Pellet injection is a primary method for fueling the plasma in magnetic confinement devices. For that goal the knowledges of pellet ablation and deposition profiles are critical. In the present study, the pellet fueling code HPI2 was used to predict the ablation and deposition profiles of deuterium pellets injected into a typical H-mode discharge on the EAST tokamak. Pellet ablation and deposition profiles were evaluated for various pellet injection locations, with the aim at optimizing the pellet injection to obtain a deep fueling depth. In this study, we investigate the effect of the injection angle on the deposition depth of the pellet at different velocities and sizes. The ablation and deposition of the injected pellet are mainly studied at each injection position for three different injection angles: 0°, 45°, and 60°. The pellet injection on the high field side (HFS) can achieve a more ideal deposition depth than on the low field side (LFS). Among these angles, horizontal injection on the middle plane is relatively better on either the HFS or the LFS. When the injection location is 0.468 m below the middle plane on the HFS or 0.40 m above the middle plane of the LFS, it can achieve a similar deposition depth to the one of its corresponding side. When the pre-cooling effect is taken into account, the deposition depth is predicted to increase only slightly when the pellet is launched from the HFS. The findings of this study will serve as a reference for the update of pellet injection systems for the EAST tokamak.

中文翻译：

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使用 HPI2 代码模拟 EAST 托卡马克中的氘颗粒烧蚀和沉积

颗粒注射是磁约束装置中为等离子体提供燃料的主要方法。为了实现这一目标，颗粒烧蚀和沉积剖面的知识至关重要。在本研究中，使用颗粒燃料代码 HPI2 来预测注入 EAST 托卡马克典型 H 模式放电的氘颗粒的烧蚀和沉积剖面。对不同颗粒喷射位置的颗粒烧蚀和沉积剖面进行了评估，目的是优化颗粒喷射以获得较深的燃料深度。在这项研究中，我们研究了注射角度对不同速度和尺寸下颗粒沉积深度的影响。主要研究了三种不同注射角度（0°、45°和60°）的每个注射位置处注射颗粒的烧蚀和沉积。高场侧（HFS）的颗粒注射可以比低场侧（LFS）获得更理想的沉积深度。在这些角度中，无论是HFS还是LFS，中平面的水平喷射都相对较好。当注入位置位于HFS中平面下方0.468 m或LFS中平面上方0.40 m时，可以达到与其对应一侧相似的沉积深度。当考虑预冷效应时，预计当颗粒从 HFS 发射时，沉积深度仅略有增加。本研究结果将为EAST托卡马克颗粒注入系统的更新提供参考。