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Thresholdless stochastic particle heating by a single wave.

F Sattin1, D F Escande1,2

  • 1Consorzio RFX (CNR, ENEA, INFN, Università di Padova, Acciaierie Venete SpA), Corso Stati Uniti 4, 35127 Padova, Italy.

Physical Review. E
|July 19, 2023
PubMed
Summary
This summary is machine-generated.

Stochastic heating of magnetized particles by electromagnetic waves can occur without a high amplitude threshold if spatial inhomogeneity is present. This thresholdless mechanism requires sufficient interaction time rather than high wave amplitude.

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Area of Science:

  • Plasma physics
  • Astrophysics
  • Particle acceleration

Background:

  • Stochastic heating energizes magnetized particles using low-frequency electromagnetic waves.
  • A threshold in wave amplitude restricts its applicability in homogeneous conditions.

Purpose of the Study:

  • To investigate the effect of spatial inhomogeneity on stochastic heating.
  • To determine if the amplitude threshold can be removed.

Main Methods:

  • Numerical simulations of particle dynamics.
  • Analysis of the particle Hamiltonian.

Main Results:

  • Weak spatial inhomogeneity completely removes the amplitude threshold for stochastic heating.
  • The threshold is replaced by a requirement on the interaction duration.

Conclusions:

  • Thresholdless stochastic heating is achievable in inhomogeneous systems.
  • This mechanism broadens the applicability of particle energization by waves.