Resonant Particle Heating of an Electron Plasma by Oscillating Sheaths

Cluggish, B. P.; Danielson, J. R.; Driscoll, C. F.

doi:10.1103/physrevlett.81.353

Cited by 25 publications

(19 citation statements)

References 16 publications

(26 reference statements)

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“…In this case the plasma length and T oscillate in phase with the voltage, resulting in heating as collisions transfer energy between the parallel and perpendicular degrees of freedom. The adiabatic heating rate is (Cluggish et al, 1998) …”

Section: Controlled Heatingmentioning

confidence: 99%

Plasma and trap-based techniques for science with positrons

Danielson¹,

Dubin²,

Greaves³

et al. 2015

Rev. Mod. Phys.

227

222

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In recent years, there has been a wealth of new science involving low-energy antimatter (i.e., positrons and antiprotons) at energies ranging from 10 2 to less than 10 −3 eV. Much of this progress has been driven by the development of new plasma-based techniques to accumulate, manipulate and deliver antiparticles for specific applications. This article focuses on the advances made in this area using positrons. However many of the resulting techniques are relevant to antiprotons as well. An overview is presented of relevant theory of single-component plasmas in electromagnetic traps. Methods are described to produce intense sources of positrons and to efficiently slow the typically energetic particles thus produced. Techniques are described to trap positrons efficiently and to cool and compress the resulting positron gases and plasmas. Finally, the procedures developed to deliver tailored pulses and beams (e.g., in intense, short bursts, or as quasi-monoenergetic continuous beams) for specific applications are reviewed. The status of development in specific application areas is also reviewed. One example is the formation of antihydrogen atoms for fundamental physics [e.g., tests of invariance under charge conjugation, parity inversion and time reversal (the CPT theorem), and studies of the interaction of gravity with antimatter]. Other applications discussed include atomic and materials physics studies and study of the electron-positron many-body system, including both classical electron-positron plasmas and the complementary quantum system in the form of Bose-condensed gases of positronium atoms. Areas of future promise are also discussed. The review concludes with a brief summary and a list of outstanding challenges.

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Section: Controlled Heatingmentioning

confidence: 99%

Plasma and trap-based techniques for science with positrons

Danielson¹,

Dubin²,

Greaves³

et al. 2015

Rev. Mod. Phys.

227

222

View full text Add to dashboard Cite

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“…6 In the earth magnetosphere, particles can be trapped by mirror fields and perform mirror oscillations near the minimum of the magnetic field, so bounce resonant wave-particle interactions must be included when calculating wave damping. 7 Temporal harmonics due to particles bounce resonance has been observed previously through resonant particle heating in non-neutral plasmas 8 and low pressure inductive plasmas. 9 Here, we present damping measurements of axisymmetric Trivelpiece-Gould plasma modes in pure ion and pure electron plasmas with enhanced mode damping from a controlled azimuthally symmetric squeeze potential.…”

Section: Introductionmentioning

confidence: 76%

“…In general, / m;n may be nonzero for any m and n, so bounce harmonic Landau damping may occur for all n > 0 in Eq. (8). However, for a wave with odd m z and a squeeze that is symmetric about the center of the trap, / m;n is nonzero only for m and n odd.…”

Section: Bounce-harmonics Landau Damping Of Trivelpiece-gould Wavesmentioning

confidence: 97%

Bounce harmonic Landau damping of plasma waves

et al. 2016

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We present measurements of bounce harmonic Landau damping due to z-variations in the plasma potential, created by an azimuthally symmetric "squeeze" voltage V s applied to the cylindrical wall. Traditional Landau damping on spatially uniform plasma is weak in regimes where the wave phase velocity v ph x=k is large compared to the thermal velocity. However, z-variations in plasma density and potential create higher spatial harmonics, which enable resonant wave damping by particles with bounce-averaged velocities v ph =n, where n is an integer. In our geometry, the applied squeeze predominantly generates a resonance at v ph =3. Wave-coherent laser induced fluorescence measurements of particle velocities show a distinctive Landau damping signature at v ph =3, with amplitude proportional to the applied V s . The measured (small amplitude) wave damping is then proportional to V 2 s , in quantitative agreement with theory over a range of 20 in temperature. Significant questions remain regarding "background" bounce harmonic damping due to ubiquitous confinement fields and regarding the saturation of this damping at large wave amplitudes. Published by AIP Publishing. [http://dx

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“…In Ref. [66] it was shown that the heating rate increases by a factor of 10 4 as the oscillation frequency of the externally applied rf field is increased by a factor of 10 near the thermal electron bounce frequency.…”

Section: Self-consistent System Of Equations For a Kinetic Descrimentioning

confidence: 99%

Landau damping and anomalous skin effect in low-pressure gas discharges: Self-consistent treatment of collisionless heating

2004

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In low-pressure discharges, where the electron mean free path is larger or comparable with the discharge length, the electron dynamics is essentially nonlocal. Moreover, the electron energy distribution function (EEDF) deviates considerably from a Maxwellian. Therefore, an accurate kinetic description of the low-pressure discharges requires knowledge of the nonlocal conductivity operator and calculation of the non-Maxwellian EEDF. The previous treatments made use of simplifying assumptions: a uniform density profile and a Maxwellian EEDF. In the present study a self-consistent system of equations for the kinetic description of nonlocal, nonuniform, nearly collisionless plasmas of low-pressure discharges is reported. It consists of the nonlocal conductivity operator and the averaged kinetic equation for calculation of the non-Maxwellian EEDF. This system was applied to the calculation of collisionless heating in capacitively and inductively coupled plasmas. In particular, the importance of accounting for the nonuniform plasma density profile for computing the current density profile and the EEDF is demonstrated. The enhancement of collisionless heating due to the bounce resonance between the electron motion in the potential well and the external rf electric field is investigated. It is shown that a nonlinear and self-consistent treatment is necessary for the correct description of collisionless heating.

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Resonant Particle Heating of an Electron Plasma by Oscillating Sheaths

Cited by 25 publications

References 16 publications

Plasma and trap-based techniques for science with positrons

Plasma and trap-based techniques for science with positrons

Bounce harmonic Landau damping of plasma waves

Landau damping and anomalous skin effect in low-pressure gas discharges: Self-consistent treatment of collisionless heating

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