The study of control of "partial" detached plasma and heat transport

“部分”脱离等离子体与热传输控制研究

• 批准号: 16540455
• 负责人: TONEGAWA Akira
• 金额: $ 2.43万
• 依托单位: Tokai University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540455/
• 关键词: partially detached plasma; divertor control; nuclear fusion; reduction of heat load; measurement of negative ions; sheet plasma; high heat flux; neutral particle control; 負イオン; 励起分子; 熱流速; ダイバータ; 核融合

The most attractive feature of the divertors has been the expected capability to create a dense and cold detached plasma with low neutral back flow to the main plasma. However, a loss of plasma pressure often only occurs along a narrow flux surface region of a few millimeters width and often occurs only near the separatrix. This partially detached plasma is produced in a narrow zone between the high and low temperature divertor regions. The partially detached plasma is a very complex phenomenon with atomic and molecular collision processes. It is difficult to control the detached and partially detached plasmas by commonly used diagnostics, such as heat loads, Langmuir probes, etc.We have developed a new way to stably maintain a detached plasma based on feedback control of the negative hydrogen ion density n_<H^-> in the linear divertor plasma simulator, TPD-SheetIV. A small amount of secondary gas puffing strongly reduced heat load of target plate Q and rapidly increased n_<H^-> in the periphery of the plasma without increased radiative and three-body recombination. The detached plasma is steadily maintained in the region of the target plate by rapidly varying gas flow ratio G so as to maximize the value of n_<H^-> and keep gas pressure P constant. The new system has achieved the goal of reducing both Q and amount of G in a detached plasma.

分离器最吸引人的特征是预期的能力可以创建一个密集和冷的分离等离子体，而中性后流向主要等离子体。但是，血浆压力的损失通常仅沿着几毫米宽度的狭窄通量表面区域发生，并且通常仅在分离物附近发生。该部分分离的血浆是在高温和低温分离区域之间的狭窄区域中产生的。部分分离的血浆是一种非常复杂的现象，具有原子和分子碰撞过程。很难通过常用的诊断，例如热负荷，Langmuir探针等来控制分离的和部分分离的等离子体。我们已经开发了一种新的方法来稳定地维持基于负氢离子密度N_ <的反馈控制的分离的等离子体。 h^ - >在线性分离等离子体模拟器中，tpd-sheetiv。在血浆的周围中，少量的二次气体膨胀可大大降低目标板Q的热负荷，并迅速增加N_ <H^ - >，而不会增加辐射和三体重组。通过迅速变化的气流比G稳定地维持分离的等离子体，以最大程度地提高N_ <H^ - >的值并保持气压P恒定。新系统实现了减少分离等离子体中Q和G量的目标。

项目成果

Control of H- Ion Density in the Sheet Plasma by an Electron Emitter

通过电子发射器控制片状等离子体中的氢离子密度

• 发表时间: 2004
• 期刊: Journal of Plasma and Fusion Research, SERIES 6
• 作者: M.Ono;et al.
• 通讯作者: et al.

Detached plasma control by negative ion in divertor simulator

在偏滤器模拟器中通过负离子控制分离等离子体

• 发表时间: 2005
• 期刊: Journal on Nuclear Materails 337・339
• 作者: M.Ono;et al.
• 通讯作者: et al.

Control of negative hydrogen ion density by the electron-emitter

通过电子发射器控制负氢离子密度

• 发表时间: 2004
• 期刊: Journal of Advanced Science 16・2
• 作者: A.Uchino;et al.
• 通讯作者: et al.

Control of the negative hydrogen ion density by the electron-emitter

通过电子发射器控制负氢离子密度

• 发表时间: 2004
• 期刊: Journal of Advanced Science 16・2
• 作者: A.Uchino;et al.
• 通讯作者: et al.

Control of H-Ion Density in the Sheet Plasma by an Electron Emitter

通过电子发射器控制片状等离子体中的氢离子密度

• 发表时间: 2004
• 期刊: Journal of Plasma and Fusion Research,SERIES 6
• 作者: M.Ono;et al.
• 通讯作者: et al.