模拟X射线材料响应的高功率脉冲离子束加速器技术

The production and diagnostics of high power ion beams (HPIB) on the FLASH Ⅱ accelerator and 200kV pulse power source were performed. By means of restraining electron beam, forming anode plasma , extracting ion beam, the HPIB of peak ion energy 500keV and peak currents 160kA with pulse width 60ns, total energy 2.8kJ, beam area ~100 cm2 and energy fluence 25 J/cm2 were obtained. The biased Faraday cup arrays and Thomson spectrometers were developed, with which the HPIB current density and ion energy spectrum were measured. At the same time, the HPIB parameters were also measured with multiple diagnostics technologies, including calorimetry, flight time method, nuclear activation techniques, etc. The HPIB energy deposition profile in samples were calculated with numerical simulation method. The thermal shock wave and impulse were also calculated. The thermal-mechanical effect of HPIB were compared with the X-ray, and the similarities and differences were described. The main parameters of HPIB equivalent to that of X-ray were also presented. The deformation and ablation mass loss of thin Aluminum samples irradiated by >10 J/cm2 HPIB were obvious. The measure results of thermal shock wave and impulse were consistent with the calculated value. These works have provided the foundation for the development of HPIB technology and its application.

用低阻抗高功率脉冲电子束加速器开展高功率脉冲离子束产生及测量技术研究，研究在强箍缩二极管中，采用反射三极管工作原理、抑制电子流和提高离子束产生效率的技术、减小阳极等离子体形成时间和产生均匀等离子体的技术、有效引出离子束的技术以及准确测量高能注量离子束参数的方法等，产生20－50J/cm2的高功率脉冲离子束。理论上分析研扛吖β事龀謇胱邮Ｄ釾射线效应的可行性，确定质子束的主要参数。在发展先进的辐射源