Estimation of plasma density perturbation from dusty plasma injection by laser irradiation on tungsten target in DiPS

Kang, In Je; Bae, Min-Keun; Park, In Sun; Lee, Min Ji; Chung, Ki-Seok

doi:10.1088/2058-6272/ab568c

Cited by 4 publications

(2 citation statements)

References 36 publications

(47 reference statements)

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“…In a series of recent experiments with a LaB 6 direct current plasma source and argon plasmas, the plasma parameters under normal operation conditions were obtained as follows: , , and (Kang et al. 2017, 2020). The theory discussed in § 2 deals with the simplest problem of surface waves travelling along the boundary of plasma with sharp inhomogeneity.…”

Section: Application To Divertor Simulatormentioning

confidence: 99%

“…Recently, DiPS has been upgraded and experimental simulation with LaB 6 cathode plasma source was conducted to obtain the following parameters for argon plasma: plasma density , , and working neutral pressure (Kang et al. 2020). Applicability of collisional and collisionless damping mechanisms would be addressed by utilizing the approximate analytic solutions.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Application To Divertor Simulatormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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Simulations of fusion edge plasmas by linear plasma devices: physics and plasma–material interactions

Kang

Bae

Park

et al. 2022

J. Korean Phys. Soc.

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Measurement of laser induced fluorescence for argon plasma flow with oxygen injection

et al. 2023

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The experimental investigation of the effects of O2 injection on the magnetized Ar plasma flow in the linear plasma device was conducted by using the measurement of laser induced fluorescence (LIF) with electric probes. The LIF measurement was based on the Ar ion transition from the 3d4F7/2 metastable level to the 4p4D5/2 level at a wavelength of 668.61 nm. In addition, the analysis of ion velocity distribution functions (IVDFs) involved the detection of fluorescence light emitted from the 4p4D5/2 level to the 4s4P3/2 level, which had a wavelength of 442.72 nm. For a comprehensive analysis of the intricate interaction between O2 injection and the behavior of the Ar plasma flow, the oxygen was injected into the Ar plasma, and the O2/Ar ratio ranged from 0% to 14% while maintaining a constant pressure of 2 mTorr. The Zeeman splitting in the IVDFs was clearly observable for pure Ar plasma due to 800 G as the high magnetic field strength. The split form disappeared due to a small amount of oxygen injected as the O2/Ar ratio of 3.5%. The LIF intensity is in agreement with the tendency of plasma density due to the reduction of Ar ions by charge transfer, quenching, and neutralization as O2 is injected into the Ar plasma. The experimental results show that the effects on temperature and flow velocity for the Ar ions are insignificant when O2 is injected into the Ar plasma at the O2/Ar ratio of 0%–14%, in contrast to the large change in the electron temperature.

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Estimation of plasma density perturbation from dusty plasma injection by laser irradiation on tungsten target in DiPS

Cited by 4 publications

References 36 publications

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

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

Simulations of fusion edge plasmas by linear plasma devices: physics and plasma–material interactions

Measurement of laser induced fluorescence for argon plasma flow with oxygen injection

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