Diamond is a promising candidate for enhancing the negative-ion surface production in the ion sources for neutral injection in fusion reactors; hence evaluation of its reactivity towards hydrogen plasma is of high importance. Single crystal and polycrystalline diamond samples were exposed in Pilot-PSI with the D⁺ flux of (4‒7)·10²⁴ m⁻²s⁻¹ and the impact energy of 7–9 eV per deuteron at different surface temperatures; under such conditions physical sputtering is negligible, however chemical sputtering is important. Net chemical sputtering yield Y = 9.7·10⁻³ at/ion at 800 °C was precisely measured ex-situ using a protective platinum mask (5 × 10 × 2 μm) deposited beforehand on a single crystal followed by the post-mortem analysis using Transmission Electron Microscopy (TEM). The structural properties of the exposed diamond surface were analyzed by Raman spectroscopy and X-ray Photoelectron Spectroscopy (XPS). Gross chemical sputtering yields were determined in-situ by means of optical emission spectroscopy of the molecular CH A-X band for several surface temperatures. A bell-shaped dependence of the erosion yield versus temperature between 400 °C and 1200 °C was observed, with a maximum yield of ∼1.5·10⁻² at/ion attained at 900 °C. The yields obtained for diamond are relatively high (0.5–1.5)·10⁻² at/ion, comparable with those of graphite. XPS analysis shows amorphization of diamond surface within 1 nm depth, in a good agreement with molecular dynamics (MD) simulation. MD was also applied to study the hydrogen impact energy threshold for erosion of [100] diamond surface at different temperatures.

金刚石是增强聚变反应堆中性注入离子源中负离子表面产量的有前途的候选人。因此，评估其对氢等离子体的反应性非常重要。单晶和多晶金刚石样品在Pilot-PSI中暴露，D ⁺通量为（4‒7）·10 ²⁴  m ^-2 s ^-1，在不同的表面温度下，每氘氘的冲击能为7–9 eV。在这种条件下，物理溅射可以忽略不计，但是化学溅射很重要。净化学溅射产量Ŷ  = 9.7·10 ^-3在800℃/离子被精确地测量非原位使用预先沉积在单晶上的保护性铂膜（5×10×2μm），然后使用透射电子显微镜（TEM）进行验尸分析。通过拉曼光谱和X射线光电子能谱（XPS）分析暴露的金刚石表面的结构性质。在几个表面温度下，通过分子CH AX谱带的光发射光谱法，就可以确定化学溅射的总产量。观察到腐蚀产量与温度在400°C至1200°C之间呈钟形关系，在900°C时离子/离子的最高产量达到〜1.5·10 ^-2 at / ion。钻石的产量相对较高（0.5–1.5）·10 ^-2原子/离子，与石墨相当。XPS分析显示金刚石表面在1 nm深度内发生非晶化，这与分子动力学（MD）模拟非常吻合。MD还用于研究在不同温度下[100]金刚石表面腐蚀的氢冲击能阈值。