Sensitivity check of background plasma parameter during SMBI in the GAMMA 10 central-cell by 3-D Monte-Carlo simulations

Md Maidul Islam; Shinji Kobayashi; Nobuhiro Nishino; Md Shahinul Islam; Takaaki Iijima; Masayuki Yoshikawa; Junko Kohagura; Mamoru Shoji; Yousuke Nakashima

doi:10.1585/pfr.14.2403017

Sensitivity check of background plasma parameter during SMBI in the GAMMA 10 central-cell by 3-D Monte-Carlo simulations

Md Maidul Islam, Shinji Kobayashi, Nobuhiro Nishino, Md Shahinul Islam, Takaaki Iijima, Masayuki Yoshikawa, Junko Kohagura, Mamoru Shoji, Yousuke Nakashima

Research output: Contribution to journal › Article › peer-review

Abstract

The gas fueling by supersonic molecular beam injection (SMBI) has been carried out in the world largest tandem mirror device GAMMA 10 and higher plasma density has been achieved compared with conventional gas-puffing. Three-dimensional Monte-Carlo code DEGAS is applied to GAMMA 10 and the spatial distribution of neutral particle density during SMBI is investigated. σ_div is introduced as divergence angle index of the initial particle to simulate the molecular beam injected by SMBI. It is defined to be unity in the case of cosine distribution of the angular profile of launched particles. It is found that the particles are suppressed and localized in the injection point according to the reduction of divergence angle index, σ_div and well explained the GAMMA 10 SMBI experimental results at divergence angle index, σ_div = 0.33. In this paper the simulation is carried out in the different profiles of electron temperature in order to check the sensitivity of the background plasma parameter. The simulation results indicate that the penetration depth depended on the background plasma parameter, electron temperature.

Original language	English
Article number	2403017
Journal	Plasma and Fusion Research
Volume	14
Issue number	Specialissue1
DOIs	https://doi.org/10.1585/pfr.14.2403017
State	Published - 2019
Externally published	Yes

Keywords

DEGAS
GAMMA 10
High-speed camera
Laval nozzle
Neutral transport simulation
Supersonic molecular beam injection

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1585/pfr.14.2403017

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title = "Sensitivity check of background plasma parameter during SMBI in the GAMMA 10 central-cell by 3-D Monte-Carlo simulations",

abstract = "The gas fueling by supersonic molecular beam injection (SMBI) has been carried out in the world largest tandem mirror device GAMMA 10 and higher plasma density has been achieved compared with conventional gas-puffing. Three-dimensional Monte-Carlo code DEGAS is applied to GAMMA 10 and the spatial distribution of neutral particle density during SMBI is investigated. σdiv is introduced as divergence angle index of the initial particle to simulate the molecular beam injected by SMBI. It is defined to be unity in the case of cosine distribution of the angular profile of launched particles. It is found that the particles are suppressed and localized in the injection point according to the reduction of divergence angle index, σdiv and well explained the GAMMA 10 SMBI experimental results at divergence angle index, σdiv = 0.33. In this paper the simulation is carried out in the different profiles of electron temperature in order to check the sensitivity of the background plasma parameter. The simulation results indicate that the penetration depth depended on the background plasma parameter, electron temperature.",

keywords = "DEGAS, GAMMA 10, High-speed camera, Laval nozzle, Neutral transport simulation, Supersonic molecular beam injection",

author = "Islam, {Md Maidul} and Shinji Kobayashi and Nobuhiro Nishino and Islam, {Md Shahinul} and Takaaki Iijima and Masayuki Yoshikawa and Junko Kohagura and Mamoru Shoji and Yousuke Nakashima",

note = "Publisher Copyright: {\textcopyright} 2019 The Japan Society of Plasma Science and Nuclear Fusion Research.",

year = "2019",

doi = "10.1585/pfr.14.2403017",

language = "English",

volume = "14",

journal = "Plasma and Fusion Research",

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TY - JOUR

T1 - Sensitivity check of background plasma parameter during SMBI in the GAMMA 10 central-cell by 3-D Monte-Carlo simulations

AU - Islam, Md Maidul

AU - Kobayashi, Shinji

AU - Nishino, Nobuhiro

AU - Islam, Md Shahinul

AU - Iijima, Takaaki

AU - Yoshikawa, Masayuki

AU - Kohagura, Junko

AU - Shoji, Mamoru

AU - Nakashima, Yousuke

PY - 2019

Y1 - 2019

N2 - The gas fueling by supersonic molecular beam injection (SMBI) has been carried out in the world largest tandem mirror device GAMMA 10 and higher plasma density has been achieved compared with conventional gas-puffing. Three-dimensional Monte-Carlo code DEGAS is applied to GAMMA 10 and the spatial distribution of neutral particle density during SMBI is investigated. σdiv is introduced as divergence angle index of the initial particle to simulate the molecular beam injected by SMBI. It is defined to be unity in the case of cosine distribution of the angular profile of launched particles. It is found that the particles are suppressed and localized in the injection point according to the reduction of divergence angle index, σdiv and well explained the GAMMA 10 SMBI experimental results at divergence angle index, σdiv = 0.33. In this paper the simulation is carried out in the different profiles of electron temperature in order to check the sensitivity of the background plasma parameter. The simulation results indicate that the penetration depth depended on the background plasma parameter, electron temperature.

AB - The gas fueling by supersonic molecular beam injection (SMBI) has been carried out in the world largest tandem mirror device GAMMA 10 and higher plasma density has been achieved compared with conventional gas-puffing. Three-dimensional Monte-Carlo code DEGAS is applied to GAMMA 10 and the spatial distribution of neutral particle density during SMBI is investigated. σdiv is introduced as divergence angle index of the initial particle to simulate the molecular beam injected by SMBI. It is defined to be unity in the case of cosine distribution of the angular profile of launched particles. It is found that the particles are suppressed and localized in the injection point according to the reduction of divergence angle index, σdiv and well explained the GAMMA 10 SMBI experimental results at divergence angle index, σdiv = 0.33. In this paper the simulation is carried out in the different profiles of electron temperature in order to check the sensitivity of the background plasma parameter. The simulation results indicate that the penetration depth depended on the background plasma parameter, electron temperature.

KW - DEGAS

KW - GAMMA 10

KW - High-speed camera

KW - Laval nozzle

KW - Neutral transport simulation

KW - Supersonic molecular beam injection

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U2 - 10.1585/pfr.14.2403017

DO - 10.1585/pfr.14.2403017

M3 - Article

AN - SCOPUS:85063610617

SN - 1880-6821

VL - 14

JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

IS - Specialissue1

M1 - 2403017

ER -

Sensitivity check of background plasma parameter during SMBI in the GAMMA 10 central-cell by 3-D Monte-Carlo simulations

Abstract

Keywords

UN SDGs

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