Measurement of electron density and electron temperature of a cascaded arc plasma using laser Thomson scattering compared to an optical emission spectroscopic approach

Wang, Yong; Liu, Cong; Shi, Jinjing; Wu, Xinming; Ding, Hongbin

doi:10.1088/2058-6272/aa861d

Cited by 20 publications

(14 citation statements)

References 32 publications

(44 reference statements)

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“…There is a software specially designed to automatically process the complex LTS spectra distorted by TGS and to determine T e and n e in real time. This LTS system has been employed successfully for cascaded arc plasma [46,47], nanosecond pulse discharge plasma [48], and RF plasma (Figure 8 shows the experimental setup) [49]. The employment of LTS system to precisely measure the temperature of helicon plasma is also possible, exciting, and expected in the ongoing work.…”

Section: Introductionmentioning

confidence: 99%

First Helicon Plasma Physics and Applications Workshop

2022

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The First Helicon Plasma Physics and Applications Workshop was held on September 23−24, 2021, through Zoom Cloud Meeting, instead of in an on-site gathering, due to the COVID-19 pandemic. It was convened by Rod Boswell (IOC) and Guangnan Luo (LOC), and organised by Lei Chang’s group. The workshop attracted 110 registrations and ∼100 online audiences from ∼30 affiliations. There were 33 presentations covering the various fundamental physics of helicon plasma and its applications to space electric propulsion, material processing, and magnetic confinement fusion. This paper highlights the presentations, discussions, and perspectives given in the workshop, serving as reference for the helicon community.

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Section: Introductionmentioning

confidence: 99%

First Helicon Plasma Physics and Applications Workshop

2022

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“…Due to the capacity to produce high density plasma, cascaded arc plasma sources are selected to simulate the divertor plasma stream. Plasma-wall interactions (PWI) experiments with high particle flux have been performed in cascaded arc source type linear plasma devices such as Magnum-PSI [4], Pilot-PSI [5], CIMPLE-PSI [6], SCU-PSI [7], and DUT-PSI [8]. It has been demonstrated that the achievement of large ion flux requires both high magnetic field and huge gas fueling rate (typically several to tens of standard liters per minute (SLM)).…”

Section: Introductionmentioning

confidence: 99%

Particle flux characteristics of a compact high-field cascaded arc plasma device

Yuan¹,

Zhou²,

Liu³

et al. 2021

Plasma Sci. Technol.

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A new compact cascaded arc device for plasma-wall interaction study is developed at the Institute of Plasma Physics, Chinese Academy of Sciences. A magnetic field up to 0.8 T is achieved to confine plasmas in a 1.2 m long and 0.1 m diameter vacuum chamber. Gas fluid type analysis in this compact vacuum system was done under high particle flux condition. The gas pressure obtained by calculation was consistent with the measurement result. Continuous argon plasma discharge with ion flux of ∼0.5×10 24 m −2 s −1 is successfully sustained for more than 1 h. The effects of magnetic field configuration, gas flow rate, and discharge arc current on the ion flux to target were studied in detail.

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“…Wang et al studied the electron temperature and electron density of the cascade arc plasma by combining TS and spectrometry. They found that the excited electron temperature obtained by spectrometry was about 40% higher than that obtained by TS, a serious discrepancy if used to characterize non-local thermodynamic equilibrium plasma [14]. In recent years, TS has been successfully used to diagnose LPP, and a series of reliable results have been obtained.…”

Section: Introductionmentioning

confidence: 99%

Influence of heating effect in Thomson scattering diagnosis of laser-produced plasmas in air

Cao

et al. 2020

Plasma Sci. Technol.

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A state diagnosis of laser-produced plasma in air generated by a 1064 nm pulse laser was investigated by the Thomson scattering (TS) method. The evolutions of the electron temperature and electron density were obtained as a function of the time delay which ranged from 300-3200 ns. The heating effect produced by the 532 nm probe beam with different energies on the air plasma at different interaction times was further studied using a time-resolved optical emission spectroscopy technique. The influence of the probe beam on the electron density was found to be negligible, whereas its influence on electron temperature is evident. In addition, the heating effect of the probe beam on the plasma strongly depends on the energy of the probe beam, and gradually weakens with increasing time delay. Our results are helpful for further understanding the TS method and its application in plasma diagnostics.

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Measurement of electron density and electron temperature of a cascaded arc plasma using laser Thomson scattering compared to an optical emission spectroscopic approach

Cited by 20 publications

References 32 publications

First Helicon Plasma Physics and Applications Workshop

First Helicon Plasma Physics and Applications Workshop

Particle flux characteristics of a compact high-field cascaded arc plasma device

Influence of heating effect in Thomson scattering diagnosis of laser-produced plasmas in air

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