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Inverse Bremsstrahlung current drive.

Vadim R Munirov1, Nathaniel J Fisch1

  • 1Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA and Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08540, USA.

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Summary
This summary is machine-generated.

Bremsstrahlung absorption generates plasma electric currents. These currents are stronger than predicted because electrons gain momentum from ion recoil and asymmetric energy absorption.

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Area of Science:

  • Plasma Physics
  • Astrophysical Plasmas
  • Fusion Energy

Background:

  • Bremsstrahlung radiation is a key plasma process.
  • Understanding plasma current generation is crucial for fusion energy and astrophysics.
  • Previous models underestimated current generation from Bremsstrahlung absorption.

Purpose of the Study:

  • To investigate plasma current generation via Bremsstrahlung absorption.
  • To explain the enhanced electric current observed.
  • To refine theoretical models of plasma behavior under radiation.

Main Methods:

  • Theoretical analysis of Bremsstrahlung absorption in plasmas.
  • Consideration of electron momentum transfer during photon absorption.
  • Examination of asymmetric electromagnetic power deposition in electron velocity space.

Main Results:

  • Plasma electric current exceeds naive estimates.
  • Electron recoil momentum from ion Coulomb fields contributes to current enhancement.
  • Asymmetric absorption of electromagnetic power within the electron velocity distribution significantly boosts current.

Conclusions:

  • Bremsstrahlung absorption is a more potent driver of plasma currents than previously thought.
  • The study highlights the importance of electron-ion interactions and anisotropic energy deposition.
  • Findings have implications for understanding astrophysical phenomena and developing controlled fusion.