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HL-1M装置在欧姆加热条件下进行过在一次放电中注入1～4粒小弹丸加料研究。今年,在一次放电中实现了8粒氢弹丸的连续注入,并对密度分布和扰动特征以及这些特征与装置器壁再循环、弹丸大小、注入速度和间隙的关系进行了进一步的研究。实验表明器壁再循环对高密度的获得有重要的影响。在再循环很小时,发射间隙适当的条件下,HL-1M能接受8发弹丸连续注入。而再循环较高的条件下连续注入3粒φ1.0mm弹丸获得了本轮加料实验的最好参数:等离子体中心密度n_e(0)=5.3×10~(13)cm~(-3),总体储能W_p=6.0 kJ,τ_e=26ms。用CCD相机拍摄了弹丸消融云的照片,对消融过程进行了简要的分析,证实消融的不对称和弹丸轨迹的偏转是电子侧消融强于离子侧的结果,弹丸发射间隙及完整性对密度扰动有重要的影响。
The HL-1M unit was charged with 1 to 4 small pellets in a single discharge at ohmic heating. This year, continuous injection of eight hydrogen pellets was achieved in a single discharge, and the density distribution and perturbation characteristics, as well as the relationship between these characteristics and device wall recycle, projectile size, injection speed, and clearance were further studied. Experiments show that wall recirculation has a significant impact on high-density acquisition. In a small recycling, the launch gap under the appropriate conditions, HL-1M can accept eight rounds of continuous injection. In the condition of high recycle, continuous injection of three φ1.0mm projectiles obtained the best parameters of this feeding experiment: the plasma center density n_e (0) = 5.3 × 10 ~ (13) cm ~ (-3) The total energy storage W_p = 6.0 kJ, τ_e = 26ms. A photograph of the projectile ablation cloud was taken with a CCD camera and a brief analysis of the ablation process was carried out. It was confirmed that the ablation asymmetry and the projectile trajectory deflection were the result of stronger ablation on the electron side than the ion side, and the projectile emission gap and integrity perturbed the density Have a significant impact.