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Progress of Divertor Study on DEMO Design

机译：分流器对DEMO设计的研究进展

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Recent progress of the physics and engineering design study for the 8m-sized DEMO is reported. Parametric study for the divertor of the compact DEMO (a machine size ～ 5.5 m) by using the SONIC code shows that the target heat load less than 10 MW/m2 around the fusion power of ～1.5 GW and the impurity radiation fraction of more than 80%. In the 8 m sized DEMO with these parameters, the partial detachment is obtained at the outer divertor, even in the low SOL density, due to the large impurity radiation in the SOL and divertor region. The SONIC simulation shows the peak of the target heat load is 7 MW/m2. However, the peak of the ion temperature at the target is considerably high, which causes significant erosion of the target. The divertor power handling and decrease in the ion temperature have to be proceeded by the scenario development of the divertor plasma operation as well as the core plasma design and the engineering design. In the engineering study side, the tungsten monoblock target with the water cooling and the Cu-alloy cooling tube is designed. The MCNP-5 neutronics analysis shows applicability of the Cu-alloy cooling tube for the divertor unit on the high heat flux region. Also the divertor cassette with a heat removability of peak heat load of 10 MW/m2 is studied. The heat transport analysis shows the maximum temperature of 1021 ?C at the tungsten surface and 331 ?C at the Cu-alloy pipe, which are acceptable level for mechanical toughness and thermal fatigue.
机译：报告了8m大小的DEMO的物理和工程设计研究的最新进展。通过使用SONIC代码对紧凑型DEMO（机器尺寸〜5.5 m）的偏滤器进行的参数研究表明，在约1.5 GW的聚变功率附近，目标热负荷小于10 MW / m2，杂质辐射分数大于80％。在具有这些参数的8 m大小的DEMO中，由于SOL和分流器区域中的大量杂质辐射，即使在低SOL密度下，也可以在外分流器获得部分分离。 SONIC仿真显示目标热负荷的峰值为7 MW / m2。但是，靶上离子温度的峰值相当高，这导致靶的显着腐蚀。必须通过分流器等离子体操作以及核心等离子体设计和工程设计的方案开发来进行分流器功率处理和离子温度降低。在工程研究方面，设计了带有水冷和铜合金冷却管的钨单体靶。 MCNP-5中子学分析表明，铜合金冷却管在高热通量区域上适用于分流器单元。还研究了峰值热量负荷为10 MW / m2的可热移动性的分流器盒。传热分析表明，钨表面的最高温度为1021°C，铜合金管的最高温度为331°C，这对于机械韧性和热疲劳而言是可以接受的水平。

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