Heat and Particle Control of High-Temperature Plasmas

高温等离子体的热和粒子控制

• 批准号: 05044115
• 负责人: KURODA Tsutomu
• 金额: $ 5.76万
• 依托单位: National Institute for Fusin Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05044115/
• 关键词: fusion plasma; pump limiter; hydrogen pellet; refractory metal; rf limiter; heat and particle control; boundary plasma; plasma wall interaction; 熱・粒子制御

A toroidal belt limiter with a pumping system have been utilize to control heat and particle fluxes from high temperature plasmas in TEXTOR.It has been confirmedwith particle balance analysis that hydrogen recycling at the wall is reduced just after the pellet injection and after helium injection.High Z test limiter experiments indicated that tungsten or molybdenum accumulation occasionally takes place in L mode discharges.But it causes a deleterious effect on plasma performance in only limited cases such as in high density, ohmically heated operation etc.Observed short range in sputterd neutral Mo atoms indicates prompt redeposition of Moions.This results in low erosion rate of the surface and little penetration of impurity atoms into plasma boundary.RF biasing to a limiter head reduced density and particle flux to the limter head.However, reduction of het flux has not yet been verified in spite of an expectation from based on a theoretical consideration.Through this collaboration study, some of beneficial effects have been confirmed experimentaly for pump-limiter combined with pellet fuelling, high Z limiter materials, RF biasing to the limiter head, as is above noted.Among the results above noted, the high Z limiter study attracts a lot of worldwide interests in these days.Many new programs of high Z study have been started in several tokamaks under direct influence of this TEXTOR collaboration.In TEXTOR,a design of an advanced limiter system is stated based on the results above noted.

本文介绍了一种带抽气系统的环形带限流器，用于控制TEXTOR高温等离子体的热量和粒子通量。粒子平衡分析证实，在注入芯块和注入氦气后，壁面氢再循环减少。高Z试验限流器实验表明，在L模式放电中，偶尔会出现钨或钼的积累，但这会对高温等离子体产生有害影响。在高Z试验限流器实验中，当芯块注入氦气后，壁面氢再循环减少。在高Z试验限流器实验中，当芯块注入氦气后，壁面氢再循环减少。在高Z试验限流器实验中，当芯块注入氦气后，壁面氢再循环减少。在高Z试验限流器实验中，壁面钨或钼的积累对高温等离子体产生有害影响仅在有限的情况下，例如在高密度、欧姆加热操作等中，等离子体性能。观察到的短射程的中性Mo原子指示Mo离子的迅速再沉积。这导致表面的低侵蚀速率和杂质原子很少渗透到等离子体边界中。对限制器头部的RF偏压降低了密度和到限制器头部的粒子通量。然而，尽管基于理论考虑的期望，het通量的减少尚未得到验证。通过这项合作研究，一些有益的效果已经在实验上得到证实，如泵限制器与弹丸加料相结合，高Z限制器材料，限制器头的RF偏压，在上述研究成果中，高Z限制器的研究引起了世界各国的广泛兴趣，在TEXTOR合作的直接影响下，许多新的高Z研究计划已经在一些托卡马克装置上开始，在TEXTOR合作中，基于上述研究结果提出了一种先进的限制器系统的设计。

项目成果

Nobuaki Noda: "A Review of Recent Experiments on W and High Z Materials as Plasma-Facing Components in Magnetic Fusion Devices" 12th Internaional Conference on Plasma Surface Interactions. (招待講演).

Nobuaki Noda：“磁聚变装置中 W 和高 Z 材料作为面向等离子体组件的最新实验回顾”第 12 届国际等离子体表面相互作用会议（特邀演讲）。

Volker Philipps: "Observation of High Z Impurity Accumulation in Ohmically Heated TEXTOR Discharges" Proc.of 22th EPS Conference on Controlled Fusion and Plasma Physics. 19C PART III. 321-324 (1995)

Volker Philipps：“欧姆加热 TEXTOR 放电中高 Z 杂质积累的观察”第 22 届 EPS 受控聚变和等离子体物理会议论文集。

R.Koch: "Recent Results on Ion Cyclotron and Combined Heating of TEXTOR" Fusion Engineering and Design. 26. 103-120 (1995)

R.Koch：“离子回旋加速器和 TEXTOR 联合加热的最新结果”聚变工程和设计。

Yoshio Ueda: "Effects of Immpurities Released from High Z Test Limiter on Plasma Performance in TEXTOR" Journal of Nuclear Materials. (発行予定).

Yoshio Ueda：“高 Z 测试限制器释放的杂质对 TEXTOR 中等离子体性能的影响”核材料杂志（待出版）。

Guido Van Oost: "Influence of Different Heating Schemes on High Z Contamination from a Tungsten Test Limiter in TEXTOR" Proc.of 21th EPS Conference on Controlled Fusion and Plasma Physics. 18B Prat II. 1020-1023 (1994)

Guido Van Oost：“不同加热方案对 TEXTOR 中钨测试限制器高 Z 污染的影响”第 21 届 EPS 受控聚变和等离子体物理会议论文集。