Effect of magnetic field on laser-blow-off plasma plume: Structured temporal emission profile

Kumar, Ajai; Joshi, H. C.; Prahlad, V.; Singh, Rajesh

doi:10.1016/j.physleta.2010.04.029

Cited by 17 publications

(7 citation statements)

References 25 publications

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“…Many research groups have investigated the interaction of magnetic field with expanding plasma and observed some interesting phenomena, such as ion acceleration/ deceleration, spectral emission intensity enhancement, electron density and temperature increase, plasma plume splitting, instability and oscillating behavior and so on [13][14][15][16]. Ajai Kumar et al [17][18][19][20] investigated the effect of magnetic field on the lithium plasma plume emission. Enhancement in the emission intensity and different structures of plasma plume in the presence of magnetic field have been observed.…”

Section: Introductionmentioning

confidence: 99%

Laser-induced breakdown spectroscopy to monitor ion cyclotron range of frequency wall cleaning Li/D co-deposition in EAST tokamak

Liu

Sun

et al. 2017

Fusion Engineering and Design

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In this paper, laser-induced breakdown spectroscopy (LIBS) under magnetic field condition has been studied in laboratory and EAST tokamak. The experimental results reveal that in helium ambient gas, the magnetic field significantly enhances the LIBS signal intensity (~ 3 times). The effect of time delay and laser fluence on the intensity of LIBS has been investigated for optimizing the signal to background ratio (S/B). The developed LIBS approach has been applied to monitor the cleaning performance of the first wall in the fusion device of EAST using the ion cyclotron range of frequency (ICRF). The experimental results demonstrate that the cleaning performance for Li/D co-deposition layer is effective under helium ambient gas. The removing rate of Li on the surface of W tile is faster than that on Mo tile in He-ICRF cleaning and the D/(D+H) ratio on Mo tile is higher by ~ 1.2 times than that on W tile. This work would indicate the feasibility of using LIBS to monitor the wall cleaning processes in EAST tokamak.

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Section: Introductionmentioning

confidence: 99%

Laser-induced breakdown spectroscopy to monitor ion cyclotron range of frequency wall cleaning Li/D co-deposition in EAST tokamak

Liu

Sun

et al. 2017

Fusion Engineering and Design

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“…The presence of magnetic field may initiate several phenomena in the overall plume dynamics, e.g., confinement, plume compression, adiabatic heating, and onset of instabilities, etc. (Peyser et al, 1992;Kim et al, 2007;Neogi & Thareja, 1999;Harilal et al, 2005;Qindeel et al, 2008;Rafique et al, 2008;Shen et al, 2006;Haverkcamp et al, 2009;Kumar et al, 2010aKumar et al, , 2010b.…”

Section: Introductionmentioning

confidence: 99%

Image analysis of expanding laser-produced lithium plasma plume in variable transverse magnetic field

et al. 2011

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Using fast imaging technique, the effect of transverse magnetic field on the shape and dynamics of the lithium plasma plume has been studied. Enhancement in the overall emission intensity as well as appearance of distinct structures (lobes) in the plasma plume in the presence of magnetic field has been observed. By introducing a variable magnetic field, the influence of J × B force in expanding plasma plume across the transverse magnetic field has been explored. It appears that J × B force does not has a substantial role in the observed structures in the present case rather different atomic processes, which get affected due to change in plasma parameters, are responsible for appearance of these structures.

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“…Na soldagem, o sopro magnético pode causar principalmente a deposição irregular do cordão de solda e a falta de fusão em uma de suas extremidades [10,11,12]. No corte a plasma, a ocorrência deste sopro pode gerar o corte assimétrico e a formação de respingos e rebarbas nas superfícies cortadas [13,14]. Se os parâmetros de corte já atuam na formação e tamanho da ZAC, a presença de sopro magnético pode aumentar esta região de variação microestrutural para o lado em que o jato de plasma for desviado.…”

Section: (B) (A)unclassified

Efeito Do Sopro Magnético Na Qualidade Do Corte a Plasma Automatizado

Mougo¹,

Campos²,

Arydes³

2019

ABM Proceedings

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Resumo O desenvolvimento de tecnologias para o corte de materiais é avaliado pela qualidade do produto final. Deste modo, diz-se que um processo de corte apresenta bons resultados se este não modifica as formas e dimensões da peça e mantem suas propriedades mecânicas inalteradas. Dentre os processos de corte, o corte a plasma em chapas metálicas apresenta relevância para diversas aplicações da indústria. Sua precisão e qualidade dependem principalmente da boa execução da trajetória de corte e de sua respectiva velocidade. Neste trabalho utiliza-se um mecanismo que realiza o controle automático da ferramenta de corte e verifica-se a ocorrência do sopro magnético através da formação de rebarbas e da dureza para diferentes velocidades e alturas de corte. Os resultados demonstram os parâmetros e ajustes para cortes mais preciso, sem necessidade de acabamento ou tratamento da superfície após o corte.

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Effect of magnetic field on laser-blow-off plasma plume: Structured temporal emission profile

Cited by 17 publications

References 25 publications

Laser-induced breakdown spectroscopy to monitor ion cyclotron range of frequency wall cleaning Li/D co-deposition in EAST tokamak

Laser-induced breakdown spectroscopy to monitor ion cyclotron range of frequency wall cleaning Li/D co-deposition in EAST tokamak

Image analysis of expanding laser-produced lithium plasma plume in variable transverse magnetic field

Efeito Do Sopro Magnético Na Qualidade Do Corte a Plasma Automatizado

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