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Extension of the JT-60U plasma regimes toward the next-step experimental reactor

机译：将JT-60U等离子方案扩展到下一步实验反应器

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In order to establish the physics basis for the sustainment of the high integrated performance required in the next-step experimental reactor, JT-60U has been optimizing the discharge control scenarios of high confinement plasmas and extending the operation regimes by utilizing a variety of heating and current drive systems, including the new Electron Cyclotron Heating/Electron Cyclotron Current Drive (ECH/ECCD) system, and the W-shaped pumped divertor. For the integration, current and pressure profile controls are essential and high triangularity delta is beneficial. The range of plasma current with high values of H-factor, beta N and bootstrap fraction was extended to 1.5 MA with nearly full non-inductive current drive by Negative-ion-based Neutral Beam (N-NB) injection into the high-beta p H-mode with Edge Localized Modes (ELMy H-mode). High current drive efficiency of 1.3 x 10(19) AW(-1) m(-2) was demonstrated for N-NB. High triangularity (0.4-0.5) operation extended the long pulse (similar to 3 s) high beta N (2.5-2.7) region to low=q(95) (similar to 3) For the reversed shear (RS) mode, feedback control of neutron production rate and stored energy enabled reproducible achievement of the DT equivalent fusion gain Q(DT)(eq) > 1 and sustainment of Q(DT)(eq)similar to 0.4-0.5 for similar to 1 s. Using the RS mode and the high delta high-beta p ELMB H-mode, the high confinement region has been extended to higher T-e/T-i and also to higher density. Electron heating by Lower Hybrid Range of Frequency (LHRF) and N-NB extended the high confinement region to T-e/T-i > 1. Argon gas puffing improved confinement in the high density regime. With the W-shaped pumped divertor, the threshold heating power for the LH transition was reduced by 30% as compared with the open divertor. Using the pumped divertor, a multiple parameter feedback control including both core and divertor plasma parameters was demonstrated. [References: 47]
机译：为了建立维持下一步实验反应器所需的高综合性能的物理基础，JT-60U一直在优化高约束等离子体的放电控制方案，并通过利用多种加热和加热方式扩展了运行方式。当前的驱动系统，包括新的电子回旋加速器加热/电子回旋加速器电流驱动（ECH / ECCD）系统，以及W形抽水分流器。对于集成而言，电流和压力曲线控制是必不可少的，并且高三角形三角洲是有益的。通过将基于负离子的中性束（N-NB）注入到高β中，具有高H因子，βN和自举分数的高值等离子体电流范围扩大到1.5 MA，几乎完全无感电流驱动p具有边缘本地化模式的H模式（ELMy H模式）。 N-NB的高电流驱动效率为1.3 x 10（19）AW（-1）m（-2）。高三角（0.4-0.5）操作将长脉冲（类似于3 s）的高beta N（2.5-2.7）区域扩展到低= q（95）（类似于3）。对于反向剪切（RS）模式，反馈控制中子生产率和储能的计算实现了DT等效聚变增益Q（DT）（eq）> 1的可再现实现，并且Q（DT）（eq）的维持类似于0.4-0.5的时间约为1 s。使用RS模式和高增量高βp ELMB H模式，高限制区域已扩展到更高的T-e / T-i和更高的密度。通过较低的混合频率范围（LHRF）和N-NB进行电子加热，将高密闭区域扩展到T-e / T-i>1。氩气膨化改善了高密闭区域的密闭性。使用W形抽油式偏滤器，与敞开式偏滤器相比，LH过渡的阈值加热功率降低了30％。使用泵浦的偏滤器，演示了包括堆芯和偏滤器等离子体参数的多参数反馈控制。 [参考：47]

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