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Approach to steady state high performance in DD and DT plasmas with optimized shear in JET

机译:在JET中使用最佳剪切力在DD和DT等离子体中实现稳态高性能的方法

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Steady state high performance with improved core confinement and sustainable plasma edge conditions has been approached on JET in a double barrier (DB) mode. The DB mode combines an internal transport barrier of the optimized shear regime with an edge transport barrier of an ELMy H mode regime. Improved confinement with an H factor H~ITER-89 ≈ 2 has been maintained for four energy confinement times. Ion and electron temperature profiles remain peaked in the DB mode, while the density profile is broad and similar in shape to the conventional ELMy H mode profile. The energy confinement improves across the whole plasma cross-section, and the ion heat conductivity falls to the neoclassical level in the core. Particle transport studies show that impurity accumulation can be avoided in the DB mode. In DT discharges the DB mode has attained a fusion gain of Q ≈ 0.4, producing 6.8 MW of fusion power, compared with Q ≈ 0.2 in the conventional sawtoothing ELNIy H mode. The ELMs are more benign, with an amplitude an order of magnitude smaller in the DB mode. The DB mode has a high potential to improve performance in reactor relevant conditions.
机译:在JET上以双势垒(DB)模式达到了稳定的高性能,改进了的磁芯限制和可持续的等离子体边缘条件。 DB模式将优化剪切方式的内部传输屏障与ELMy H模式方式的边缘传输屏障结合在一起。 H因子H〜ITER-89≈2的改进约束已被维持了四个能量约束时间。离子和电子温度曲线在DB模式下保持峰值,而密度曲线宽且形状类似于常规ELMy H模式曲线。整个等离子体横截面的能量限制都得到改善,并且离子热导率下降到核中的新古典水平。颗粒传输研究表明,在DB模式下可以避免杂质积累。在DT放电中,DB模式的融合增益为Q≈0.4,产生6.8 MW的融合功率,而传统的锯齿状ELNIy H模式下为Q≈0.2。 ELM更具良性,在DB模式下幅度较小。 DB模式具有提高在反应堆相关条件下的性能的巨大潜力。

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