Investigation of Plasma Confirement of a Spherical Tokamak

球形托卡马克等离子体伴烧的研究

• 批准号: 05402066
• 负责人: TOYAMA Hiroshi
• 金额: $ 26.43万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (A)
• 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-05402066/
• 关键词: Spherical Tokamak; high beta; Aspect ratio; current drive; confirement; トカマク; 非円形断面; プラズマ閉じ込め

A spherical tokamak device named TST (the abbreviation of Tokyo Spherical Tokamak) had been constructed. It has been predicted theoretically that spherical tokamaks have the advantage of natural elongation, high beta, and MHD stability. We have gotten below-mentioned experimental results.1) A spherical tokamak device named TST had been constructed. A cylindrical vacuum vessel with 1.8m in diameter and 1.6m in height is employed. In the vessel, central core composed of ohmic coils and a part of toroidal coils is installed.2) A toroidal, ohmic and vertical coils had been designed and constructed. The toroidal field was 0.2 T in the center of the vacuum vessel and toroidal ripple was 2%. The flux swing of the ohmic coil was 15mVs.3) We got the plasma of 45 kA successfully. The value of plasma current is proportional to flux swing of ohmic coil and toroidal field.4) The time evolution of the shape of the plasma on a poloidal cross-section is investigated by the radiation measured with a PIN diode array. It was found that the aspect ratio reaches 1.3 at 70 mus from the start time of the discharge. The elongation was 1.8 at 90 mus from the start time of the discharge.5) We carried out a preliminary experiment on current drive due to electron gun. The electron beam of 1.7kA,1.5ms was gotten by the electron gun. It was found that the volt second consumption was reduced by factor 7.

一个名为TST（东京球形托卡马克的缩写）的球形托卡马克装置已经建成。理论上预测球形托卡马克具有自然伸长率高、β值高、MHD稳定性好等优点。我们得到了以下实验结果。1)一个名为TST的球形托卡马克装置已经建成。采用直径1.8m，高度1.6m的圆柱形真空容器。在容器内安装由欧姆线圈和部分环形线圈组成的中心铁心。2)设计并构建了环形、欧姆和垂直线圈。真空容器中心环面场为0.2 T，环面脉动为2%。欧姆线圈的磁通摆幅为15mv。3)成功获得了45 kA的等离子体。等离子体电流的大小与欧姆线圈的磁通摆幅和环形磁场成正比。4)利用PIN二极管阵列测量的辐射，研究了等离子体在极向截面上形状的时间演化。在放电开始时间70 μ m时，纵横比达到1.3。在放电开始时间90 μ m时，伸长率为1.8。5)我们进行了电子枪驱动电流的初步实验。电子枪获得了1.7kA，1.5ms的电子束。结果发现伏秒消耗降低了7倍。

项目成果

K.Hanada: "H-L Transition Caused by Imegular Probe Insertion in the JFT-2M Tokamak" Plasma Phys.Contrl.Fusion. (to be acceptted).

K.Hanada：“JFT-2M 托卡马克中不规则探针插入引起的 H-L 转变”等离子体 Phys.Contrl.Fusion。

K.Hanada: "Electron Cyclotron Heating Combined with Lower Hybrid Current Drive on WT-3" Fusion Engineering and Design. 26. 69-75 (1995)

K.Hanada：“WT-3 上的电子回旋加热与较低混合电流驱动相结合”聚变工程与设计。

H.Toyama: "Observation of burbilance suppression and transport reduction in the presence of sheard Hon" Plasma Physics and Controlled Nuclear Fusion Research. IAEA-CN-Co A-4-II-3. 575-581 (1995)

H.Toyama：“在存在剪切力的情况下观察湍流抑制和输运减少 Hon”等离子体物理和受控核聚变研究。

K.Hanada: "Heat Flow during Sawtooth Collapse in Tokamak Plasma" Journal of the Physical Society of Japan. 63. 967-978 (1994)

K.Hanada：“托卡马克等离子体锯齿塌陷期间的热流”日本物理学会杂志。

K.Hanada: "H-L Transition Coused by Irregular Probe Insertion in the JFT-2M Tokamak" Plasma Phys. Contrl. Fusion. (to be accepted).

K.Hanada：“JFT-2M 托卡马克中不规则探针插入引起的 H-L 转变”等离子体物理。