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An Atmospheric Pressure Plasma Setup to Investigate the Reactive Species Formation
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Plasma Collision in a Gas Atmosphere.

S Le Pape1,2, L Divol1, G Huser3

  • 1Lawrence Livermore National Laboratory, Livermore, California 94550, USA.

Physical Review Letters
|February 1, 2020
PubMed
Summary
This summary is machine-generated.

Adding helium gas to colliding plasmas prevents mixing, controlling high-velocity plasma interactions. This study demonstrates gas atmospheres can transition plasma collisions from interpenetrating to hydrodynamic regimes.

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Area of Science:

  • Plasma Physics
  • High-Energy-Density Physics
  • Laser-Plasma Interactions

Background:

  • Collisions between counterpropagating plasmas are fundamental to astrophysical phenomena and inertial confinement fusion.
  • Understanding plasma mixing and energy transfer is crucial for controlling these interactions.
  • Previous studies lacked methods to control the regime of plasma collisions.

Purpose of the Study:

  • To investigate the effect of a gas atmosphere on the collision dynamics of counterpropagating gold and carbon plasmas.
  • To determine if a gas medium can alter the interaction regime from interpenetrating to hydrodynamic.
  • To quantify the changes in plasma parameters like Mach number and ion-ion mean free path.

Main Methods:

  • Utilizing the Omega laser facility to create colliding gold and carbon plasmas.
  • Employing imaging optical Thomson scattering to diagnose plasma properties.
  • Conducting experiments with and without an ambient helium gas atmosphere.

Main Results:

  • Without helium, significant large-scale mixing of gold and carbon ions was observed.
  • In the presence of helium, the two plasmas remained largely separated.
  • Ionic temperature changes indicated a reduction in the maximum Mach number from M=7 to M=4.
  • The counterstreaming ion-ion mean free path was reduced by approximately a factor of 10.

Conclusions:

  • A low-density ambient gas atmosphere effectively controls high-velocity counterstreaming plasma collisions.
  • The addition of helium transitions the collision regime from interpenetrating to one described by hydrodynamics.
  • This control mechanism offers a new pathway for managing plasma interactions in various scientific applications.