The properties of a carbon ion beam accelerated by an infrared (1.05 μm), visible (0.53 μm) or ultraviolet (0.248 μm) 1 ps 150 kJ laser under conditions relevant for ion fast ignition (IFI) are numerically investigated using a particle-in-cell 2D3V code, and the feasibility of achieving the ion beam parameters required for IFI is discussed. It was found that parameters of the ion beam determining the DT fuel ignition relatively weakly depend on the laser wavelength, and that each of the considered laser drivers enables the production of an ion beam with parameters required for IFI, but only at short distances from the irradiated carbon target, no longer than ∼100 μm. At such distances, a picosecond ion beam with ‘useful’ energy >10 kJ, peak fluence >1 GJ cm⁻², peak intensity >10²¹ W cm⁻² and the mean ion energy ∼500–600 MeV is produced regardless of the laser driver wavelength. The main factors limiting the possibility of achieving the required parameters of the ion beam at larger distances are the beam angular divergence and the ion velocity dispersion. The ion acceleration is accompanied by the emission of powerful (tens of PW, tens of kJ) picosecond pulses of short-wavelength synchrotron radiation whose power and energy increases as the laser wavelength decreases. The emission of this radiation is a source of ion energy losses and significantly reduces the values of energy, fluence and intensity of the ion beam. In addition, the emitted multi-PW radiation may pose a threat to the fusion infrastructure.

使用红外 (1.05 μ m)、可见光 (0.53 μ m) 或紫外 (0.248 μ m) 1 ps 150 kJ 激光在与离子快速点火 (IFI) 相关的条件下加速的碳离子束的特性进行了数值研究。讨论了细胞内粒子 2D3V 代码，并讨论了实现 IFI 所需离子束参数的可行性。发现决定 DT 燃料点火的离子束参数相对较弱地依赖于激光波长，并且所考虑的每个激光驱动器都能够产生具有 IFI 所需参数的离子束，但仅在距离激光器很短的距离内辐照碳靶，不超过 ∼100 μ米。在这样的距离下，具有“有用”能量 >10 kJ、峰值注量 >1 GJ cm ^-2、峰值强度 >10 ²¹ W cm ^-2的皮秒离子束并且无论激光驱动器波长如何，都会产生约 500-600 MeV 的平均离子能量。限制在较远距离实现离子束所需参数的可能性的主要因素是束角发散和离子速度色散。离子加速伴随着短波长同步辐射的强大（数十 PW，数十 kJ）皮秒脉冲的发射，其功率和能量随着激光波长的减小而增加。这种辐射的发射是离子能量损失的来源，并显着降低了离子束的能量、通量和强度的值。此外，发射的多 PW 辐射可能对聚变基础设施构成威胁。