Study on enhancement of current drive efficiency in long RF current drive plasmas

长射频电流驱动等离子体中提高电流驱动效率的研究

• 批准号: 13680559
• 负责人: HANADA Kazuaki
• 金额: $ 0.58万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13680559/
• 关键词: Tokamak; current drive; energetic electrons; confinement; thermal input; lower hybrid wave; spectrum gap

Steady state operation of tokamak is a key for the realization of cost-effective fusion power plant. TRIAM-1M (R=0.8m, a x b = 0.12 x 0.18m, B_t<8T) is positively tackled with the study of LH current drive The enhanced current drive (ECD) mode which accompanied with the improvement of energy confinement, could be observed.The direct loss of passing energetic electrons may play an essential role in reduction of current drive efficiency. Therefore, the measurements of the confinement time of energetic electrons are important.The absolute value of the prompt loss of energetic electrons was measured as the thermal input on the movable limiter located in the low field side of the plasma. In fact, the measurement was carried out in the plasma sustained by injected RF power of 65 kW and the estimated stored energy of energetic electron was about 500 J. The measured heat flux is about 0.5 kW and most of the thermal input to the movable limiter came from SOL plasma. In addition, ripple loss of energetic electron is enhanced in ECD mode.This clearly shows that the improvement of the loss of energetic electrons does not play a significant role in the enhancement of current drive efficiency.

托卡马克的稳态运行是实现具有成本效益的聚变电站的关键。 TRIAM-1M（R=0.8m，a x b = 0.12 x 0.18m，B_t<8T）通过LH电流驱动的研究得到了积极解决，可以观察到伴随着能量限制的改进的增强电流驱动（ECD）模式。通过的高能电子的直接损失可能在电流驱动效率的降低中发挥重要作用。因此，高能电子的限制时间的测量非常重要。高能电子瞬时损失的绝对值是通过位于等离子体低场侧的可移动限制器上的热输入来测量的。事实上，测量是在注入射频功率为 65 kW 的等离子体中进行的，估计高能电子的存储能量约为 500 J。测得的热通量约为 0.5 kW，可移动限制器的大部分热输入来自 SOL 等离子体。另外，在ECD模式下，高能电子的纹波损耗有所增强。这清楚地表明，高能电子损耗的改善对于电流驱动效率的提升并没有起到显着的作用。

项目成果

H.Zushi, et al.: "Overview of steady state tokamak plasma experiments on TRIAM-1M"Proc.19^<th> IAEA Fusion Energy Conference, Lyon, France, 14-19 October 2002. IAEA-CN-94. OV/4-OV/6 (2002)

H.Zushi等人：“TRIAM-1M稳态托卡马克等离子体实验概述”Proc.19^<th>IAEA聚变能源会议，法国里昂，2002年10月14-19日。IAEA-CN-94。

M.Sakamoto, et al.: "Recycling and wall pumping in long duration discharges on TRIAM-1M"Nuclear Fusion. 42・1. 165-168 (2001)

M.Sakamoto 等人：“TRIAM-1M 长时间放电中的回收和壁泵送”核聚变 42・1 (2001)。

H.Zushi, et al.: "Overview of steady state tokamak plasma experiments on TRIAM-1M"Proc. 29^<th> European Physical Society Conference on Plasma Physics and Controlled Fusion. IAEA-CN-94. OV/4-6 (2002)

H.Zushi 等人：“TRIAM-1M 稳态托卡马克等离子体实验概述”Proc。

M.Sakamoto, et al.: "Grobal particle balance and wall recycling properties of long duration discharges on TRIAM-1M"Proc. 19^<th> IAEA Fusion Energy Conference, Lyon, France, 14-19 October 2002. IAEA-CN-94. EX/P4-07 (2002)

M.Sakamoto 等人：“TRIAM-1M 上长时间放电的全局颗粒平衡和壁回收特性”Proc。

K.Hanada, et al.: "Measurement of prompt loss of energetic electrons in a long LHCD discharge on TRIAM-1M"Proc.29^<th> European Physical Society Conference on Plasma Physics and Controlled Fusion. 2.085 (2002)

K.Hanada 等人：“TRIAM-1M 上长 LHCD 放电中高能电子迅速损失的测量”Proc.29^<th>欧洲物理学会等离子体物理和受控聚变会议。