Profile control of reversed-shear current profile and high performance by combined rf current drive

通过组合射频电流驱动实现反向剪切电流分布的分布控制和高性能

• 批准号: 12490026
• 负责人: ZUSHI Hideki
• 金额: $ 8.26万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12490026/
• 关键词: fusion plasma; tokamak; current drive; energetic electrons; confinement; lower hybrid; steady sate of high performance; heat load; 核融合; プラズマ; スペクトルギャップ; 遷移現象; 低域混成波(LHW); 電子サイクロトロン共鳴(ECRH)

The purposes of this investigation are as follows;1.current drive efficiency and physics understanding by combined spectra of LHCD2.reversed-shear current profile and physics understanding by combined spectra of LHCD3.development of control methods for reversed-shear profile over the current diffusion time4.relation between the reversed shear profile and high performance, and maintenance of the high performance state over the recycling time scaleThe obtained results are as follows;It. is found for the first time that the driven current is reduced by b-directional current. drive. (ref.1-3)1.It. is found that the enhanced current drive mode, which are characterized by both suimultaineous improvement of current drive efficiency and plasma confinement, can be triggered by LHCD.(Ref.1,2,4,12)2.It is found that the density control becomes difficult for the ultra long discharge and the wall pumping plays an important. role for these difficulties.(Ref.5,10)3.New current. drive mechanism is found and possible mechanism is proposed.(Ref.11)4. The probability for the L to H transition can be introduced by the resident time after which the transition occurs.(Ref.6-9)5.ECH causes the deterioration of ion transport and electron heating by ECH does not lead the transition for ECD (ref.13 )6. The positive effect of increase in current by ECH is found, but total drive efficiency is reduced (ref.13)

本调查的目的如下；LHCD2组合光谱的电流驱动效率及物理认识。lhcd3的反剪切电流分布及其组合谱的物理认识3.反剪切电流分布在电流扩散时间上的控制方法的发展4。反向剪切剖面与高性能的关系，以及在循环时间尺度上高性能状态的维持。首次发现驱动电流被b向电流减小。开车。(ref.1-3) 1.。发现LHCD可以触发具有电流驱动效率同时提高和等离子体约束的增强电流驱动模式（参考文献1,2,4,12）。研究发现，超长流量下的密度控制变得困难，而壁泵起着重要的作用。（参考文献5、10）新的电流。发现了驱动机理，提出了可能的机理（参11）。L到H跃迁的概率可以通过跃迁发生后的停留时间来引入（参考6-9）。ECH会导致离子输运的恶化，而ECH的电子加热不会导致ECD的转变（参考文献13）6。发现了ECH增加电流的积极作用，但总驱动效率降低（参考文献13）。

项目成果

M.Sakamoto, et al.: "Recycling and wall pumping in long duration discharges on TRIAM-1M"Nuclear Fusion. Vol.42,No.1. 165-168 (2001)

M.Sakamoto 等人：“TRIAM-1M 上长时间放电中的回收和壁泵浦”核聚变。

H.Zushi, et al.: "Steady state experiments on high performance, current profile control and long sustainment of LHCD plasmas on the superconducting tokamak TRIAM-1M"18^<th> IAEA Fusion Energy Conference. IAEA-CN-77/OV5/3. (2000)

H.Zushi 等人：“超导托卡马克 TRIAM-1M 上 LHCD 等离子体的高性能、电流分布控制和长期维持的稳态实验”第 18 届 IAEA 聚变能源会议。

M.Sakamoto, et al.: "Recycling and wall pumping in long duration discharges on TRIAM-1M"18^<th> IAEA Fusion Energy Conference. (IAEA-CN-77/EXP4/26) (2000)

M.Sakamoto 等人：“TRIAM-1M 长时间放电中的回收和壁泵浦”第 18 届 IAEA 聚变能源会议。

H.Zushi, et al.: "High performance and current drive study on TRIAM-1M"Journal of Plasma and Fusion Research Series. Vol.3. 16-21 (2000)

H.Zushi 等人：“TRIAM-1M 的高性能和电流驱动研究”等离子与聚变研究系列杂志。

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. P-2.085 (2002)

K.Hanada 等人：“TRIIAM-1M 上长 LHCD 放电中高能电子迅速损失的测量”Proc。