As an important component of tokamaks,the divertor is mainly responsible for extracting heat and helium ash,and the targets of the divertor need to withstand high heat flux of 10 MW m-2 for steady-state operation.In t...As an important component of tokamaks,the divertor is mainly responsible for extracting heat and helium ash,and the targets of the divertor need to withstand high heat flux of 10 MW m-2 for steady-state operation.In this study,we proposed a new strategy,using microchannel cooling technology to remove high heat load on the targets of the divertor.The results demonstrated that the microchannel-based W/Cu flat-type mock-up successfully withstood the thermal fatigue test of 1000 cycles at 10 MW m^(-2)with cooling water of 26 l min^(-1),30°C(inlet),0.8 MPa(inlet),15 s power on and 15 s dwell time;the maximum temperature on the heat-loaded surface(W surface)of the mock-up was 493°C,which is much lower than the recrystallization temperature of W(1200°C).Moreover,no occurrence of macrocrack and‘hot spot’at the W surface,as well as no detachment of W/Cu tiles were observed during the thermal fatigue testing.These results indicate that microchannel cooling technology is an efflcient method for removing the heat load of the divertor at a low flow rate.The present study offers a promising solution to replace the monoblock design for the EAST divertor.展开更多
直下式透镜面板灯是LED灯具(面板灯)的一种,LED灯珠分布在背面,LED光经扩散板直射出来,即直下式背发光面板灯。本文概述了超薄款直下式透镜面板灯和侧发光面板灯的表面贴装技术(Surface Mount Technology,SMT)贴装工艺差异点。对直下式...直下式透镜面板灯是LED灯具(面板灯)的一种,LED灯珠分布在背面,LED光经扩散板直射出来,即直下式背发光面板灯。本文概述了超薄款直下式透镜面板灯和侧发光面板灯的表面贴装技术(Surface Mount Technology,SMT)贴装工艺差异点。对直下式透镜面板灯提出一种金属磁吸载板和台阶透镜的创新组合设计,解决了V-Cut和V穿印制电路板在加热过程中因变形导致的透镜干涉问题,提高了产品的稳定性和光学性能。旨在与同行交流提供参考。展开更多
基金financial support from the National MCF Energy R&D Program(No.2018YFE0312300)National Natural Science Foundation of China(No.51706100)+1 种基金the Natural Science Foundation of Jiangsu Province(No.BK20180477)Fundamental Research Funds for the Central Universities(No.30918011205)。
文摘As an important component of tokamaks,the divertor is mainly responsible for extracting heat and helium ash,and the targets of the divertor need to withstand high heat flux of 10 MW m-2 for steady-state operation.In this study,we proposed a new strategy,using microchannel cooling technology to remove high heat load on the targets of the divertor.The results demonstrated that the microchannel-based W/Cu flat-type mock-up successfully withstood the thermal fatigue test of 1000 cycles at 10 MW m^(-2)with cooling water of 26 l min^(-1),30°C(inlet),0.8 MPa(inlet),15 s power on and 15 s dwell time;the maximum temperature on the heat-loaded surface(W surface)of the mock-up was 493°C,which is much lower than the recrystallization temperature of W(1200°C).Moreover,no occurrence of macrocrack and‘hot spot’at the W surface,as well as no detachment of W/Cu tiles were observed during the thermal fatigue testing.These results indicate that microchannel cooling technology is an efflcient method for removing the heat load of the divertor at a low flow rate.The present study offers a promising solution to replace the monoblock design for the EAST divertor.
文摘直下式透镜面板灯是LED灯具(面板灯)的一种,LED灯珠分布在背面,LED光经扩散板直射出来,即直下式背发光面板灯。本文概述了超薄款直下式透镜面板灯和侧发光面板灯的表面贴装技术(Surface Mount Technology,SMT)贴装工艺差异点。对直下式透镜面板灯提出一种金属磁吸载板和台阶透镜的创新组合设计,解决了V-Cut和V穿印制电路板在加热过程中因变形导致的透镜干涉问题,提高了产品的稳定性和光学性能。旨在与同行交流提供参考。
