Fast Ion Confinement Study by Neutron Emission Rate Measurement after Short Pulse NB Injection in the Large Helical Device

被引：6

作者：

Nishitani, Takeo ^{[1
]}

Ogawa, Kunihiro ^{[1
,2
]}

Pu, Neng ^{[2
]}

Kawase, Hiroki ^{[2
]}

Murakami, Sadayoshi ^{[3
]}

Isobe, Mitsutaka ^{[1
,2
]}

Osakabe, Masaki ^{[1
,2
]}

机构：

[1] Natl Inst Nat Sci, Natl Inst Fus Sci, 322-6 Oroshi Cho, Toki, Gifu 5095292, Japan

[2] Grad Univ Adv Studies, 322-6 Oroshi Cho, Toki, Gifu 5095292, Japan

[3] Kyoto Univ, Nishigyo Ku, Kyoto 6158520, Japan

来源：

PLASMA AND FUSION RESEARCH | 2018年 / 13卷

关键词：

fast ion confinement; NB-blip; neutron intensity decay time; neutron flux monitor; slowing down model;

D O I：

10.1585/pfr.13.3402024

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The confinement of neutral beam (NB)-injected fast ions has been investigated by the neutron intensity decay time (tau(n)) after the short pulse NB injection called "NB-blip." The Large Helical Device (LHD) has five NB injectors. NBI#1, #2, and #3 are tangential direction injectors with typical energy of 180 keV. NBI#4 and #5 are perpendicular direction injectors with typical energies of 60 keV and of 80 keV, respectively. In this experiment, NBI#1, #2, #3, and #4 each with the pulse width of 40 ms are injected into different configuration plasmas with various electron densities. The tau(n) is analyzed with a 0-dimensional fast ion slowing down model. The loss of the fast ion increases significantly with decrease in the electron density. From the comparison of calculated and measured tau(n) for different plasma configurations, the fast ion confinement is worst on the outward shifted plasma of R-ax = 3.90 m. On the other hand, it seems that the fast ion confinement is best on the plasma of R-ax = 3.74 m. (C) 2018 The Japan Society of Plasma Science and Nuclear Fusion Research

引用

页数：4

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