Collisional damping rates for electron plasma waves reassessed

Banks, Jeffrey W.; Brunner, S.; Berger, R. L.; Arrighi, William; Tran, T. M.

doi:10.1103/physreve.96.043208

Cited by 7 publications

(16 citation statements)

References 27 publications

(38 reference statements)

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“…The dependence of the least-damped solution of (3.4) is shown in figure 1, where both its damping rate and frequency are seen to be monotonic functions of , which is in agreement with previous EPW studies (Banks et al. 2017). In the following, without loss of generality and similarly to previous studies of collisional damping of EPW (Banks et al.…”

Section: Collisionless Dispersion Relationsupporting

confidence: 89%

“…In the following, without loss of generality and similarly to previous studies of collisional damping of EPW (Banks et al. 2016, 2017), we select the value of when fixed studies are performed, which corresponds to . While this value of is typical for EPW driven by stimulated Raman scattering (Brunner & Valeo 2004; Winjum et al.…”

Section: Collisionless Dispersion Relationmentioning

confidence: 99%

“…1996), and can even be the only source of significant damping of EPW in low-temperature laboratory plasmas (Banks et al. 2017).…”

Section: Introductionmentioning

confidence: 99%

“…The role of self-collisions in the linear regime was investigated in Banks et al. (2017) using a simplified operator with respect to the full Coulomb operator and in Brantov et al. (2012) where a simplified form for the high-order moments of the like-species Coulomb collision operator was employed in order to derive an analytic dispersion relation.…”

Section: Introductionmentioning

confidence: 99%

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Linear theory of electron-plasma waves at arbitrary collisionality

et al. 2019

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The dynamics of electron-plasma waves are described at arbitrary collisionality by considering the full Coulomb collision operator. The description is based on a Hermite-Laguerre decomposition of the velocity dependence of the electron distribution function. The damping rate, frequency, and eigenmode spectrum of electron-plasma waves are found as functions of the collision frequency and wavelength. A comparison is made between the collisionless Landau damping limit, the Lenard-Bernstein and Dougherty collision operators, and the electron-ion collision operator, finding large deviations in the damping rates and eigenmode spectra. A purely damped entropy mode, characteristic of a plasma where pitch-angle scattering effects are dominant with respect to collisionless effects, is shown to emerge numerically, and its dispersion relation is analytically derived. It is shown that such a mode is absent when simplified collision operators are used, and that like-particle collisions strongly influence the damping rate of the entropy mode. †

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Section: Collisionless Dispersion Relationsupporting

confidence: 89%

Section: Collisionless Dispersion Relationmentioning

confidence: 99%

“…1996), and can even be the only source of significant damping of EPW in low-temperature laboratory plasmas (Banks et al. 2017).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Linear theory of electron-plasma waves at arbitrary collisionality

et al. 2019

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“…The 1D-1V VPFP equation set solved here has been applied in research on laser-plasma interactions in the context of inertial fusion (Banks, Brunner, Berger, & Tran, 2016;Fahlen, Winjum, Grismayer, & Mori, 2009), plasma-based accelerators (Thomas, 2016), space physics (Chen et al, 2019), and fundamental plasma physics (Heninger & Morrison, 2018;Pezzi, Valentini, & Veltri, 2016). While there are VPFP software libraries which are available in academic settings, research laboratories, and industry (Banks, Brunner, Berger, Arrighi, & Tran, 2017;Joglekar et al, 2018), the community has yet to benefit from a simple-to-read, open-source Python implementation. This lack of capability is currently echoed in conversations within the PlasmaPy (PlasmaPy Community et al, 2018) community (PlasmaPy is a collection of open-source plasma physics resources).…”

Section: Statement Of Needmentioning

confidence: 99%

VlaPy: A Python package for Eulerian Vlasov-Poisson-Fokker-Planck Simulations

Joglekar¹,

Levy²

2020

JOSS

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Characteristics of collisional damping of surface ion-acoustic mode in Divertor Plasma Simulator-2 (DiPS-2)

et al. 2021

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The dissipation of ion-acoustic surface waves propagating in a semi-bounded and collisional plasma which has a boundary with vacuum is theoretically investigated and this result is used for the analysis of edge-relevant plasma simulated by Divertor Plasma Simulator-2 (DiPS-2). The collisional damping of the surface wave is investigated for weakly ionized plasmas by comparing the collisionless Landau damping with the collisional damping as follows: (1) the ratio of ion temperature $({T_i})$ to electron temperature $({T_e})$ should be very small for the weak collisionality $({T_i}/{T_e} \ll 1)$ ; (2) the effect of collisionless Landau damping is dominant for the small parallel wavenumber, and the decay constant is given as $\gamma \approx{-} \sqrt {\mathrm{\pi }/2} {k_\parallel }{\lambda _{De}}\omega _{pi}^2/{\omega _{pe}}$ ; and (3) the collisional damping dominates for the large parallel wavenumber, and the decay constant is given as $\gamma \approx{-} {\nu _{in}}/16$ , where ${\nu _{in}}$ is the ion–neutral collisional frequency. An experimental simulation of the above theoretical prediction has been done in the argon plasma of DiPS-2, which has the following parameters: plasma density ${n_e} = (\textrm{2--9)} \times \textrm{1}{\textrm{0}^{11}}\;\textrm{c}{\textrm{m}^{ - 3}}$ , ${T_e} = 3.7- 3.8\;\textrm{eV}$ , ${T_i} = 0.2- 0.3\;\textrm{eV}$ and collision frequency ${\nu _{in}} = 23- 127\;\textrm{kHz}$ . Although the wavelength should be specified with the given parameters of DiPS-2, the collisional damping is found to be $\gamma = ( - 0.9\;\textrm{to}\; - 5) \times {10^4}\;\textrm{rad}\;{\textrm{s}^{ - 1}}$ for ${k_\parallel }{\lambda _{De}} = 10$ , while the Landau damping is found to be $\gamma = ( - 4\;\textrm{to}\; - 9) \times {10^4}\;\textrm{rad}\;{\textrm{s}^{ - 1}}$ for ${k_\parallel }{\lambda _{De}} = 0.1$ .

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Collisional damping rates for electron plasma waves reassessed

Cited by 7 publications

References 27 publications

Linear theory of electron-plasma waves at arbitrary collisionality

Linear theory of electron-plasma waves at arbitrary collisionality

VlaPy: A Python package for Eulerian Vlasov-Poisson-Fokker-Planck Simulations

Characteristics of collisional damping of surface ion-acoustic mode in Divertor Plasma Simulator-2 (DiPS-2)

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