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Study of first orbit losses of 1 MeV tritons using the Lorentz orbit code in the LHD

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Plasma Science and Technology 2019年第2期21卷 21-25页

作者： Kunihiro OGAWA mitsutaka isobe Takeo NISHITANI Sadayoshi MURAKAMI Ryosuke SEKI Hideo NUGA Neng PU Masaki OSAKABE LHD Experiment Group National Institute for Fusion Science National Institutes of Natural Sciences SOKENDAI (The Graduate University for Advanced Studies) Kyoto University Kyoto-city

Shot-integrated measurement of the triton burnup ratio has been performed in the Large Helical Device. It was reported that the triton burnup ratio, defined as total DT neutron yield divided by total DD neutron yield, increases significantly in inward shifted configurations. To understand the magnetic configuration dependence of the triton burnup ratio, the first orbit loss fraction of 1 MeV tritons is evaluated by means of the Lorentz orbit code for various magnetic configurations. The first orbit loss of 1 MeV tritons is seen at t of less than 10-5 s and loss points of the triton are concentrated on the side of the helical coil case where the magnetic field is relatively weak. The significant decrease of the first orbit loss fraction by 15% is obtained with the inward shift of the magnetic axis position from 3.90 to 3.55 m. It is found that the decrease of first orbit loss is due to the reduction of the first orbit loss of transition and helically trapped tritons.

关键词： the Large Helical Device tritons energetic ion first orbit loss Lorentz orbit code

Measurement of Ion Cyclotron Emissions by Using High-Frequency Magnetic Probes in the LHD

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Plasma Science and Technology 2013年第3期15卷 209-212页

作者： Kenji SAITO Ryuhei KUMAZAWA Tetsuo SEKI Hiroshi KASAHARA Goro NOMURA Fujio SHIMPO Hiroe IGAMI mitsutaka isobe Kunihiro OGAWA Kazuo TOI Masaki OSAKABE Masaki NISHIURA Tsuguhiro WATANABE Satoshi YAMAMOTO Makoto ICHIMURA Takashi MUTOH National Institute for Fusion Science Graduate School of Engineering Nagoya University Institute of Advanced Energy Kyoto University Tsukuba University Plasma Research Center

Two pairs of high-frequency magnetic probes were installed in the Large Helical Device （LHD）. During the injection of a perpendicular neutral beam, ion cyclotron emissions （ICEs） with the fundamental frequency corresponding to the ion cyclotron frequency at the plasma edge were detected, which are the same type of ICE as measured with the former spare ion cyclotron range of frequencies （ICRF） heating antennas. This type of ICE was further investigated with regard to the phase and intensity of signals. Another type of ICE was found in the LHD, and these ICEs were synchronized with bursts of toroidicity induced Alfv^n eigenmodes （TAE） and the rise of intensity of lost ion flux. Therefore the source of these ICEs was thought to be the particles transferred from the core to the outer region of plasma by the TAE bursts. The frequency of ICEs induced by the TAE bursts increases linearly with the magnetic field strength, since the ion cyclotron frequency increases with the magnetic field strength.

关键词： LHD ICE TAE lost particle high-frequency magnetic probe

用于Hl-2A的快离子损失探针的探头位置设计及实现

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核电子学与探测技术 2013年第8期33卷 940-944,1010页

作者：刘艺琴华艳朱祚缤罗小兵 mitsutaka isobe 四川大学原子核科学技术研究所成都610064 核融合科学研究所

快离子损失探针可以对损失快离子的能量和pitch angle同时进行测定,是研究托卡马克装置等离子体约束输运行为的重要工具。针对HL-2A托卡马克装置上损失快离子能量和pitch angle测量范围的具体要求,对快离子损失探针的探头位置进行了选择... 详细信息

快离子损失探针可以对损失快离子的能量和pitch angle同时进行测定,是研究托卡马克装置等离子体约束输运行为的重要工具。针对HL-2A托卡马克装置上损失快离子能量和pitch angle测量范围的具体要求,对快离子损失探针的探头位置进行了选择,运用Lorentz orbit code对探头可能安装位置损失快离子的轨迹进行了计算。同时,还研制了对HL-2A装置上的损失快离子探针探头位置进行调节的平动转动系统。

关键词：氘离子轨迹 HL-2A Lorentz orbit code 托卡马克

Beam Ion Transport from Neutron Emissivity Measurement in Deuterium Neutral Beam-Heated Deuterium Plasmas of the HL-2A Tokamak

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Chinese Physics Letters 2009年第10期26卷 132-135页

作者： isobe mitsutaka 刘仪杨进蔚陈伟季小全袁国梁张轶泼邹桂青李伟雷光玖丁玄同严龙文杨青巍段旭如 OHDACHI Satoshi MORITA Shigeru TOI Kazuo National Institute for Fusion Science 322-60roshi-cho Toki 509-5292 Japan Southwestern Institute of Physics PO Box 432 Chengdu 610041

An experiment at the HL-2A tokamak with a high-energy deuterium neutral beam （NB） injection （30 keV, about 0.6 MW） was performed. The emission of d-d fusion neutrons dominated by beam-plasmas reactions when the deuterium NB was injected into the deuterium target plasma was observed by means of a ^235U fission chamber. To obtain information on NB deposition and the slowing down of beam ions in HL-2A plasmas, a very short-pulse deuterium NB injection, or the so-called ＂blip＂ injection, was performed into MHD-quiescent Ohmic deuterium plasmas. Analysis of neutron decay following the NB ＂blip＂ injection indicates that tangentially injected beam ions are well confined, slowing down classically in the HL-2A. In contrast to the MHD-quiescent plasma, anomalous losses of beam ions were observed when tearing mode instabilities were present.

关键词： sea surface nonliear interaction numerical method

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用于HL-2A的快离子损失探针系统研究

四川大学学报（自然科学版） 2013年第6期50卷 1305-1309页

作者：刘艺琴华艳朱祚缤陈伟罗小兵张轶泼刘仪機部光孝四川大学原子核科学技术研究所辐射物理及技术教育部重点实验室成都610064 核工业西南物理研究院成都610027 国家核融合科学技术研究所

闪烁快离子损失探针是聚变装置上诊断高能粒子的重要工具,可对损失离子能量和俯仰角进行同时测定.根据环流器二号(HL-2A)托卡马克装置上的具体测量要求,研制了一套可移动式的闪烁体快离子损失探针,并完成了在HL-2A上的安装和调试.该探... 详细信息

闪烁快离子损失探针是聚变装置上诊断高能粒子的重要工具,可对损失离子能量和俯仰角进行同时测定.根据环流器二号(HL-2A)托卡马克装置上的具体测量要求,研制了一套可移动式的闪烁体快离子损失探针,并完成了在HL-2A上的安装和调试.该探针系统在有中性束加热的等离子体放电情形下实现了对损失快离子的探测,采集到了损失离子图像信息.根据已取得的初步实验结果,对HL-2A装置上的快离子损失探针系统的进一步完善进行了分析讨论.

关键词：闪烁体快离子环流器二号探针