa supported by DOE, NASA,
F. Cheung, A. Samarian, B. James School of Physics, University of Sydney, NSW 2006, Australia.

F. Cheung, A. Samarian, B. James School of Physics, University of Sydney, NSW 2006, Australia.
Effect of working pressure and gas flow rate on RF discharge Discharge gas: Argon; Forwarded RF power: 750 W; Substrate biased voltage: -200 V.

Effect of working pressure and gas flow rate on RF discharge Discharge gas: Argon; Forwarded RF power: 750 W; Substrate biased voltage: -200 V.
Measurement of the Charge of a Particle in a Dusty Plasma Jerome Fung, Swarthmore College July 30, 2004.

Measurement of the Charge of a Particle in a Dusty Plasma Jerome Fung, Swarthmore College July 30, 2004.
THE WAFER- FOCUS RING GAP*

THE WAFER- FOCUS RING GAP*
STREAMER DYNAMICS IN A MEDIA CONTAINING DUST PARTICLES* Natalia Yu. Babaeva and Mark J. Kushner Iowa State University Department of Electrical and Computer.

STREAMER DYNAMICS IN A MEDIA CONTAINING DUST PARTICLES* Natalia Yu. Babaeva and Mark J. Kushner Iowa State University Department of Electrical and Computer.
Plasma Kinetics around a Dust Grain in an Ion Flow N F Cramer and S V Vladimirov, School of Physics, University of Sydney, S A Maiorov, General Physics.

Plasma Kinetics around a Dust Grain in an Ion Flow N F Cramer and S V Vladimirov, School of Physics, University of Sydney, S A Maiorov, General Physics.
O.Vaulina, A.Samarian, O.Petrov, B.James, V.Fortov School of Physics, University of Sydney, Australia Institute for High Energy Densities, Moscow, Russia.

O.Vaulina, A.Samarian, O.Petrov, B.James, V.Fortov School of Physics, University of Sydney, Australia Institute for High Energy Densities, Moscow, Russia.
F. Cheung, A. Samarian, W. Tsang, B. James School of Physics, University of Sydney, NSW 2006, Australia.

F. Cheung, A. Samarian, W. Tsang, B. James School of Physics, University of Sydney, NSW 2006, Australia.

Similar presentations

Ads by Google