Effects of the gas puffing neutral on the plasma parameters in the end-cell of GAMMA 10/PDX by using the multi-fluid code “LINDA”

Islam, Md. Shahinul; Nakashima, Y.; Takechi, Sayuri; Tatsumi, Ryoko; Hatayama, A.; Iijima, Takahiro; Yamashita, Soichiro; Yoshimoto, Tsubasa; Hara, Toshiki; Ezumi, N.; Sakamoto, M.

doi:10.1016/j.nme.2018.12.027

Cited by 10 publications

(6 citation statements)

References 19 publications

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“…Effects of pumping efficiency and radial transport coefficients were studied [20] and a quantitative analysis of the importance of transport and atomic processes, based on the two-point model [21,22], was performed. Alongside the efforts to adapt tokamak mean-field edge codes to LPDs, some attempts were also made to develop codes which implement plasma transport models in cylindrical geometry, both considering mean-field transport questions [23][24][25][26][27] and a consistent treatment of turbulence [28][29][30][31][32]. While this approach allows simplifications in the transport equations due to a simpler geometry, these codes are presently limited due to the absence or the highly simplified treatment of neutral species and their interactions with the background plasma.…”

Section: Introductionmentioning

confidence: 99%

Simulations of Argon plasmas in the linear plasma device GyM with the SOLPS-ITER code

Sala

Tonello

Uccello

et al. 2020

Plasma Phys. Control. Fusion

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Edge plasma codes, such as SOLPS, are widely used to study plasma transport in tokamaks scrape-off layers (SOL). The possibility to apply these codes to non hydrogenic plasmas and to linear plasma devices (LPDs) is gaining the interests of the fusion community. These facilities play a pivotal role in plasma-material interaction (PMI) studies for future fusion devices and may allow to test the code capabilities both in terms of geometry and simulated plasma species. In this contribution, we apply the SOLPS-ITER code for the simulations of Argon plasmas in the medium-flux linear machine GyM. A sensitivity scan over the pumping efficiency, transport coefficients and absorbed electron power was done, performing B2.5-EIRENE coupled simulations. A quantitative analysis of the different flux contributions is provided through the use of a twopoint modelling. Comparison with experiments shows a promising qualitative and quantitative agreement, with the sole exception of the simulated neutrals pressure. Dedicated EIRENE standalone simulations were performed to investigate this issue, also highlighting the role of neutral-neutral elastic collisions at high values of the puffing intensity.

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Section: Introductionmentioning

confidence: 99%

Simulations of Argon plasmas in the linear plasma device GyM with the SOLPS-ITER code

Sala

Tonello

Uccello

et al. 2020

Plasma Phys. Control. Fusion

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“…For the heat balance, ( 5) and ( 6) are combined to gain the total heat balance. Using the form in (12), the heat balance is written as:…”

Section: Global Particle Momentum and Power Balancementioning

confidence: 99%

“…The detailed modelling of processes involved in plasma detachment is rather limited in linear plasma devices. A recent modelling study using the LINDA code in GAMMA10/PDX [12] showed a reduction in electron temperature due to injection of H neutrals. However, processes involving hydrogen molecules such as molecular activated recombination (MAR) was not yet included.…”

Section: Introductionmentioning

confidence: 99%

B2.5-Eunomia simulations of Magnum-PSI detachment experiments: II. Collisional processes and their relevance

Chandra

Blank

Diomede

et al. 2021

Plasma Phys. Control. Fusion

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Detachment is achieved in Magnum-PSI by increasing the neutral background pressure in the target chamber using gas puﬃng. The plasma is studied using the B2.5 multi ﬂuid plasma code B2.5 coupled with Eunomia, a Monte Carlo solver for neutral species. This study focuses on the eﬀect of increasing neutral background pressure to the plasma volumetric loss of particle, momentum and energy. The plasma particle and energy loss almost linearly scale with the increase of neutral background pressure, while the momentum loss does not scale as strongly. Plasma recombination processes include molecular activated recombination (MAR), dissociative attachment, and atomic recombination. Atomic recombination, which includes radiative and three-body recombination, is the most relevant plasma process in reducing the particle ﬂux and, consequently, the heat ﬂux to the target. The low temperature where atomic recombination becomes dominant is achieved by plasma cooling via elastic H+-H2 collisions. The transport of vibrationally excited H2 molecules out of the plasma serves as an additional electron cooling channel with relatively small contribution. Additionally, the transport of highly vibrational H2 has a signiﬁcant impact in reducing the eﬀective MAR and dissociative attachment collision rates and should be considered properly. The relevancy of MAR and atomic recombination occupy separate electron temperature regimes, respectively, at Te = 1.5 eV and Te = 0.3 eV, with dissociative attachment being relevant in the intermediary. Plasma cooling via elastic H+-H2 collisions is eﬀective at Te ≤ 1 eV.

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“…Numerical simulation is performed at the end-cell of the device by using the LINDA. [12][13][14][15][16][17][18] In the previous studies, the neutral profile is calculated by solving a 1D continuity equation under the constant neutral velocity. [12][13][14][15][16][17][18] A Kinetic Monte-Carlo Neutral Code (KMNC) is newly developed and the transport of hydrogen neutral particles was investigated under the condition of fixed background plasma parameters in the previous study.…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14][15][16][17][18] In the previous studies, the neutral profile is calculated by solving a 1D continuity equation under the constant neutral velocity. [12][13][14][15][16][17][18] A Kinetic Monte-Carlo Neutral Code (KMNC) is newly developed and the transport of hydrogen neutral particles was investigated under the condition of fixed background plasma parameters in the previous study. [18] In this present calculation case, both the fluid and the neutral code are numerically solved in the self-consistence manner.…”

Section: Introductionmentioning

confidence: 99%

Impact of neutral gas puffing on the divertor power exhaust and particle control in GAMMA 10/PDX by the LINDA‐KNMC code

Islam

Nakashima

Hatayama

et al. 2021

Contributions to Plasma Physics

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This paper numerically investigates the impact of neutral gas puffing on the divertor power exhaust and particle control in GAMMA 10/PDX applying the plasma fluid code LINDA and the kinetic neutral code KMNC. The LINDA code is applied to GAMMA 10/PDX plasmas for understanding the physics of detachment and energy loss processes. The LINDA code is coupled with a Monte-Carlo neutral code for describing the hydrogen (H and H 2 ) neutral particles. The plasma ion temperature (T i ) is reduced towards the target plate with the increment of H 2 Gas-Puff rate. This paper also numerically investigates the impact of recombination processes on the detached formation. The ionization, charge-exchange, and recombination of H have been included as a particle and an energy sink and source parts of the fluid equations. The reaction rate coefficient of molecular activated recombination (MAR) has been recently introduced in the LINDA code. In this paper, we study numerically the effect of MAR on the detached plasma. The MAR plays a dominant role in making the detached plasma. The simulation clarified that H neutral particles injection can effectively generate the detached plasma by enhancing the plasma-neutral collisions processes.

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Effects of the gas puffing neutral on the plasma parameters in the end-cell of GAMMA 10/PDX by using the multi-fluid code “LINDA”

Cited by 10 publications

References 19 publications

Simulations of Argon plasmas in the linear plasma device GyM with the SOLPS-ITER code

Simulations of Argon plasmas in the linear plasma device GyM with the SOLPS-ITER code

B2.5-Eunomia simulations of Magnum-PSI detachment experiments: II. Collisional processes and their relevance

Impact of neutral gas puffing on the divertor power exhaust and particle control in GAMMA 10/PDX by the LINDA‐KNMC code

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