The HL-2A tokamak has a very closed divertor geometry, and a new infrared camera has been installed for high resolution studies of edge-localized mode (ELM) heat load onto the outer divertor targets. The characteristics of power deposition patterns on the lower outer divertor target plates during ELMs are systematically analysed with infrared thermography. The ELM energy loss is in the range of 3%–8% of the total plasma stored energy. The peak heat flux on the outer divertor targets during ELMs currently achieved in HL-2A is about 1.5–3.2MWm⁻², the wetted area is about 0.5–0.7m², and the corresponding integrated power decay length at the midplane is about 25–40mm. The rise time of the ELM power deposition is in the range of about 100μs to 400μs, and the decay time is typically 1.5 to 4 times longer than the corresponding rise time. Convective transport along open field lines during the ELM rise phase from the midplane towards the divertor targets is implied due to the correlation of parallel transport time in the scrape-off layer (SOL) and ELM power rise time. The peak ELM energy fluence is compared with those predicted by models and with experimental data from JET, ASDEX Upgrade, MAST, and COMPASS. The results, as a whole, show a good agreement.

HL-2A 托卡马克具有非常封闭的偏滤器几何结构，并且安装了新的红外摄像机，用于对外部偏滤器目标上的边缘局部模式 (ELM) 热负荷进行高分辨率研究。使用红外热像仪系统地分析了 ELM 期间下部外偏滤器靶板上的功率沉积模式的特征。ELM 能量损失在等离子体总储存能量的 3%–8% 范围内。目前在 HL-2A 中实现的 ELM 期间外偏滤器目标上的峰值热通量约为 1.5-3.2MWm ^-2，润湿面积约为 0.5-0.7m ²，中平面相应的积分功率衰减长度约为 25 –40 毫米。ELM 功率沉积的上升时间在大约 100 μ s 到 400 μ的范围内s，衰减时间通常比相应的上升时间长 1.5 到 4 倍。由于刮除层 (SOL) 中的平行传输时间和 ELM 功率上升时间的相关性，暗示了在 ELM 上升阶段从中平面到偏滤器目标的沿开放场线的对流传输。将 ELM 峰值能量注量与模型预测的能量注量以及来自 JET、ASDEX Upgrade、MAST 和 COMPASS 的实验数据进行比较。总体而言，结果显示出良好的一致性。